# Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for Piperia yadonii (Yadon's piperia)

> Briefs, arguments, decisions, and more.

URL: https://www.frixlaw.com/law-library/documents/fr%3A07-5136

## Record

- **Collection:** Federal Register
- **Document type:** Rule
- **Published:** October 24, 2007
- **Citation:** 72 FR 60410

## Text

DEPARTMENT OF THE INTERIOR
Fish and Wildlife Service
50 CFR Part 17
RIN 1018-AU34
Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for Piperia yadonii (Yadon's piperia)

AGENCY:

Fish and Wildlife Service, Interior.

ACTION:

Final rule.

SUMMARY:

We, the U.S. Fish and Wildlife Service (Service), are designating critical habitat for the endangered
Piperia yadonii
(Yadon's piperia) pursuant to the Endangered Species Act of 1973, as amended (Act). In total, approximately 2,117 acres (ac) (857 hectares (ha)) fall within the boundaries of the critical habitat designation. The critical habitat is located in Monterey County, California.

DATES:

This rule becomes effective on November 23, 2007.

ADDRESSES:

Comments and materials received, as well as supporting documentation used in the preparation of this final rule, are available for public inspection, by appointment, during normal business hours, in the branch of Endangered Species, at the Ventura Fish and Wildlife Office (VFWO), 2493 Portola Road, Suite B, Ventura, CA 93003. The final rule, economic analysis, and map are also available on the Internet at
http://www.fws.gov/ventura.

FOR FURTHER INFORMATION CONTACT:

Diane Noda, Field Supervisor, VFWO, at the above address (telephone (805) 644-1766, ext. 319; facsimile (805) 644-3958). Persons who use a telecommunications device for the deaf (TDD) may call the Federal Information Relay Service (FIRS) at 800-877-8339, 7 days a week and 24 hours a day.

SUPPLEMENTARY INFORMATION:

Background

It is our intent to discuss only those topics directly relevant to the designation of critical habitat in this rule. For more information on
Piperia yadonii
, refer to the proposed critical habitat rule published on October 18, 2006 (71 FR 61546) and the final listing rule published in the
Federal Register
on August 12, 1998 (63 FR 43100).

Previous Federal Actions

For more information on previous Federal actions concerning
Piperia yadonii
, refer to the final listing rule published in the
Federal Register
on August 12, 1998 (63 FR 43100) and proposed critical habitat rule published in the
Federal Register
on October 18, 2006 (71 FR 61546). On August 7, 2007, we published a notice announcing the availability of the draft economic analysis (DEA), and reopening of the public comment period (72 FR 44069). This comment period closed on September 6, 2007.

Summary of Comments and Recommendations

We requested written comments from the public on the proposed designation of critical habitat for
Piperia yadonii
in the proposed rule published on October 18, 2006 (71 FR 61546). We also contacted appropriate Federal, State, and local agencies; scientific organizations; and other interested parties and invited them to comment on the proposed rule. The initial comment period ended December 18, 2006. We published newspaper notices on October 26, 2006, in the
Monterey Herald,
Monterey, California, inviting public comment on the proposed critical habitat designation.

During the comment period that opened on October 18, 2006, and closed on December 18, 2006, we received 9 comments directly addressing the proposed critical habitat designation: 3 from peer reviewers, 1 from a State agency, and 5 from organizations or individuals. During the comment period that opened on August 7, 2007, and closed on September 6, 2007, we received 8 comments directly addressing the proposed critical habitat designation and the draft economic analysis. All of these latter comments were from organizations or individuals and some organizations and individuals provided comments during both comment periods. Overall, 12 commenters supported a designation of critical habitat for
P. yadonii
, and 3 commenters opposed parts of the proposed designation. All comments and new information relating to the proposed critical habitat designation for
P. yadonii
are addressed in the following summary and incorporated into the final rule as appropriate. We did not receive any requests for a public hearing.

Peer Review

In accordance with our policy published on July 1, 1994 (59 FR 34270), we solicited expert opinions from three knowledgeable individuals with scientific expertise that included familiarity with the species, the geographic region in which the species occurs, and conservation biology principles. We received responses from all three peer reviewers. The peer reviewers generally agreed that the technical information and primary constituent elements (PCEs) identified in the proposed designation were accurate and that those areas that we did propose as critical habitat should be included. However, all three peer reviewers suggested that the designation should be expanded to include additional areas and increase the size of existing units. They also provided additional information, clarifications, and suggestions to improve the final critical habitat rule and the conservation of the species. Peer reviewer comments are addressed in the following summary and incorporated into the final rule as appropriate.

We reviewed all comments received from the peer reviewers and the public for substantive issues and new information regarding critical habitat for
Piperia yadonii
, and address them in the following summary.

Peer Reviewer Comments

1.
Comment:
One peer reviewer indicated that the proposed designation emphasizes land ownership and proposed land use over biological or ecological factors in determining the size and boundaries of units. The peer reviewer replicated the process we identified in the rule and provided an analysis of six of our proposed subunits in Units 1, 2, and 3 as support for this assertion. The peer reviewer showed that those subunits that were on, or surrounded by, typical (non-conservation oriented) private lands encompassed a substantially smaller proportion of the appropriate surrounding habitat for
Piperia yadonii
than those subunits that were on, or surrounded by, lands owned by a conservation-oriented organization. The peer reviewer further stated that an unbiased designation of critical habitat could provide great conservation benefit to
P. yadonii,
as evidenced by four policies in the County of Monterey General Plan update. These policies emphasize conservation of designated critical habitat areas in evaluating and approving proposed land uses. The peer reviewer recommended that we redo the designation, focusing solely on the presence of PCEs and eliminating any bias introduced by assigning preference to a hierarchy of land ownership types.

Our Response:
Our method for designating areas as critical habitat was described in the proposed rule under the sections “Criteria Used to Identify Critical Habitat” and “Mapping” and is reiterated here. See our answer to comment 18. In determining the extent

of lands necessary to ensure the conservation and persistence of
Piperia yadonii,
we identified all areas that contain those biological and physical features essential to the conservation of the species. These lands include those that are either already protected, managed, or otherwise unencumbered by conflicting use (e.g., undeveloped County or City parks, proposed preservation areas). These populations are most likely to persist into the future and to contribute to the species' survival and recovery. We also included undeveloped Federal and State lands, then local agency and private lands with recognized resource conservation emphasis (e.g., lands owned by a conservation-oriented organization, undeveloped County or City parks), and finally other agency and private lands.

We agree that land use considerations were a factor used to delineate the boundaries of some units or subunits; however, we did not exclude from consideration any subunits based solely on land ownership. In those cases where we determined that a site had the features essential to the conservation of
Piperia yadonii,
we designated the site (e.g., Units 2b and 7). Where a site included a mix of land ownership (i.e., lands that were owned or proposed for conservation by the State and lands that were not), we typically reduced the subunit to the boundaries of the conservation-oriented lands, in an effort to minimize the designation of lands that were private or were used or proposed for activities that would not be conducive to conservation (e.g., development) while ensuring that sufficient lands were designated in each unit to enable the unit to serve its conservation function. We ensured that our designation included areas distributed throughout the geographic range of the species and encompassed the habitat variation in elevation, soil types, plant communities, and distance from the coast (inland versus coastal) present in
P. yadonii
occupied habitat.

2.
Comment:
One peer reviewer supported our inclusion of multiple subunits east of Highway 101 in the Prunedale Hills (Unit 3). The peer reviewer agreed with the Service's reasons for including these subunits (to conserve genetic variation and prevent range collapse) and further stated that the plant community at these somewhat xeric, less coastally influenced sites may be more stable in the long term, with slower rates of successional conversion to oak woodland, than those sites to the west. The peer reviewer stated that gradual, successional loss of suitable habitat may be a significant threat over the long term and suggested that, at a minimum, we scan high-resolution aerial photographs of currently occupied sites to identify and delineate regions where patches of broken canopy and scattered areas of bare ground are visible. The peer reviewer provided historical and current aerial photography of four subunits in chaparral and one subunit in Monterey pine forest to support the assertion that canopy cover throughout the range of
Piperia yadonii
has increased since the 1930s and 1940s.

Our Response:
We have considered the information the peer reviewer provided and agree that increased canopy cover in the ridgetop maritime chaparral of the Prunedale Hills may threaten
Piperia yadonii
by reducing available habitat. We discussed this in the proposed rule under the “Background” and “Special Management Considerations or Protections” sections. Although the vegetation cover in the region in which Unit 3 is designated may be increasing more slowly than in those areas to the west (in the region of Units 1 and 2), the natural lands in and around Unit 3 are also more highly fragmented and developed than those areas west of Highway 1, around Units 1 and 2. With increasing development, the opportunities to use vegetation management tools, such as prescribed fire, which both reduce the vegetation canopy and alter soil nutrient availability in ways with which the chaparral plant community has evolved, are much reduced. Given the information we currently have, that greater fragmentation exists and that known population sizes of
P. yadonii
are generally smaller as one moves east in Unit 3, we are not proposing to increase the size of the subunits in Unit 3 in an attempt to capture areas of more open canopy. We have added discussion to the description of Unit 3, recognizing the potentially slower successional changes in Unit 3, and will consider this information in making conservation recommendations for the entire Prunedale Hills area.

3.
Comment:
Two peer reviewers questioned our decision not to include in the critical habitat designation those areas where
Piperia yadonii
populations inhabit less than 5 acres and are surrounded by development. One peer reviewer stated that not including these smaller populations is not conducive to the long-term conservation of the species, because they may have large impacts on gene flow and genetic diversity and because they can provide connectivity to larger populations that we did include in the designation. The peer reviewer specifically cited areas that support the Fort Ord, Skyline Drive, and Monterey Airport populations, none of which we included in the proposal. The peer reviewer urged the Service to work with landowners and other entities to develop a coordinated conservation strategy for these smaller populations.

Our Response:
We recognize that all populations of
Piperia yadonii
may provide conservation value to the species and we indicated this in the proposed rule, as the Peer Reviewer acknowledged, by stating “* * * those populations that have become isolated as a result of development may contribute to the conservation of the species through educational, research, and other mechanisms, but overall have a lower potential for long-term preservation and lesser conservation value to the species.” We believe that small areas with surrounding development have a lower conservation value to the species because they are less likely to have and maintain the features that are essential to the conservation of the species. In general, we seek to identify the minimum amount and optimum distribution of lands that support the PCEs to designate as critical habitat. Therefore, we did not include all populations in this designation.

In determining which sites to select, we concluded that those populations that are in highly developed areas are less likely to act as intermediaries in facilitating gene flow between populations, because pollinators are less likely to successfully move through residential and commercial areas to reach these islands of native vegetation and because wind-dispersed seeds are less likely to land in areas suitable for germination in highly fragmented landscapes. Of the specific sites mentioned by the peer reviewer, the Monterey Airport property and those fragmented populations along Garden Road are surrounded by the greatest level of development. The Skyline Drive site (California Natural Diversity Database (CNDDB) element occurrence (EO) 19) is on the Monterey Peninsula where we designated the larger expanses of Monterey pine forest with larger populations of
P. yadonii
(Subunit 6a) and those smaller sites, like Crocker Grove (Subunit 6d), that include plant associations not represented elsewhere.

The Fort Ord site in Marina (CNDDB EO 9) had not been found in over a decade, when a single plant was rediscovered in 2006, while we were drafting this rule. The second, more recently discovered Fort Ord site, near the boundary of the Monterey Airport,

consists of fewer than 10 plants. We recognize that the Fort Ord sites, particularly the northern one, are geographically isolated from other concentrations of
Piperia yadonii
and, if the northern site is found to support a population, it may therefore harbor genetic diversity not found elsewhere in the range of
P. yadonii.
As further information on the genetic diversity of this species becomes available, we will evaluate it and refine our conservation strategy for
P. yadonii.
However, we cannot determine at this time that the area has the features that are essential for the conservation of the species. We recognize that designation of critical habitat may not include all of the habitat areas that may eventually be determined to be necessary for the recovery of the species. For this reason, critical habitat designations do not signal that habitat outside the designation is unimportant or may not be required for recovery. We will continue to work with landowners on the conservation of
P. yadonii
throughout its range, including in those areas that are not designated as critical habitat.

4.
Comment:
One peer reviewer indicated that there are substantial gaps in the scientific information available on the genetics, seed dispersal, plant associations, and fire ecology of
Piperia yadonii.
The peer reviewer recommended that we collect this data in order to complete the critical habitat designation and to develop management strategies for
P. yadonii.
The peer reviewer provided observations on the response of two other
Piperia
species in California to fire. In one example, a small population of
P. leptopetala
may have been substantially reduced in abundance by a chaparral fire and in the other, a chaparral fire appears to have stimulated the above-ground expression of
P. cooperi.

Our Response:
We recognize that information on many attributes of the life history, genetics, and habitat needs of
Piperia yadonii
is extremely limited. Our critical habitat designations are based on the best scientific and commercial data available at the time of the designation. As more complete information becomes available for
P. yadonii,
we will incorporate it into our recovery strategy for this species. We appreciate the information the peer reviewer provided on fire ecology and recognize that genetic research is being conducted that may influence our understanding of genetic diversity within
P. yadonii.
While we do not develop management strategies as part of the designation of critical habitat, we do consider site-specific management strategies important to the conservation of the species and work with land owners, researchers, and others, to develop and implement them as part of the recovery process.

5.
Comment:
One peer reviewer recommended that we gather more information on pollinator flight range and seed dispersal in an attempt to determine if the critical habitat units are close enough to allow gene flow between them.

Our Response:
We have contacted several research scientists who specialize in moths and have reevaluated the available literature on pollinators and seed dispersal in orchids. We believe there are no additional data available, beyond what we cited in the proposed rule, on either the seed dispersal distances of orchids or the flight distances of potential pollinators, that would allow us to determine the likelihood of gene flow between critical habitat units or subunits. While data on the flight distance of relatively large moths in the family Sphingidae (sphinx months) exist, very few data are available on the distances small moths may transport pollen. In our designation, we attempted to address the need to maintain gene flow between patches of plants that are within meters of one another. We did so by encompassing within the same subunits (e.g., in Units 1 and 2) those patches of
Piperia yadonii
plants that occur on the same ridgeline in maritime chaparral, and by encompassing multiple patches of plants within the same subunits (e.g., in Unit 6) in Monterey pine forest.

6.
Comment:
Two peer reviewers indicated that genetic diversity was not adequately considered in the criteria used to designate critical habitat. One peer reviewer suggested it could be considered a PCE, or that environmental proxies could be used in the absence of information on the spatial pattern of genetic variation in
Piperia yadonii
. One peer reviewer noted that genetic research on
P. yadonii
is underway and some results should soon be available.

Our Response:
We agree that little is known about the spatial pattern of genetic variation in
Piperia yadonii
populations, and we are aware of, and are interested in, the genetic research on
P. yadonii
being conducted. Based on the Act, PCEs are always habitat features rather than intrinsic population characteristics. Therefore, genetic diversity cannot be considered a PCE. However, in this designation, we did consider that genetic variation may be a reflection of environmental variation. We have attempted to encompass variation in habitat, as an indicator of populations that may be exposed to differing selective pressures, and therefore may have diverged genetically and represent a range of genetic variation in
P. yadonii.
As we discussed in the proposed rule under “Criteria Used to Identify Critical Habitat,” our methods included designating sites that encompass the range of elevational differences, plant communities, and soil types in which
P. yadonii
occurs.

7.
Comment:
One peer reviewer stated that the designation should be more conservation-oriented toward
Piperia yadonii
, given that the species is dependent on biological associates, such as mycorhizzal (fungal) associates, Monterey pines, and pollinators. The peer reviewer indicated that these close associations make
Piperia yadonii
more vulnerable to environmental changes, such as climate change. The peer reviewer, therefore, recommended that the rule contain larger areas and additional areas beyond what was included in the proposed designation.

Our Response:
We recognize that relatively little specific information exists on the relationship of
Piperia yadonii
to other biological associates within its habitat and the vulnerability of those associates to broad-scale environmental changes, such as forest structure changes due to pathogens or climate change. We previously funded research on
P. yadonii
's breeding system and pollinators in an effort to determine the need for, and potential vulnerability of, pollinators. This research found that
P. yadonii
requires pollinators to set seed and is, therefore, highly dependent on pollinators, and that several of the likely pollinators of
P. yadonii
in the Monterey pine forest are moth species that have broad ranges and habitat preferences. Therefore, we are less concerned about the potential for environmental changes to affect pollinators in the Monterey pine forest plant communities. We recognize that little is known about the relative importance of the various species that pollinate
P. yadonii
, and that virtually nothing is known about pollination of
P. yadonii
in maritime chaparral. Therefore we have attempted to encompass the mosaic of adjacent plant community types in which patches of
P. yadonii
occur. Recognizing that larger sized units may potentially reduce the risk to
P. yadonii
from environmental change, we have attempted to designate as critical habitat areas of sufficient size to accommodate potential environmental changes. We have included reference to climate change in the discussion of how the PCEs were derived, but have not increased the size of any units beyond what we proposed.

8.
Comment:
One peer reviewer commented that the uncertainty of
Piperia yadonii's
actual range, its patchy distribution, and expected impacts of climate change constitute sufficient justification to designate units outside
P. yadonii
's known range. The peer reviewer did not provide specific suggestions of locations that should be included.

Our Response:
While we generally agree with the rationale presented by the reviewer, we only designate critical habitat in areas outside the geographical area occupied by the species at the time of listing where the best available information indicates that these areas are essential to the conservation of the species. We have included areas throughout the range of
Piperia yadonii
within this designation, although not every population has been included. Within each portion of
P. yadonii
's range, we reviewed known locations and surrounding habitat that support the PCEs. Based on our current information, we have concluded that there are no areas outside the species' known range that are essential to the conservation of the species and that therefore should be included in the designation.

Comments From the Public

9.
Comment:
Two commenters noted the thoroughness and quality of the technical information in the background section of the proposed rule and in the discussion of the PCEs and generally supported a designation of critical habitat for
Piperia yadonii
. However, one commenter questioned why the proposed designation did not include all or part of every occurrence of
P. yadonii
. They recommended that the designation include all occurrences of
P. yadonii
and urged the Service to add suitable unoccupied habitat to the designation.

Our Response:
See response to comment 3, above.

10.
Comment:
Several commenters stated that the level of detail in the maps provided was insufficient to determine what proposed areas are included or not included in the designation, both on the Monterey Peninsula and in northern Monterey County.

Our Response:
We agree that it is often difficult to distinguish unit boundaries based on the resolution of maps published in the
Federal Register
. To provide additional clarity, we attempted to include adequate descriptions of the units in the proposed rule. We have reviewed those unit descriptions and have provided additional clarifying information to them in this final designation. For example, for units on the Peninsula, we included area names used in the environmental impact report for the Pebble Beach Company's proposed development (Monterey County 2005). The public can request more explicit maps of the designation by contacting our office using any one of the methods listed in the
FOR FURTHER INFORMATION CONTACT
section listed above.

11.
Comment:
One commenter requested that the 6-acre portion of Stevenson School campus be deleted from critical habitat Subunit 6a, on the Monterey Peninsula, because the school intends to convert the property to an athletic field for student use in the future. The commenter states that, due to the property's small size and location, this area is not essential to the conservation of
Piperia yadonii
, that enough habitat is being conserved on the Monterey Peninsula via the Pebble Beach Company's proposed mitigation for their development plan, and that the inclusion of school property in the proposed designation will have adverse impacts on the school. They provided materials describing the school and its proposed site plan.

Our Response:
As we developed the designation, we evaluated all areas on the Monterey Peninsula that support the PCEs, including the area owned by Stevenson School. The Monterey Peninsula is the center of distribution of
Piperia yadonii
and supports over 70 percent of all known plants. The Stevenson School property supports Monterey pine forest contiguous with a larger extent of Monterey pine forest encompassed within Subunit 6a. Because of its connection to other Monterey pine forest with a natural understory, we do not consider it too small to have the features that are essential to the conservation of
P. yadonii
. Although it has abundant shrub cover in some areas, in other areas it supports a more open herbaceous understory with scattered patches of
P. yadonii
(Steeck, 2007). We evaluated the materials submitted by the commenter and the potential economic costs to Stevenson School from the proposed designation in our draft economic analysis. Based on the School's proposed plans for the site, we have decided to exclude this property from the final designation of critical habitat (see Exclusions Under Section 4(b)(2) of the Act section below for more information). We are available to work with Stevenson School representatives on the conservation and recovery of
P. yadonii
and their future school development plans.

12.
Comment:
One commenter stated that critical habitat on the Pebble Beach Company's property should include only those areas designated by the Pebble Beach Company for conservation purposes. They asserted that other areas are not essential to the conservation of
P. yadonii
. They provided specific recommendations for modifications to several subunits, including excising all current and proposed roads that pass through the subunits of Unit 6.

Our Response:
We reviewed the materials submitted and grouped the requested modifications into four categories: (a) Requests to remove all current and proposed roads from the subunits of Unit 6; (b) small adjustment in boundaries where the designation appeared to extend beyond the boundaries of a proposed conservation or open space area into, or just beyond, existing roads or the golf course; (c) requests to remove areas supporting existing Monterey pine forest that the commenter indicates are “lots of record” but that Monterey County required be conserved, as mitigation, in the final environmental impact report (Monterey County 2005) for the Pebble Beach Company's proposed development; and (d) more substantial modifications, which we individually discuss in the response to Comment 13, below.

We addressed the former three categories in the following ways:

(a) Roads: The Service does not typically map critical habitat at this level of detail, due to the time involved in attempting to exclude small, linear areas that lack the PCEs and would divide polygons. Lands covered by roads or other structures that do not support the PCEs are excluded by text in the final rule, as explained in the Mapping section. We recognize that some roads currently exist, but that adjustments to their current alignments are proposed that would eliminate habitat containing the PCEs. We have excluded, under Section 4(b)(2) of the Act, proposed and existing roads in Unit 6 in recognition of the conservation agreement signed by the Service and Pebble Beach Company. This agreement and the exclusions are discussed further in the section,
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
, below. See Summary of Changes from Proposed Rule, below, for more information.

(b) We have made some adjustments to the boundary of critical habitat in Subunit 6a around the corporate yard (a proposed development parcel (Monterey County 2005)), along Congress Road near the quarry site (extension of

boundary over a road), and north of area I-1 (where a relatively recently constructed structure is visible in 2005 aerial photography).

(c) We have excluded areas within Subunits 6a and 6c, including those referred to by the Pebble Beach Company as areas F-1, J, and part of Area L, that support the PCEs of critical habitat and are identified as required mitigation areas, with some allowance for development, in the FEIR for Pebble Beach Company's proposed development (Monterey County 2005). We make these exclusions in recognition of the conservation agreement signed by the Service and Pebble Beach Company. This agreement and the exclusions are discussed further in the section,
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
, below. See Summary of Changes from Proposed Rule, below, for more information.

13.
Comment:
A commenter representing the Pebble Beach Company suggested that we consider that two areas included in Unit 6 of the proposal, Indian Village/Area L (Subunit 6c) and Area B (Subunit 6e), contain greater shrub cover or riparian habitat than
Piperia yadonii
typically prefers. They also recommended we remove a portion of Subunit 6a referred to as Area D and reduce Unit 4 (Aguajito), to encompass only the suitable low-growing maritime chaparral habitat contiguous with the existing occurrence.

Our Response:
We have retained both Area B and its adjacent forested areas in Subunit 6e, as well as part of Area L and adjacent forest (Indian Village) in subunit 6c in this designation, because they contain the PCEs for
Piperia yadonii
. We have concluded that these areas have the features that are essential to conserve
P. yadonii
. We have excluded 2 ac (0.8 ha) of Subunit 6e (Area B) and about 9 acres (4 ha) of Area L in recognition of the overall benefits that designated critical habitat areas will receive under the conservation agreement signed by the Service and the Pebble Beach Company (see the section
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
below for a discussion of this exclusion).

For Unit 4 (Aguajito), we have reviewed the habitat proposed in the subunits and have considered the unique nature of the maritime chaparral on the shale and sandstone-derived soils within a large expanse of maritime chaparral and Monterey pine forest and concluded that the subunits we are designating contain the features essential to the conservation of
P. yadonii
. However, we have excluded 49 acres of this unit in recognition of the overall benefits that Unit 4 will receive under the conservation agreement signed by the Service and the Pebble Beach Company (see the section
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
below for a discussion of this exclusion).

We have reviewed the habitat in subunit 6a, Area D, and agree with the commenter that it does not contain the features essential for the conservation of
Piperia yadonii
. We conclude that the dominance of coast live oak and open canopy with relatively few Monterey pines makes it less suitable for
P. yadonii
. Therefore, we have removed 35 ac (14 ha) of Subunit 6a that do not contain the PCEs from this final critical habitat designation. See Summary of Changes from Proposed Rule, below, for more information.

14.
Comment:
Three commenters recommended expansion of Subunit 6a to include Area F-2, about 17 acres (7 ha) in Area F3, and an additional 13 ac (5 ha) of Area PQR, as defined in the Pebble Beach Company's proposed development.

Our Response:
We did not propose or designate Areas F-2, most of F-3, or the 13 ac (5 ha) in PQR because these locations support fewer
Piperia yadonii
plants compared to other locations in the Del Monte Forest that we are designating as critical habitat. These areas are also proposed for development by the Pebble Beach Company. Although we proposed conservation area F-1 as critical habitat, it is part of the exclusion we are making in this final designation, based on the conservation agreement we have signed with the Pebble Beach Company. See the section
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
below for a discussion of this exclusion. Please also see our response to Comment 1 and 18.

15.
Comment:
One commenter suggested that the Service should expand Subunit 6b to include all of Area MNOUV, which supports one of the two largest occurrences of
Piperia yadonii
known to exist. Area MNOUV is the name given to the collective areas that support 116 acres of Monterey pine forest and are proposed for development as a golf course by the Pebble Beach Company. The commenter referred to language in our proposed designation in which we indicated that the conservation role of
P. yadonii
critical habitat units is to support viable core populations. The commenter stated that Area MNOUV supports one of two viable core populations on the Peninsula and, as such, the Service should follow its own guidelines and include it in the designation.

Our Response:
Please see our response to Comment 18 for a description of how we designated critical habitat. We recognize that Subunit 6b is just one part of the large
Piperia yadonii
population found in Area MNOUV. Area MNOUV supports one of the two largest occurrences known to exist and is distributed within the second largest expanse of Monterey pine forest known to support
P. yadonii
. However, the Service determined the area did not have the features that are essential to the conservation of the species. We determined the quantity and spatial characteristics of habitat needed for conservation, and this area was determined not to meet the definition of critical habitat. Please also see our response to Comment 1.

16.
Comment:
One commenter asked if Subunits 3b and 3c were verified to support
Piperia yadonii
.

Our Response:
According to data supplied by the California Department of Transportation (Caltrans) during the preparation of the proposed rule (Robison 2006), populations of
Piperia yadonii
in Subunits 3b and 3c were visited while in flower and were verified to support the species.

17.
Comment:
One commenter provided observations of habitat and population conditions of
Piperia yadonii
in and around Subunit 3a and suggested the designation be expanded to include a site near Subunit 3a that may contain many more
P. yadonii
than previously documented. The commenter stated that the planning process for the parcel where the population occurs did not appear to involve adequate surveys for
P. yadonii,
because the surveys were conducted during the fall. The commenter provided suggestions for protecting this site.

Our Response:
We appreciate the technical information supplied and have incorporated it into the discussion of Subunit 3a, where appropriate. The population in question near Subunit 3a should be surveyed to get a positive identification of the
Piperia
species occurring there. Because we cannot determine at this time that the area meets the definition of critical habitat, we are not designating it in this final rule. The process of designating critical habitat does not involve the creation of preserves or management strategies; however, we frequently provide conservation recommendations to local agencies, and work with Federal

agencies through the section 7 consultation process, as we promote recovery of listed species. We will consider the technical information and suggestions provided by the commenter in planning and implementing recovery for this species.

Comments Related to the Draft Economic Analysis

18.
Comment:
The Draft Economic Analysis (DEA) fails to present a baseline that describes the conditions that would exist in the absence of critical habitat designation. Specifically, NPCC commented that the DEA estimated a large portion of the costs would be incurred by the Pebble Beach Company (PBC), but PBC would incur these costs with or without designation. While the DEA “directly attributed” PBC's costs of invasive species control to designation, invasive species control provides many benefits, is required by CEQA, and was conducted in all areas, whether or not the species was present. Others commented that the DEA attributes delays to the designation that might be due to other sources.

Our Response:
The Final Economic Analysis (FEA) includes an Appendix which describes impacts expected to result because of the designation of critical habitat. That is, the Appendix presents the incremental impacts that would not be expected to occur in the absence of critical habitat. This appendix recognizes that most of the impacts quantified as coextensive impacts in the report are expected to occur regardless of the designation of critical habitat.

19.
Comment:
The DEA makes no attempt to estimate how many projects or actions would involve a Federal nexus in the 20-year analysis and that the FEA should base estimates on such a prediction.

Our Response:
Appendix A of the FEA identifies projects that involve a Federal nexus to estimate the incremental impacts of the designation apart from the coextensive impacts quantified in the DEA.

20.
Comment:
It is unlikely that the restriction on development in unit 2b is due to the proposed rule. It is also unlikely that the development in unit 2b would have been completely prevented.

Our Response:
The DEA does not attribute these impacts from lost development to the proposed rule, but describes them as impacts “coextensive” with the designation of critical habitat. The FEA includes an Appendix describing incremental impacts. As described in Appendix A, the foregone development impacts in unit 2 are not considered to be incremental impacts of the critical habitat designation. Further, in the specific case of the proposed development in unit 2b, the FEA omits most of the impact from lost development that was originally included in the DEA, as information suggests it is unlikely that the entity will be prevented from developing.

21.
Comment:
To estimate the cost of delay, the DEA solely relies on conversations with the developer and uses an interest rate of fifteen percent without explanation.

Our Response:
The DEA relied as much as possible on the County Planning and Building Department to determine what development had occurred in the past, what development was currently under review, and what development was planned for the future. The developer provided reasonable estimates of delay time. An interest rate of fifteen percent is a standard interest rate used to calculate the risk adjusted cost of capital to private developers.

22.
Comment:
The DEA estimates on page 34 and 44 costs to PBC of as much as $4.5 million associated with invasive species control. Commenter states that it is unclear how the overall $4.5 million figure was determined.

Our Response:
The DEA does not include any estimated impacts of $4.5 million as described. Total impacts to the PBC over 20 years in undiscounted dollars of invasive species removal efforts is estimated to be $0.97 million in units 4 and 5 (see page 34 of the DEA) and $2.87 million in unit 6 (see page 44 of the DEA). As cited in footnotes 92 and 104 of the DEA, impacts to the PBC are based on annual budget estimates provided by PBC.

23.
Comment:
Commenter states that the DEA does not evaluate the evidence the Stevenson School provided on the large adverse impacts to the School. The commenter also noted that DEA does not comply with the Regulatory Flexibility Act (RFA) or Small Business Regulatory Fairness Act (SBREFA) as it does not adequately analyze the impacts to the Stevenson School.

Our Response:
The FEA incorporates the previous comments made by the Stevenson School and evaluates impacts of piperia conservation on the School. Section V.F of the FEA estimates impacts to range from $0.006 million to $9.2 million (present value, three percent discount rate) as a result of possible restrictions on the implementation of the School's Master Plan. The FEA also considers the impacts to the Stevenson School in the RFA and SBREFA.

Comments from the State

24.
Comment:
The California Coastal Commission questioned why the critical habitat designation on the Monterey Peninsula did not include any areas proposed for development by the Pebble Beach Company, including that part of the Monterey pine forest that supports roughly one-third of the known population of
Piperia yadonii
and is proposed for a golf course. The Coastal Commission noted that the Service provided no biological justification for the absence of this area in the designation. They recommended that the critical habitat be redrawn to include Monterey pine forest areas on the Monterey Peninsula that support
P. yadonii
and its habitat.

Our Response:
During the process of selecting critical habitat boundaries, we determined the PCEs for the species, and identified the quantity and spatial characteristics of PCEs needed for conservation. These are the physical and biological features essential to the conservation of the species. In determining the appropriate spatial arrangement of PCEs, we identified areas where there were conflicts with development projects and assessed the likelihood of the species' persistence and recovery absent designation of those areas. We determined that there was sufficient habitat for the species conservation without these lands. Therefore, our critical habitat designation does not include Pebble Beach Company development lands.

We used a multi-step process to identify and delineate critical habitat units. First, we reviewed and mapped all known occurrences of
Piperia yadonii,
using the best available information. Next, we determined the physical and biological features essential to the conservation of the species. To do this we defined the PCEs and then determined which areas contain PCEs that are essential to the conservation of the species. We evaluated which occupied areas were most likely to contribute to the long-term persistence of the species. We focused on locations with larger occurrences in larger areas of contiguous native habitat (greater than 5 acres (2 ha), see below) that are more likely to support intact ecosystem processes and biotic assemblages, provide areas for population growth, and opportunities for colonization of adjacent areas. We then selected sites with the PCEs that: (a) Represented the geographic range of the species; (b) captured peripheral populations; (c) included the range of plant communities and soil types in which

P.

yadonii

is found; (d) encompassed the elevation range over which the species occurs; and (e) maintained the connectivity of occurrences that grow on continuous ridgelines. From these areas we selected populations are most likely to persist into the future and to contribute to the species' survival and recovery. Other areas that we determined to have the PCEs, that were not included in the proposed designation or this final designation, did not have the features that are essential to the conservation of the species. For more information on how critical habitat was determined, see Criteria Used To Identify Critical Habitat section, below.

Summary of Changes From Proposed Rule

In preparing the final critical habitat designation for
Piperia yadonii,
we reviewed and considered comments from the public and peer reviewers on the proposed designation of critical habitat published on October 18, 2006 (71 FR 61546), and public comments on the draft economic analysis published on August 7, 2007 (72 FR 44069). As a result of comments received on the proposed rule and the DEA, and a reevaluation of the proposed critical habitat boundaries, we made changes to our proposed designation, as follows:

(1) Based on exclusions under section 4(b)(2) of the Act, we reduced the size of several subunits of Unit 6 on the Monterey Peninsula and both subunits of Unit 4 (Aguajito) as discussed in responses to Comments 12 and 13 and in recognition of the development of a conservation agreement signed by the Service and the Pebble Beach Company. Collectively, this resulted in a reduction of Unit 6 from 1,059 acres (428 ha) to 920 acres (372 ha) and Unit 4 from 157 acres (63.5 ha) to 108 acres (43.7 ha). The acreages of the changes are provided in Table 2. We also excluded the Stevenson School for economic reasons. Further discussion of the conservation agreement and exclusions under the Act can be found later in this document starting with the section
Application of Section 4(a)(3) and Exclusions Under Section 4(b)(2) of the Act
.

(2) We added the names of parcels of land, where available, to the unit descriptions, to help readers understand the boundaries of the designation, given the rather low resolution of the maps. We added technical information, as discussed in the comments, to the descriptions of Unit 3.

Critical Habitat

Critical habitat is defined in section 3 of the Act as—(i) the specific areas within the geographical area occupied by a species, at the time it is listed in accordance with the Act, on which are found those physical or biological features (I) essential to the conservation of the species and (II) that may require special management considerations or protection; and (ii) specific areas outside the geographical area occupied by a species at the time it is listed, upon a determination that such areas are essential for the conservation of the species. Conservation, as defined under section 3 of the Act, means to use and the use of all methods and procedures that are necessary to bring any endangered species or threatened species to the point at which the measures provided under the Act are no longer necessary.

Critical habitat receives protection under section 7 of the Act through the prohibition against destruction or adverse modification of critical habitat with regard to actions carried out, funded, or authorized by a Federal agency. Section 7(a)(2) of the Act requires consultation on Federal actions that may affect critical habitat. The designation of critical habitat does not affect land ownership or establish a refuge, wilderness, reserve, preserve, or other conservation area. Such designation does not allow government or public access to private lands. Section 7 of the Act is a purely protective measure and does not require implementation of restoration, recovery, or enhancement measures.

To be included in a critical habitat designation, habitat within the geographical area occupied by the species must first have features that are essential to the conservation of the species. Critical habitat designations identify, to the extent known using the best scientific data available, habitat areas that provide essential life cycle needs of the species (areas on which are found the primary constituent elements, as defined at 50 CFR 424.12(b)).

Unoccupied areas can be designated as critical habitat. However, we will designate unoccupied areas only when the best available scientific data demonstrate that the conservation needs of the species require additional areas.

Section 4 of the Act requires that we designate critical habitat on the basis of the best scientific and commercial data available. Further, the Service's Policy on Information Standards Under the Endangered Species Act, published in the
Federal Register
on July 1, 1994 (59 FR 34271), and Section 515 of the Treasury and General Government Appropriations Act for Fiscal Year 2001 (Pub. L. 106-554; H.R. 5658) and the associated Information Quality Guidelines issued by the Service, provide criteria, establish procedures, and provide guidance to ensure that decisions made by the Service represent the best scientific data available. They require Service biologists to the extent consistent with the Act and with the use of the best scientific data available, to use primary and original sources of information as the basis for recommendations to designate critical habitat. When determining which areas are critical habitat, a primary source of information is generally the listing package for the species. Additional information sources may include the recovery plan for the species, articles in peer-reviewed journals, conservation plans developed by States and counties, scientific status surveys and studies, biological assessments, or other unpublished materials and expert opinion or personal knowledge. All information is used in accordance with the provisions of Section 515 of the Treasury and General Government Appropriations Act for Fiscal Year 2001 (Pub. L. 106-554; H.R. 5658) and the associated Information Quality Guidelines issued by the Service.

Habitat is often dynamic, and species may move from one area to another over time. Furthermore, we recognize that designation of critical habitat may not include all of the habitat areas that may eventually be determined to be necessary for the recovery of the species. For these reasons, critical habitat designations do not signal that habitat outside the designation is unimportant or may not be required for recovery.

Areas that support populations of
Piperia yadonii
, but are outside the critical habitat designation, will continue to be subject to conservation actions implemented under section 7(a)(1) of the Act and to the regulatory protections afforded by the section 7(a)(2) jeopardy standard, as determined on the basis of the best available information at the time of the action. Federally funded or permitted projects affecting listed species outside their designated critical habitat areas may still result in jeopardy findings in some cases. Similarly, critical habitat designations made on the basis of the best available information at the time of designation will not control the direction and substance of future recovery plans, habitat conservation plans, or other species conservation planning efforts if new information

available to these planning efforts calls for a different outcome.

Methods

As required by section 4(b)(2) of the Act, we use the best scientific data available in determining areas that contain features that are essential to the conservation of
Piperia yadonii
. This includes information from the final listing rule; data from research and survey observations published in peer-reviewed articles; reports and survey forms prepared for Federal, State, and local agencies, and private corporations; site visits; regional Geographic Information System (GIS) layers, including soil and species coverages; and data submitted to the CNDDB. We have also reviewed available information that pertains to the ecology, life history, and habitat requirements of this species. This material included information and data in peer-reviewed articles, reports of monitoring and habitat characterizations, reports submitted during section 7 consultations, the recovery plan for
P. yadonii
, and information received from local species experts. We did not designate as critical habitat any areas outside the geographical area occupied by the species at the time of listing.

The range of
Piperia yadonii
extends through Monterey County from the Las Lomas area near the Santa Cruz County border in the north to approximately 15 miles (25 kilometers) south of the Monterey Peninsula near Palo Colorado Canyon (Morgan and Ackerman 1990, 208-210; Allen 1996, unpaginated). This range has been divided into the following five geographic areas for the purposes of recovery planning efforts: (1) The Monterey Peninsula; (2) the area interior of the Monterey Peninsula; (3) northern Monterey County-Prunedale-Elkhorn; (4) the Point Lobos Ranch area; and (5) the Palo Colorado Canyon area (USFWS 2004, pp. 16-26, 50-52). We make reference to these geographic areas when describing the locations of
P. yadonii
populations and lands in this critical habitat designation.

Primary Constituent Elements

In accordance with section 3(5)(A)(i) of the Act and regulations at 50 CFR 424.12, in determining which areas to propose as critical habitat, we consider those physical or biological features (PCEs) that are essential to the conservation of the species, and within areas occupied by the species at the time of listing, that may require special management considerations or protection. These include, but are not limited to, space for individual and population growth and for normal behavior; food, water, air, light, minerals, or other nutritional or physiological requirements; cover or shelter; sites for breeding, reproduction, and rearing (or development) of offspring; and habitats that are protected from disturbance or are representative of the historic geographical and ecological distributions of a species.

The specific PCEs required for
Piperia yadonii
are derived from the biological needs of
P. yadonii
as described in the Background section of the proposed rule and below.

Space for Individual and Population Growth, Including Sites for Seed Dispersal and Germination

Piperia yadonii
depends on adequate space for growth, reproduction between near and far neighbors, and for movement of seeds via wind to unoccupied microsites within populations, to population boundaries, and to new sites. Once dispersed, seeds must settle into sites with characteristics appropriate for germination, including the presence of fungal associates necessary for post-germination development. Maritime chaparral and pine forest communities in which
P. yadonii
and its fungal symbionts occur, exhibit considerable variability in vegetation density, species composition, and unvegetated gaps such that microsites appropriate for germination and growth are distributed unevenly throughout this mosaic.

Plant communities such as maritime chaparral, Monterey pine forest, and coast live oak woodland are dynamic; in the absence of fire, maritime chaparral succeeds to oak woodland in mesic sites and to low-diversity stands of large old-age manzanitas in drier sites (Van Dyke et al. 2001). The patchy distribution of
P. yadonii
in a given forest or chaparral site in a single year is a reflection of the habitat conditions at that particular time. Habitat sites that contain the same soil characteristics and plant community may become suitable and occupied in future decades as vegetation structure changes due to shrub or tree death and growth or herbivore population sizes or movements. In the same manner, a currently occupied location may diminish in value due to these changing conditions. The mosaic of vegetation height, density, and species composition in a given area provides opportunities for gene flow between occurrences of
P. yadonii
through seed dispersal on prevailing winds, and promotes continuation of ecosystem processes, such as the biological interactions necessary to maintain forest canopy and dominant manzanita species, and pollinator assemblages.

Maintaining large and small populations of
Piperia yadonii
is essential for the long-term conservation of the species. Large occurrences of plants and those with higher densities of individuals are more likely to attract insect pollinators necessary for the production of viable seed and promote gene flow (Kunin 1997, p. 232-233) and withstand periodic extreme environmental stresses (e.g., drought, disease), and may act as important “source” populations to allow recolonization of surrounding areas following periodic extreme environmental stresses. Small populations of plants may serve as corridors for gene flow between larger populations, and may harbor greater levels of genetic diversity than predicted for their size (Lesica and Allendorf 1995, pp. 172-175).

Nutritional and Physiological Requirements, Including Light and Soil Requirements

Piperia yadonii
occurs in maritime chaparral, a coastal shrub association dominated by endemic species of manzanitas. It is most often found on ridges where exposed sandstone or decomposed granitic soils are shallow and where the dominant manzanita species are low-growing (preliminary measurements indicate an average of 6 inches (15 centimeters) tall (Graff 2006, pp. 5-6)), allowing
P. yadonii
leaves to receive filtered sun and the inflorescence to extend above the decumbent manzanita branches. In the Elkhorn-Prunedale area, the transition from the low-growing manzanitas of the ridgetops to the surrounding slopes that support deeper soils and higher vegetation canopies is often abrupt (Van Dyke
et al.
2001, p. 222).

Although
Piperia yadonii
grows among manzanitas, the specific manzanita species vary among the geographic areas within the species range. Hooker's manzanita (
Arctostyphylos hookeri
ssp.
hookeri
) is the manzanita species with which
P. yadonii
most commonly grows at its most northern distribution in the hills around Prunedale. Pajaro manzanita (
A. pajaroensis
) and chamise (
Adenostoma fasciculatum
) are other dominant shrubs in maritime chaparral there. On and south of the Monterey Peninsula, several manzanitas (
A. hookeri, A. tomentosa
, and
A. glandulosa
ssp.
zacaensis
) are reportedly the dominant shrubs among which it grows (Graff 2006, p. 4; EcoSystems West 2006, p. 64). Other species of manzanita (
A. glandulosa
) and manzanita hybrids are

the dominant low-growing forms at the southernmost occurrence of
P. yadonii
near Palo Colorado Canyon, where Hooker's manzanita is absent (Norman 1995, Graff 2006, p. 4).

In Monterey pine forest,
Piperia yadonii
grows through pine needle duff where the native herbaceous vegetation cover is typically sparse, but diverse, and the Monterey pine canopy is of moderate density (20 to 70 percent on the Monterey Peninsula), providing filtered sunlight to the forest floor (EcoSystems West 2006, pp. 43, 62-68). The understory plant species most frequently associated with
P. yadonii
in the Monterey pine forest are the perennial herb common sanicle (
Sanicula laciniata
), leafy bent grass (
Agrostis pallens
), and spindly forms of bush monkey flower (
Mimulus aurantiacus
). In a habitat characterization of
P. yadonii
on the Monterey Peninsula, microsites occupied by
P. yadonii
had five times greater cover by other native geophytes (perennial plants with underground storage organs, such as bulbs, tubers, or corms), such as golden brodiaea (
Tritelia ixiodes
), blue dicks (
Dichelostemma capitatum
), and mariposa lilies (
Calochortus
spp.) than did microsites lacking
P. yadonii
. Where a maritime chaparral understory exists with scattered pines,
P. yadonii
occurs with other native herbs in gaps between the shrubs. It occurs in similar gaps associated with trails and fire roads in the Bishop pine-Gowen cypress forest stand within the Monterey pine forest on the Monterey Peninsula. It is not typically found in areas with a coast live oak canopy or those with high understory cover of shrubs or vines (EcoSystems West 2006, pp. 50-51, 62-68).

It is likely that in some areas the composition and cover of the Monterey pine herbaceous understory may remain relatively stable for decades due to abiotic factors (e.g., soils, hydrology); in others, these appropriate microhabitats may be ephemeral, disappearing as shrubs establish or increase in size and appearing elsewhere when understory fire; burrowing, trailing, and browsing animals; or shrub death, create new gaps. Areas should be of sufficient size to sustain the plant communities in which
Piperia yadonii
grows, given that climate change may eventually alter forest composition (and thus availability of filtered sunlight), available soil moisture, and mycorrhizal associates (Perry
et al.
1990, pp. 266-274; Field
et al.
1999, pp. 1-3; Noss 2001, pp. 581-586).

Although soils supporting native mycorrhizal symbionts are believed to be a requirement for successful growth in
Piperia yadonii
, this is not a habitat feature easily observable in the field or about which we have specific information. Therefore, we have not included it as a primary constituent element for
P. yadonii
, but assume that mycorrhizal associates will be represented in areas that encompass appropriate vegetation and soils.

Piperia yadonii
occupies soils that are primarily characterized as sands, fine sands, and sandy loams by the Soil Conservation Service mapping (United States Department of Agriculture (USDA) 1978, maps; EcoSystems West 2006, pp. 23-26). Soils where
P. yadonii
occurs in the Monterey pine forest are typically characterized as sands, rather than loams and, on the Monterey Peninsula, are frequently underlain by a claypan that is 1 to 5 feet (0.3 to 1.5 m) below the surface (USDA 1978, pp. 53-54; Jones and Stokes Associates 1994b, pp. 16-21; EcoSystems West 2006, pp. 23-26)). In a comparison of Monterey pine forest sites on and east of the Monterey Peninsula,
P. yadonii
was present in soils that tended to have lower organic matter, lower nutrient levels, and lower summer soil moisture levels than areas where it was absent (EcoSystems West 2006, pp. 43, 59-61). It is not known if
P. yadonii
actually prefers nutrient-poor soils or if it is unable to compete with the denser understory vegetation found on more nutrient-rich soils. The presence of
P. yadonii
is correlated with the drier of the forest soils. It is not found in riparian areas or wetlands on the Monterey Peninsula (Allen, unpaginated; EcoSystems West 2006, pp. 59-61, 64-65).

In the maritime chaparral at its northern distributional limit,
Piperia yadonii
occurs on ridges supporting shallow, weathered, sandy soils with sandstone outcrops, where shrubs are small-statured (USDA 1978, pp. 10-11; Allen 1996 unpaginated; Graff 2006, p. 4). The average shrub canopy height in areas where
P. yadonii
occurs on these ridges is about 6 inches, according to preliminary sampling (Graff 2006, pp 5-6). Soils in this region are typically derived from weathered marine deposits. These sites often support cryptogamic soil crusts (soil surface communities primarily composed of cyanobacteria, lichens, mosses, and algae) (Graff 2006, p. 4). Cryptogamic crusts have been found to increase nutrient availability to plants, reduce erosion, improve plant-water relations, and provide germination and seedling growth sites (USDA 1997, pp. 8-11).

Pollinators

Piperia yadonii
also requires pollinators for the production of viable seeds (PCE 2) (Doak and Graff 2001, p. 15). Size and configuration of plant populations, and associated flowering species, may influence the degree to which pollinators are attracted to an area (Sipes and Tepedino 1995, p. 937). The abundance of pollinators may affect reproductive success and persistence of small plant populations (Groom 1998, pp. 487-495). As a group, the reproductive output of orchids is limited by pollinator availability or activity (Tremblay
et al.
2005, p. 24), and
P. yadonii
had reduced seed set under natural pollination as compared to manual pollination (Doak and Graff 2001, p. 12-13), an indication that seed set in this species may be pollinator limited. When populations of flowering individuals are small or flowering is restricted to a specific season, the individual plant population may not be able to sustain a population of insect pollinators by itself (Groom 1998, pp. 493-495); therefore, habitats that support a variety of other flowering plant species that provide nectar and pollen sources throughout spring and summer for pollinator populations are likely needed to sustain
P. yadonii
populations.

Doak and Graff (2001, p. 13) found that pollinators of
Piperia yadonii
are predominantly nocturnal, short-tongued moths (e.g., in the families Pyralidae, Geometridae, Noctuidae, Pterophoridae) that are most active between the hours of 8:30 p.m. and 10:00 p.m. Some of these pollinator species (e.g.,
Agrotis ipsilon, Udea profundalis
) are generalists regarding larval host plants, but others (e.g.,
Elpiste marcescaria, Drepanulatrix baueraia
) feed on specific host plants in the larval stage (e.g., coyote bush, wild lilac, respectively).
Piperia yadonii
exists within several plant communities that sustain insect pollinators. They do so by supporting those flowering plant species needed by pollinators as larval hosts or nectar sources (e.g., coyotebush, wild lilac, and species in the mint family).

Primary Constituent Elements for Piperia yadonii

Pursuant to our regulations, we are required to identify the known physical or biological features (Primary Constituent Elements; PCEs, laid out in sufficient quantity and appropriate spatial arrangement for conservation) essential to the conservation of
Piperia yadonii
. All areas being designated as critical habitat for
P. yadonii
are occupied, within the species' historic

geographic range, and contain sufficient PCEs to support life history functions for this species.

Based on our current knowledge of the life history, biology, and ecology of the species and the requirements of the habitat to sustain the essential life history functions of the species, we have determined that the
Piperia yadonii
PCEs are:

1. A vegetation structure providing filtered sunlight on sandy soils:

a. Coastal pine forest (primarily Monterey pine) with a canopy cover of 20 to 70 percent, and a sparse herbaceous understory on Baywood sands, Narlon loamy fine sands, Sheridan coarse sandy loams, Tangair fine sands, Santa Lucia shaly clay loams and Chamise shaley clay loams underlain by a hardpan; or

b. Maritime chaparral ridges with dwarfed shrubs (primarily Hooker's manzanita) on Reliz shaly clay loams, Sheridan sandy loams, Narlon sandy loams, Arnold loamy sands and soils in the Junipero-Sur complex, Rock Outcrop-Xerorthents Association, and Arnold-Santa Ynez complex often underlain by rock outcroppings.

2. Presence of nocturnal, short-tongued moths in the families Pyralidae, Geometridae, Noctuidae, and Pterophoridae.

This designation is designed for the conservation of areas supporting the PCEs necessary to support the life history functions that were the basis for the proposal. In general, critical habitat units are designated based on sufficient PCEs being present to support one or more of the species' life history functions. Each area designated in this rule has been determined to contain sufficient PCEs to provide for one or more of the life history functions of
P. yadonii
. Because not all life history functions require all the PCEs, not all critical habitat will uniformly contain all the PCEs.

Criteria Used To Identify Critical Habitat

As required by section 4(b)(2) of the Act, we used the best scientific data available in determining areas that contain features that are essential to the conservation of
Piperia yadonii
. This includes information from the final listing rule; data from research and survey observations published in peer-reviewed articles; reports and survey forms prepared for Federal, State, and local agencies, and private corporations; site visits; regional Geographic Information System (GIS) layers, including soil and species coverages; and data submitted to the California Natural Diversity Database (CNDDB). We are not designating as critical habitat any areas outside the geographical area presently occupied by the species.

We have also reviewed available information that pertains to the ecology, life history, and habitat requirements of this species. This material included information and data in peer-reviewed articles, reports of monitoring and habitat characterizations, reports submitted during section 7 consultations, our recovery plan, and information received from local species experts.

We are designating critical habitat on lands within the geographic area occupied by the species at the time of listing that continues to be occupied to date. All critical habitat units contain habitat with features essential to the conservation of
Piperia yadonii
. We did not designate any units that are unoccupied.

We used a multi-step process to identify and delineate critical habitat units. First, we mapped and reviewed all known occurrences of
Piperia yadonii
, using the best available information. To be meaningful for the purposes of determining critical habitat units, survey information had to be evaluated in light of the species' life history. Not all individuals produce leaves or flower every year. A below-ground
P. yadonii
tuber can do one of four things in any given year: Die, remain dormant, send up leaves but not flower, or leaf out and flower (Graff 2006, pp. 7 and 8). The length of tuber dormancy is not known, but may be from 1 to 4 years based upon data from other orchid species with a similar life history. The
P. yadonii
flower is diagnostic (with regard to other
Piperia
species), and the proportion of vegetative plants that flower in any given year has been estimated to be from 0.4 percent to 22 percent (Graff 2006, p. 8), with the lowest estimates coming from those in the chaparral community. Thus it is difficult to precisely determine the extent and abundance of the species both within individual occurrences and throughout its geographic range. Because a positive identification requires a flowering individual, we did not include any occurrences in the designation that had not been identified during the flowering season as
P. yadonii
.

Occurrence information included the results of several different types of surveys for the species in various locations within its range. Allen (1996, unpaginated) conducted a two-consecutive-year survey to better understand the extent of the range, distribution, and overall population size of the species. The Allen (1996) study estimated populations of
Piperia yadonii
within polygons overlaid on topographic maps, but did not indicate areas where the author looked for, but did not find occurrences. Graff (2006, e.g., pp. 14 and 15) developed a long-term monitoring program for
P. yadonii
, using specific test plots in several areas featuring known occurrences, and georeferenced individual patches of
P. yadonii
. Various other surveys were designed and conducted for specific purposes, including assessing potential land subdivisions/development projects and potential State highway realignment. In the case of Pebble Beach Company lands on the Monterey Peninsula and areas inland from the peninsula, intensive surveys have been conducted in multiple years to aid in formulating their Del Monte Forest Preservation and Development Plan.

Next, we evaluated which occupied areas were most likely to contribute to the long-term persistence of the species. We focused on locations with larger occurrences in larger areas of contiguous native habitat (greater than 5 acres (2 ha), see below) that are more likely to support intact ecosystem processes and biotic assemblages, provide areas for population growth, and opportunities for colonization of adjacent areas. These areas also have the highest likelihood of persisting through the environmental extremes that characterize California's climate and of retaining the genetic variability to withstand future introduced stressors (e.g., new diseases, pathogens, or climate change). We believe that areas less than 5 acres in size that are surrounded by high-density development (e.g., office parks, residential neighborhoods, commercial buildings, and parking lots) and have become isolated as a result of development may contribute to the conservation of the species through educational, research, and other mechanisms, but overall have a lower potential for long-term preservation and lesser conservation value to the species. Therefore, we do not believe these areas have the features essential to the conservation of the species and thus we did not further consider these areas in the designation. Although we have not included these areas within the critical habitat designation, because they are occupied they may still receive protection under other provisions of the Act.

We then selected sites from among the data set resulting from the above evaluation that contain the features essential to the conservation of Piperia yadonii, and may require special management considerations or

protection. These areas result in a designation that: (a) Represents the geographic range of the species; (b) captures peripheral populations; (c) includes the range of plant communities and soil types in which
P. yadonii
is found; (d) encompasses the elevation range over which the species occurs; and (e) maintains the connectivity of occurrences that grow on continuous ridgelines.

Species and plant communities that are protected across their ranges are expected to have lower likelihoods of extinction (Soule and Simberloff 1986; Scott
et al.
2001, pp.1297-1300); therefore, essential habitat should include multiple locations across the entire range of the species to prevent range collapse. Protecting peripheral or isolated populations is highly desirable because they may contain genetic variation not found in core populations. The genetic variation results from the effects of population isolation and adaptation to locally distinct environments (Lesica and Allendorf 1995, pp. 754-757; Fraser 2000, pp. 49-51; Hamrick and Godt, pp. 291-295). We also sought to include the range of plant communities, soil types, and elevational gradients in which
Piperia yadonii
is found to preserve the genetic variation that may result from adaptation to local environmental conditions, as documented in other plant species (e.g., see Hamrick and Godt pp. 299-301; Millar and Libby 1991 pp. 150, 152-155). Finally, habitat fragmentation can result in loss of genetic variation (Young
et al.
1996, pp. 413-417); therefore, we sought to maintain connectivity between patches of plants distributed along ridgetops.

In determining the extent of lands necessary to ensure the conservation and persistence of this species, we identified all areas that contain PCEs and are either already protected, managed, or otherwise unencumbered by conflicting use (e.g., undeveloped County or City parks, proposed preservation areas). These populations are most likely to persist into the future and to contribute to the species' survival and recovery. We added ownership categories to the designation in the following manner: First we included undeveloped Federal and State lands, then local agency and private lands with recognized resource conservation emphasis (e.g., lands owned by a conservation-oriented organization, undeveloped County or City parks), and finally other agency and private lands.

As a result of the above process, we did not include all occupied areas in the critical habitat designation. About 13 occurrences or parts of occurrences, beyond those in the Pebble Beach Company's proposed development areas, are known to the Service and are not included in the critical habitat designation: Two of these are in the Elkhorn-Prunedale area, 10 are on the Monterey Peninsula or interior of the Monterey Peninsula, and one is in the Point Lobos Ranch area. These occurrences were not included in the designation due to the above-discussed reasons of small size, lack of surrounding native or appropriate habitat, or because we lacked evidence that
Piperia yadonii
are extant or accurately identified in those areas.

Mapping

To map the units of critical habitat, we overlaid
Piperia yadonii
records on soil series data, topographic contours and, where available, vegetation data (e.g., maritime chaparral mapped by Van Dyke and Holl (2003)). Although
P. yadonii
occurs predominately on soils with a substantial sand component (e.g., Arnold and Narlon series), the mapped distribution of such soils extends well beyond the species' range.
Piperia yadonii
also frequently occurs in areas of relatively low relief (typically less than 30 percent slope) along ridgetops or in patches of low relief amid steeper slopes. Using digital elevation data, we mapped the distribution of
P. yadonii
relative to areas with low relief and found that topographic relief, when combined with soils and plant community data, is a more accurate predictor of the species' distribution. Therefore, as a first step, we tailored unit boundaries using geomorphologic features, vegetation data, and soil series data.

In areas dominated by maritime chaparral, such as the Elkhorn-Prunedale area,
Piperia-yadonii
occurs primarily among low-growing manzanitas on ridgelines underlain by sandstone. In areas with this geomorphic setting, we determined that digitizing the centerline of the ridgetops where
P. yadonii
occurs and adding 150 meters (492 feet) on either side of the centerline most consistently encompassed known
P. yadonii
occurrences, appropriate soils, and suitable habitat contiguous with known occurrences. The resulting 300 meter-(984 foot-) wide area encompasses the flat or gently sloping ridgetops with low-growing manzanitas and the adjacent slopes supporting maritime chaparral. These ridgetops support the
P. yadonii
occurrences, areas for population expansion, germination sites for wind-dispersed seeds, and appropriate soils. When maritime chaparral did not extend 150 meters from the centerline of the ridgetop, we used closer geographic (e.g., streams) and manmade features (e.g., roads, development boundaries, farmed land) to constrain and more accurately delineate a unit area boundary.

In areas dominated by Monterey pine forest, particularly on the Monterey Peninsula, topographic features are less distinct, and consequently less useful for mapping purposes than in the chaparral-covered hills of northern Monterey County. The Monterey Peninsula's Monterey pine and Gowen cypress-Bishop pine forest stands exist in an expanse of residential and recreational development. Additional residential and recreational development is proposed. As a consequence, on the Monterey Peninsula, we began by delineating the occurrences as defined by the most recent set of comprehensive surveys. We then encompassed the forested stands and fragments that were within existing or proposed conservation or open space areas. In two locations where forest connections still existed between forest stands, we included these to help maintain continued gene flow between
Piperia yadonii
occurrences. We also used landscape features such as streams, roads, and developed areas to delineate unit boundaries on appropriate soils.

Using the above criteria we identified eight units that contain features essential to the conservation of
Piperia yadonii:
Three units are in north Monterey County in the Elkhorn-Prunedale area; one is on the Monterey Peninsula; two units are interior from the Monterey Peninsula; one unit is at Point Lobos Ranch; and the most southerly unit is near Palo Colorado Canyon.

When determining critical habitat boundaries, we made every effort to avoid including within the boundaries of the maps contained within this rule developed areas, tilled fields, row crops, golf course turfgrass, buildings, paved areas, and other areas that lack PCEs for
Piperia yadonii
. The scale of the maps prepared under the parameters for publication within the Code of Federal Regulations may not reflect the exclusion of all such developed areas. Any such structures and the land under them inadvertently left inside critical habitat boundaries shown on the maps of this designation have been excluded by text in the rule and are not included in the designation as critical habitat. Therefore, Federal actions limited to these structures and underlying lands would not trigger section 7 consultation, unless they affect the species and/or primary constituent elements in adjacent critical habitat.

Special Management Considerations or Protections

When designating critical habitat, we assess whether the occupied areas contain the features essential to the conservation of the species that may require special management considerations or protection. Many of the known occurrences of
Piperia yadonii
are threatened by one or a combination of the following: habitat fragmentation or loss due to residential, commercial, or recreational development; competition with nonnative plants for light, space, or water; deer and rabbit herbivory; vegetation cutting for fire prevention; changes in light, space, and soil moisture availability due to loss or alteration of adjacent vegetation or forest canopy; changes in fecundity (number and viability of offspring) or genetic variability resulting from loss and fragmentation of populations or potentially low pollinator abundance or activity; disease; and trampling (PCE 1, PCE 2). In maritime chaparral associations of the Prunedale-Elkhorn region where fire has not occurred in many decades, shrub diversity appears to be declining as coast live oak or large-canopied manzanitas become dominant (Van Dyke et al. 2001, pp. 225-227). This conversion may be slow in the shallow ridgetop soils where
P. yadonii
occurs, but increasing development surrounding these ridgetops reduces the opportunity to use fire as a management tool should it be deemed necessary to maintain the open, low-canopy conditions of
P. yadonii
's preferred habitat (PCE 1). These threats may require special management and are addressed under the critical habitat unit descriptions below.

Critical Habitat Designation

We are designating eight units as critical habitat for
Piperia yadonii
. The critical habitat areas described below constitute our best assessment currently of areas that meet the definition of critical habitat for
Piperia yadonii
. Table 1, below, identifies the approximate area exempt from critical habitat for
P. yadonii
pursuant to section 4(a)(3) of the Act. Exemptions are discussed later in this rule under the section
Application of Section 4(a)(3) and Exclusions Under Section 4(b)(2) of the Act.
Table 2, below, identifies units that we reduced in size between the proposed and final rules.

Table 1.—Approximate Area Exempt From Critical Habitat for Piperia yadonii
Pursuant to Section 4(a)(3) of the Act

Location (Unit)

Size of area meeting the definition of critical habitat
(Acres/Hectares)

Size of exemption area
(Acres/Hectares)

Presidio of Monterey, Monterey Peninsula
121 ac (49 ha)
121 ac (49 ha)

Table 2.—Reductions in the Unit Size By Type of Land Between the Proposed and Final Rule
[Only the unit that was reduced is shown. Area estimates reflect all land within critical habitat unit boundaries in ac (ha).]

Critical habitat unit and subunit
State

Local
agency

Private

Total
reduction

Unit 4: Aguajito
0
0
49 (20)
49 (20)

Subunit 4a
0
0
28 (11)
28 (11)

Subunit 4b
0
0
21 (9)
21 (9)

Unit 6: Monterey Peninsula
0
0
139 (57)
139 (57)

Subunit 6a
0
0
95 (38)
95 (38)

Subunit 6b
0
0
3 (1)
3 (1)

Subunit 6c
0
0
39 (16)
39 (16)

Subunit 6d
0
0
0
0

Subunit 6e
0
0
2 (1)
2 (1)

Total

189 (75)

The approximate area encompassed within each designated critical habitat unit is shown in table 3.

Table 3.—Critical Habitat Units Designated for Piperia yadonii by Type of Land Ownership
[Area estimates reflect all land within critical habitat unit boundaries in ac (ha).]

Critical habitat unit and subunit
State
Local agency
Private

Conservation-
oriented NGO

Other
(private)

Total

Unit 1: Blohm Ranch

128 (52)

subunit 1a
0
0
72 (29)
0
72 (29)

subunit 1b
0
0
56 (23)
0
56 (23)

Unit 2: Manzanita Park

497 (201)

subunit 2a
0
0
231 (93)
0
231 (93)

subunit 2b
0
0
0
83 (34)
83 (34)

subunit 2c
0
183 (74)
0
0
183 (74)

Unit 3: Vierra Canyon

50 (20)

subunit 3a
0
0
0
17 (7)
17 (7)

subunit 3b
12 (5)
0
0
0
12 (5)

subunit 3c
21 (8)
0
0
0
21 (8)

Unit 4: Aguajito

108 (44)

subunit 4a
0
0
0
49 (20)
49 (20)

subunit 4b
0
0
0
59 (24)
59 (24)

Unit 5: Old Capitol
0
0
0
16 (6)
16 (6)

Unit 6: Monterey Peninsula

920 (372)

subunit 6a
0
0
435 (176)
375 (152)
810 (328)

subunit 6b
0
0
0
6 (2)
6 (2)

subunit 6c
0
0
23 (9)
8 (3)
31 (13)

subunit 6d
0
0
12 (5)
0
12 (5)

subunit 6e
0
19 (8)
29 (12)
13 (5)
61 (25)

Unit 7: Point Lobos
228 (93)
0
97 (39)
0
325 (131)

Unit 8: Palo Colorado
0
0
0
73 (29)
73 (29)

Total
261 (105)
202 (81)
955 (387)
699 (283)
2117 (857)

We present brief descriptions of all units, and reasons why they meet the definition of critical habitat for
Piperia yadonii,
below.

Unit 1: Blohm Ranch

Unit 1 consists of 128 ac (52 ha) of private lands in northern Monterey County in the Elkhorn Slough watershed. It is divided into two ridgeline subunits, separated by intervening agricultural fields. The two subunits support similar plant communities and need similar types of special management considerations or protection; therefore, we discuss them as a unit, except to define land ownership or acreage. Unit 1 was occupied at the time of listing (Service 1998) and is currently occupied. It supports one of the two largest occurrences of
Piperia yadonii
plants in the Prunedale Elkhorn area (several thousand plants (Allen 1996 unpaginated)) and the northernmost occurrences in the known range of the species. This unit contains features that are essential for the conservation of
P. yadonii
, including soils from weathered marine sediments that are classified as an Arnold Santa Ynez complex on the ridgetops and as Arnold series soils on the slopes (PCE 1). Vegetation is primarily high quality maritime chaparral, with ridgetops dominated by low-growing Hooker's manzanita. This unit provides habitat that supports germination, growth, and reproduction of
P. yadonii.
It contains ridgetop habitat openings, between and among patches of
P. yadonii
, to allow for population expansion and for shifts in population location, should successional vegetation or other changes occur that alter microhabitat conditions. Features essential to the conservation of
P. yadonii
in this unit may require special management considerations or protection due to: the growth and spread of invasive plant species (such as jubata grass); erosion from old roadbeds or past earth-moving activities; and herbivory (PCE 1, PCE 2). Herbivory of flowering stalks was 36 percent in 1999, although predators (mountain lion (
Puma concolor
)) of herbivores were recently sighted on these lands (Doak and Graff 2001, p. 28; Graff 2006, Appendix IV). Given that pollen deposition rates and seed production were low for the one site studied in this unit, special management may also be needed to ensure that the abundance of potential pollinators, such as moths or bees, are maintained or enhanced PCE 2).

Subunit 1a: This subunit consists of 72 ac (29 ha) of private land owned by the Elkhorn Slough Foundation and The Nature Conservancy. Although restoration and removal of nonnative invasive plant populations are ongoing, a management plan specifically addressing
Piperia yadonii
on properties owned by the Elkhorn Slough Foundation and The Nature Conservancy has not yet been developed (Hayes 2006).

Subunit 1b: This subunit consists of 56 ac (23 ha) of land owned by The Nature Conservancy and managed by the Elkhorn Slough Foundation, or owned and managed by the Elkhorn Slough Foundation. A management plan specifically addressing
Piperia yadonii
has not yet been developed.

Unit 2: Manzanita Park

Unit 2 consists of 498 ac (201 ha) of Monterey County lands north of Prunedale. It is divided into 3 subunits that support similar soils and vegetation communities and need similar types of special management considerations or protection; therefore, we discuss these characteristics for the whole unit. Unit 2 was occupied at the time of listing (Service 1998) and is currently occupied. The lands in this unit support several thousand
Piperia yadonii
plants scattered along the ridges, separated by intervening lower-elevation areas of oak woodland, farmed lands, and residential development (Allen 1996 unpaginated; Environmental Science Associates 2003; CNDDB 2005; Graff 2006 appendix IV). This unit contains features that are essential for the conservation of
P. yadonii,
including soils from weathered marine sediments that are classified as an Arnold-Santa Ynez complex on the ridgetops and as Arnold series soils on the slopes and on more undulating topography within Manzanita County Park (PCE 1). Vegetation within the subunits is primarily maritime chaparral, with some coast live oak woodland at the lower elevations. The ridgetops are dominated by low-growing Hooker's manzanita. This unit contains the PCEs for
P. yadonii
that promote germination, growth, and reproduction (PCE 1). This unit encompasses a cluster of three ridgelines primarily oriented east-west that rise in elevation from west to east, which support
P. yadonii
and which may be close enough for genetic exchange via wind-dispersed seed. In conjunction with the Blohm Ranch unit (Unit 1), this unit encompasses the majority of the

P.

yadonii

plants known in the northern half of the range of
P. yadonii.
The ridgetop habitat openings, between and among patches of
P. yadonii
, allow for population expansion and for shifts in population location, should successional vegetation or other changes occur that alter microhabitat conditions. This unit is the central of the three in the Elkhorn Prunedale geographic area. This unit supports one of the two largest occurrences in the species' northern range, and the subunits of Unit 2 include the largest occupied ridgelines relatively unfragmented by residential development in the heart of the species' northern distribution. Due to their relatively unfragmented condition, lands in this unit may support dormant plants among the patches of currently known
P. yadonii.
Features in this unit may require special management considerations or protection due to: the growth and spread of invasive plant species, such as jubata grass, French broom, and eucalyptus; elimination or further fragmentation of habitat from residential, recreational, or agricultural development; vegetation removal for fuel reduction purposes; disease; and herbivory (PCE 1, PCE 2). Habitat with features essential to the conservation of
P. yadonii
in this unit may require special management considerations or protection to ensure the abundance of potential pollinators, such as moths or bees, are maintained or enhanced, to ensure the production of sufficient viable seed (PCE 2).

Subunit 2a: This subunit consists of 231 ac (93 ha) of land owned and managed by the Elkhorn Slough Foundation.

Subunit 2b: This subunit consists of 83 ac (34 ha) of private lands. Some of the lands in this subunit were proposed for a 10-lot subdivision, residential development, and open space designation in 2000 (Mercurio 2000, p. 2); this project may be moving forward in the near future (Schubert 2006).

Subunit 2c: This subunit consists of 183 ac (74 ha) within Manzanita County Park, owned and managed by the County of Monterey. Part of the park has been developed into a sports complex and is not part of the designation. A portion of the park within the unit is used for hiking and equestrian use. Although volunteers have recently begun removing nonnative invasive plants from the park, we are not aware of the existence of any management plan that specifically addresses
Piperia yadonii
on properties owned by Monterey County.

Unit 3: Vierra Canyon

Unit 3 consists of 50 ac (20 ha) consisting primarily of State lands in northern Monterey County north of Prunedale. It is divided into 3 subunits with similarities in vegetation and special management considerations or protection needs. Unit 3 was occupied at the time of listing (Service 1998) and is currently occupied (Childs 2004). The easternmost
Piperia yadonii
occurrences in unit 3 (subunits 3b and 3c) are reported to be small, with fewer than 10 flowering individuals; this likely represents up to several hundred individuals, based on the observed proportion of flowering to vegetative individuals (Doak and Graff 2001). This unit contains features that are essential for the conservation of
P. yadonii
, including the following: Lands in this unit support soils from weathered marine sediments that are classified as an Arnold-Santa Ynez complex on the ridgetops and the Arnold series on the slopes (PCE 1). Vegetation is primarily maritime chaparral, with coast live oak woodland in the lower elevation areas. The ridgetops are dominated by low-growing Hooker's manzanita. Analysis of aerial photographs suggests that chaparral vegetation on the ridgetops in this region maintains a more open canopy than in areas to the west, in the areas of Units 1 and 2 (Van Dyke 2006). Therefore, these areas may support openings that are more persistent, and can be occupied by
P. yadonii
for a longer time, than areas to the west, even in the absence of fire (Van Dyke 2006). The lands surrounding these subunits are more extensively developed for residential use than are those to the west, severing the once continuous maritime chaparral that dominated the ridges. Consequently the subunits are smaller and lack the additional habitat for population expansion found in the other northern units. This unit contains the PCEs for
P. yadonii
that promote germination, growth, and reproduction. It supports the easternmost occurrences of
P. yadonii
in the Elkhorn'Prunedale region, on the northeast periphery of the species' range. Features essential to the conservation of
P. yadonii
in this unit may require special management considerations or protection due to elimination or further fragmentation of habitat from development, grading or other vegetation removal (e.g., for fuel reduction purposes or roads), and the spread of invasive plant species (PCE 1, PCE 2).

Subunit 3a: This subunit consists of 17 ac (7 ha) of private lands that are overlain by a Pacific Gas and Electric Company easement. The occurrence in this subunit is the largest documented in Unit 3, numbering several thousand plants (Childs 2004).

Subunit 3b: This subunit consists of 12 ac (5 ha) of State lands (California Department of Transportation (Caltrans)). The lands in this subunit and in subunit 3c were part of a previous study area for a highway alignment. This alignment was eventually excluded from further consideration and the State retains the lands (Robison 2006). We are not aware of any management plan that addresses
Piperia yadonii
on these State properties.

Subunit 3c: This subunit consists of 21 ac (8 ha) of State lands, owned by Caltrans.

Unit 4: Aguajito

Unit 4 consists of 108 ac (44 ha) of private land east of the Monterey Peninsula and north of Jack's Peak County Park. It is divided into 2 subunits separated by lower elevation lands. Unit 4 was occupied at the time of listing (Service 1998) and is currently occupied.
Piperia yadonii
occurs in these subunits on ridgetops, where it grows with Hooker's manzanita (EcoSystems West 2006, p. 61). This unit contains features that are essential for the conservation of
P. yadonii
, including the following: Soils in this unit are classified as the Santa Lucia-Reliz Association, where Reliz series soils occur on the ridgetops and Santa Lucia series soils on surrounding slopes (PCE 1). Reliz series soils are characterized as excessively drained shaley clay loams underlain by shale or sandstone (USDA 1978, p. 64). The vegetation in the unit is a mix of Monterey pine forest and maritime chaparral. Griffin (1978, p. 69) commented that this area was one of the only ones in the Monterey Bay area where maritime chaparral grows on shale. He also noted that sandstones exist within the shale beds and produce sandy loam soils. A related species,
Piperia elegans
, is more abundant in the surrounding Monterey pine forest (EcoSystems West 2005b, p. 7). This unit provides habitat that supports germination, growth, and reproduction. Unit 4 represents one of only two units in the region interior to the Monterey Peninsula. It supports the largest undeveloped easternmost occurrence of
P. yadonii
in the central and southern half of the species' range. Its preservation will help avoid range collapse. Features essential to the conservation of
P. yadonii
in this unit may require special management considerations or protection due to fragmentation of habitat from

development and the colonization and spread of invasive plant species (PCE 1, PCE 2). We are also excluding 49 acres (20 ha) from this subunit as a result of the Pebble Beach Company's conservation agreement.

Subunit 4a: This subunit consists of 49 ac (20 ha) of private lands (owned by the Pebble Beach Company). Lands in and/or adjacent to this subunit and subunit 4b are proposed for preservation in the Pebble Beach Company's recent development plan, but the configuration of the preservation areas is not yet determined (Monterey County 2005, pp. 2-89, 2-90).

Subunit 4b: This subunit consists of 56 ac (24 ha) of private lands (owned by the Pebble Beach Company) and proposed for preservation (see above), and 3 ac (1ha) of Monterey County road right-of-way.

Unit 5: Old Capitol

Unit 5 consists of 16 ac (7 ha) of private land (owned by the Pebble Beach Company) east of the Monterey Peninsula. Unit 5 was occupied at the time of listing (Service 1998) and is currently occupied. Surveys in 2005 revealed that the dominant
Piperia
species at this location is
P. elegans
, which number in the thousands; however, several hundred
P. yadonii
co-occur with
P. elegans
throughout the unit (EcoSystems West 2005b, pp. 5-7). This unit contains features that are essential for the conservation of
P. yadonii
, including the Chamise shaley clay loam (PCE 1) soil type. The vegetation is Monterey pine forest and coast live oak woodland. This unit provides habitat that supports germination, growth, and reproduction of
P. yadonii
. It is the only unit designated between the Monterey Peninsula (Unit 6) and Aguajito (Unit 4) to the east and, therefore, provides connectivity between these other two units.

Features essential to the conservation of
P. yadonii
may require special management considerations or protection in this unit due to: Fragmentation or loss of habitat from development, habitat degradation by motorized vehicles and encampments, debris dumping, and competition from nonnative invasive plants (PCE 1, PCE 2). The land in Unit 5 is proposed for preservation in the Pebble Beach Company's recent development plan (Monterey County 2005, pp. 2-89, 2-90).

Unit 6: Monterey Peninsula

Unit 6 consists of 920 ac (372 ha) of private and City lands on the Monterey Peninsula. This unit is divided into 5 subunits due to intervening development. Most of the lands surrounding this unit are developed for residential and recreational (golf) use. The similarities among the subunits in soils and vegetation community are discussed here; subunit specific details are discussed below. Unit 6 was occupied at the time of listing (Service 1998) and is currently occupied. It supports the greatest abundance and largest aerial extent of
Piperia yadonii
in the species' range, with close to 100,000 vegetative plants (Zander Associates and WWD Corporation 2004, all pp.; EcoSystems West 2004, pp. 1-9; EcoSystems West 2005a, 2005b, all pp.). This unit contains features that are essential for the conservation of
P. yadonii
including sands or sandy loam soils that belong to at least 5 soil series on the Monterey Peninsula unit (Baywood sands, Narlon loamy fine sands, Sheridan coarse sandy loams, Tangair fine sands, and Santa Lucia shaley clay loam). Vegetation in this unit is primarily Monterey pine forest, with maritime chaparral, and Bishop pine/Gowen cypress forest in two subunits (PCE 1). Pollinator observations and collections were made on lands in this unit (PCE 2) (Doak and Graff 2001). This unit provides habitat that supports germination, growth, reproduction, and space for shifts in the location of
P. yadonii
, as microhabitat conditions change. Features essential to the conservation of
P. yadonii
may require special management in this unit due to: Adverse effects from adjacent existing and future development, including the loss of adjacent forest canopy, increased trampling, potential hydrologic changes, overspray of pesticides, the introduction of pathogens or disease, mowing, and the introduction and spread of invasive plant species; continuing high and/or increasing deer populations resulting in high herbivory levels; and increased growth of understory vegetation due to exclusion of wildfire (PCE 1, PCE 2).

Subunit 6a: This subunit consists of 810 ac (328 ha) of private lands owned by the Pebble Beach Company and other private owners, including 17 ac (7 ha) owned by the Del Monte Forest Foundation (DMFF). Protected lands in this subunit include the SFB Morse Botanical Reserve (owned by the DMFF) and the Huckleberry Hill Natural Reserve (easement held by the DMFF). It also includes lands identified in the Pebble Beach Company's most recent development proposal for preservation or conservation: Areas PQR, G, H, I, the Corporate Yard Preservation Area, and Area D (Monterey County 2005). The Department of the Army's Presidio of Monterey is contiguous with the northeastern edge of this subunit; those lands are exempted from this designation, as described later in this rule. We have also excluded 54 acres (22 ha) from this subunit as a result of the Pebble Beach Company's conservation agreement and 6 ac (2.4 ha) from the Stevenson School property. We have also removed 35 acres (including Area D) because they do not support the PCEs. Please see the section
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
and our responses to Comments 12 and 13, for a discussion of these exclusions.

Plant communities in the Huckleberry Hill Natural Area and SFB Morse Botanical Preserve are Gowen cypress/Bishop pine forest, maritime chaparral, and Monterey pine forest. The remaining lands support primarily Monterey pine forest. Lands in this subunit support about 90,000 vegetative
Piperia yadonii
plants (Zander Associates and WWD Corporation 2004 all pp.; EcoSystems West 2004, pp. 1-9; EcoSystems West 2005a, 2005b, all pp.). Although the DMFF conducts some monitoring and removal of nonnative invasive plant populations, a management plan specifically addressing
P. yadonii
on properties owned by the DMFF has not been developed.

Subunit 6b: This subunit consists of 6 ac (2 ha) of private lands. It is identified in the Pebble Beach Company's most recent development proposal as the Bristol Curve Conservation Area (Monterey County 2005 Fig. ES-2). This subunit is part of a larger area identified by the Pebble Beach Company as Area MNOUV, which supports about 116 ac (47 ha) of Monterey pine forest and one of the two largest known occurrences of
Piperia yadonii
(about 57,000 plants (Zander Associates and WWD Corporation 2004)). The Monterey pine forest of MNOUV outside the proposed Bristol Curve conservation area is proposed for development as a golf course (Monterey County 2005). Vegetation in this subunit is Monterey pine forest with an herbaceous understory. We are excluding 1 acre (1 ha) from this subunit as a result of the Pebble Beach Company's conservation agreement, and as a result of boundary adjustments, we have not included 2 acres of proposed critical habitat within this subunit that do not support the PCEs. Please see the section

Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the

Act

and our responses to Comments 12 and 13, for a discussion of these exclusions.

Subunit 6c: This subunit consists of 31 ac (13 ha) of private lands, of which about 23 acres (9 ha) are owned by the DMFF. Lands within this unit are referred to as Indian Village (owned by the DMFF) and, in the Pebble Beach Company's recent development proposal, as Conservation Area K and Preservation Areas J and L (Monterey County 2005 Fig. ES-2). Adjacent lands (Part of Area K) that are proposed for development are not included in this subunit. We are excluding 37 acres (15 ha) from this subunit as a result of the Pebble Beach Company's conservation agreement, and we have removed 2 acres (1 ha) as a result of boundary adjustments to account for areas that do not support the PCEs. Please see the section
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
and our responses to Comments 12 and 13, for a discussion of these exclusions. The vegetation in this subunit is primarily Monterey pine forest. This subunit supports several thousand Piperia yadonii plants (Zander Associates and WWD Corporation 2004). Along with subunits 6b and 6d, it encompasses lands in the westernmost region of the Monterey Peninsula.

Subunit 6d: This subunit consists of 12 ac (5 ha) of private lands owned by the DMFF. It encompasses the Crocker Grove, an area of Monterey cypress forest with some adjacent Monterey pine forest (PCE 1). This is the westernmost subunit on the peninsula, closest to the ocean, and lands it occurs on are mapped as marine terrace 2 (Jones and Stokes 1994b, p. 11). It has been documented to support about 50 flowering
Piperia yadonii
plants (Van Dyke et. al. 2006), which typically equates to several hundred vegetative plants.

Subunit 6e: This subunit consists of 42 ac (17 ha) of private lands and 19 ac (7 (ha) owned by the City of Pacific Grove. About 29 ac (12 ha) of the private lands are owned by the DMFF. Lands within this unit are referred to as the Navajo tract and as Preservation Area B in the Pebble Beach Company's most recent development proposal (Monterey County 2005 Fig. ES-2). We are excluding 2 acres (1 ha) from this subunit as a result of the Pebble Beach Company's conservation agreement. Please see the section
Relationship of Critical Habitat to Approved Management Plans—Exclusions Under Section 4(b)(2) of the Act
for a discussion of this exclusion. The vegetation in this subunit is a mix of coast live oak and Monterey pine forest (PCE 1). It is the northernmost unit we are designating on the Peninsula. It supports several hundred plants of
Piperia yadonii
(Zander Associates and WWD Corporation 2004).

Unit 7: Point Lobos Ranch

Unit 7 consists of 228 ac (92 ha) of State land south of the Monterey Peninsula on the Big Sur coast, and 97 ac (39 ha) owned by the Big Sur Land Trust that are intended to be added to the State Parks system in the future. Unit 7 was occupied at the time of listing (Service 1998) and is currently occupied. The lands in this unit support several thousand
Piperia yadonii
plants (Graff
et al.
2003, Nedeff et al. 2003). This unit contains features that are essential for the conservation of
P. yadonii,
including the sandy loam soils in the Sheridan, Narlon, Junipero Sur complex series, underlain by granitic substrates from which terrace sands have been eroded (Griffin 1978, p. 69, USDA 1978 map no. 35). Vegetation is a composite of Monterey pine forest, maritime chaparral, Gowen cypress Bishop pine forest, with some redwood forest.
Piperia yadonii
occurs in this unit in Monterey pine forest; on exposed granitic soils in maritime chaparral dominated by Hooker's manzanita; and under a canopy of Monterey pine, Gowen cypress, and redwood (
Sequoia sempervirens
) (PCE 1). This unit provides habitat that supports germination, growth, and reproduction of
P. yadonii,
as well as population expansion and shifts in population location. This unit supports
P. yadonii
growing on soils not found in other units and in association with a varied mix of forest tree species. This is the second highest unit in elevation and supports the largest occurrence of
P. yadonii
south of the Monterey Peninsula (Graff 2006). Features essential to the conservation of
P. yadonii
may require special management in this unit due to: the growth and spread of invasive plant species, such as French broom; loss of habitat from residential development; and erosion (PCE 1, PCE 2). Access by park visitors may need to be managed to avoid creation of trails in Monterey pine forest populations and use of herbicides should be controlled to avoid or minimize effects to
P. yadonii (PCE 1)
.

Unit 8: Palo Colorado

Unit 8 consists of 73 ac (29 ha) of private land on the Big Sur coast. Unit 8 was occupied at the time of listing (Service 1998) and is currently occupied. The lands in this unit were reported to support 38 flowering
Piperia yadonii
plants (Norman 1995), which likely represents a population of several hundred to several thousand vegetative individuals, based on the observed proportions of flowering to vegetative individuals (Doak and Graff 2001). This unit contains features that are essential for the conservation of
P. yadonii
including the following: A mix of sandy loam soils, shallow soils less than 20 inches deep, and rock outcrops classified as the Junipero-Sur complex and Rock Outcrop—Xerorthents Association (PCE 1) (USDA 1978, p. 38). Vegetation in this unit has been described as a unique association of maritime chaparral, with low-growing hybrid
Arctostaphylos glandulosa
as the dominant manzanita under which
P. yadonii
occurs (Norman 1995). This unit provides habitat that supports germination, growth, and reproduction of
P. yadonii
. This unit supports the most southern and highest elevation (1,000 to 1,400 feet (300 to 430 m)) occurrence in the species' range. Features essential to the conservation of
P. yadonii
may require special management in this unit due to habitat fragmentation and habitat degradation from road and trail grading and from future development, such as the introduction and spread of nonnative plants, removal of native vegetation, erosion, and hydrologic changes (PCE 1, PCE 2).

Effects of Critical Habitat Designation

Section 7 Consultation

Section 7(a)(2) of the Act requires Federal agencies, including the Service, to ensure that actions they fund, authorize, or carry out are not likely to destroy or adversely modify critical habitat. Decisions by the Fifth and Ninth Circuit Court of Appeals have invalidated our definition of adversely modify (see
Gifford Pinchot Task Force
v.
U.S. Fish and Wildlife Service,
378 F. 3d 1059 (9th Cir 2004) and
Sierra Club
v.
U.S. Fish and Wildlife Service et al.
, 245 F.3d 434, 442F (5th Cir 2001)), and we do not rely on this regulatory definition when analyzing whether an action is likely to destroy or adversely modify critical habitat. Pursuant to the statutory provisions of the Act, destruction or adverse modification is determined on the basis of whether, with implementation of the proposed Federal action, the affected critical habitat would remain functional (or retain the current ability for the primary constituent elements to be functionally established) to serve its intended conservation role for the species.

Section 7(a)(4) of the Act requires Federal agencies to confer with us on any action that is likely to jeopardize the continued existence of a species proposed for listing or result in destruction or adverse modification of proposed critical habitat. This is a procedural requirement only. However, once a species proposed for listing becomes listed, or proposed critical habitat is designated as final, the full prohibitions of section 7(a)(2) apply to any Federal action. The primary utility of the conference procedures is to maximize the opportunity for a Federal agency to adequately consider species proposed for listing and critical habitat and avoid potential delays in implementing their proposed action because of the section 7(a)(2) compliance process, should those species be listed or the critical habitat designated.

Under conference procedures, the Service may provide advisory conservation recommendations to assist the agency in eliminating conflicts that may be caused by the proposed action. The Service may conduct either informal or formal conferences. Informal conferences are typically used if the proposed action is not likely to have any adverse effects to the species proposed for listing or proposed critical habitat. Formal conferences are typically used when the Federal agency or the Service believes the proposed action is likely to cause adverse effects to species proposed for listing or critical habitat, inclusive of those that may cause jeopardy or adverse modification.

The results of an informal conference are typically transmitted in a conference report, while the results of a formal conference are typically transmitted in a conference opinion. Conference opinions on proposed critical habitat are typically prepared according to 50 CFR 402.14, as if the proposed critical habitat were designated. We may adopt the conference opinion as the biological opinion when the critical habitat is designated, if no substantial new information or changes in the action alter the content of the opinion (see 50 CFR 402.10(d)). As noted above, any conservation recommendations in a conference report or opinion are strictly advisory.

If a species is listed or critical habitat is designated, section 7(a)(2) of the Act requires Federal agencies to ensure that activities they authorize, fund, or carry out are not likely to jeopardize the continued existence of such a species or to destroy or adversely modify its critical habitat. If a Federal action may affect a listed species or its critical habitat, the responsible Federal agency (action agency) must enter into consultation with us. As a result of this consultation, compliance with the requirements of section 7(a)(2) will be documented through the Service's issuance of: (1) A concurrence letter for Federal actions that may affect, but are not likely to adversely affect, listed species or critical habitat; or (2) a biological opinion for Federal actions that are likely to adversely affect listed species or critical habitat.

When we issue a biological opinion concluding that a project is likely to result in jeopardy to a listed species or the destruction or adverse modification of critical habitat, we also provide reasonable and prudent alternatives to the project, if any are identifiable. “Reasonable and prudent alternatives” are defined at 50 CFR 402.02 as alternative actions identified during consultation that can be implemented in a manner consistent with the intended purpose of the action, that are consistent with the scope of the Federal agency's legal authority and jurisdiction, that are economically and technologically feasible, and that the Director believes would avoid jeopardy to the listed species or destruction or adverse modification of critical habitat. Reasonable and prudent alternatives can vary from slight project modifications to extensive redesign or relocation of the project. Costs associated with implementing a reasonable and prudent alternative are similarly variable.

Regulations at 50 CFR 402.16 require Federal agencies to reinitiate consultation on previously reviewed actions in instances where a new species is listed or critical habitat is subsequently designated that may be affected and the Federal agency has retained discretionary involvement or control over the action or such discretionary involvement or control is authorized by law. Consequently, some Federal agencies may request reinitiation of consultation with us on actions for which formal consultation has been completed, if those actions may affect subsequently listed species or designated critical habitat or adversely modify or destroy proposed critical habitat.

Federal activities that may affect
Piperia yadonii
or its designated critical habitat require consultation under section 7(a)(2) of the Act. Activities on State, Tribal, local, or private lands requiring a Federal permit (such as a permit from the Corps under section 404 of the Clean Water Act or a permit under section 10(a)(1)(B) of the Act from the Service) or involving some other Federal action (such as funding from the Federal Highway Administration, Federal Aviation Administration, or the Federal Emergency Management Agency) will also be subject to the section 7 consultation process. Federal actions not affecting listed species or critical habitat, and actions on State, Tribal, local, or private lands that are not federally funded, authorized, or permitted, do not require section 7 consultations.

Application of the Adverse Modification Standard for Actions Involving Effects to the Critical Habitat of Piperia yadonii

For the reasons described in the Director's December 9, 2004, memorandum, the key factor related to the adverse modification determination is whether, with implementation of the proposed Federal action, the affected critical habitat would remain functional (or retain the current ability for the primary constituent elements to be functionally established) to serve its intended conservation role for the species. Activities that may destroy or adversely modify critical habitat are those that alter the PCEs to an extent that the conservation value of critical habitat for
Piperia yadonii
is appreciably reduced. Generally, the conservation role of
Piperia yadonii
critical habitat units is to support viable core area populations.

Section 4(b)(8) of the Act requires us to briefly evaluate and describe, in any proposed or final regulation that designates critical habitat, those activities involving a Federal action that may destroy or adversely modify such habitat, or that may be affected by such designation.

Activities that, when carried out, funded, or authorized by a Federal agency, may affect critical habitat and, therefore, should result in consultation for
Piperia yadonii
include, but are not limited to:

(1) Actions that would remove or destroy
Piperia yadonii
plants or remove flowering stalks. Such activities could include, but are not limited to, grading, plowing, mowing, burning during the growing or flowering season, driving over plants, unrestricted creation of trails through occurrences, unrestricted mechanical weed control, and/or unlimited use of herbicides.

(2) Actions that would increase the establishment and spread of invasive nonnative species in
Piperia yadonii
habitat or increase the invasability of the plant community within which
P. yadonii
occurs. Such activities could include, but are not limited to: Grading; plowing; road building and maintenance; introducing seeds or other propagules of invasive species during erosion-control practices and/or

landscaping practices; isolating habitat patches within a matrix of residential or other development; off road vehicle traffic; and/or livestock grazing. These activities could encourage the establishment and spread species such as French broom or jubata grass, which can compete with
P

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Source: Frix Law Library, https://www.frixlaw.com/law-library/documents/fr%3A07-5136. Public record. Not legal advice.