Federal Register, Volume 75, Number 95, May 18, 2010, Pages 27631-27922 Page: 27,693
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Federal Register/Vol. 75, No. 95/Tuesday, May 18, 2010/Proposed Rules
of approximately 44 ac (18 ha) of
privately owned land. This subunit
meets the definition of critical habitat
for this species because of its
contribution to the genetic diversity of
the species (McGlaughlin and Friar
2007, p. 329; see "Genetics" section of
the proposed rule (74 FR 44241)).
Subunit 3B contains physical and
biological features that are essential to
the conservation of Ambrosia pumila,
including sandy loam or clay soils
located on an upper terrace of a water
source, which provide nutrients,
moisture, and periodic flooding
presumed necessary for the plant's
persistence (PCE 1), and nonnative
grassland habitat type, which allows
adequate sunlight and airflow for A.
pumila (PCE 2). The physical and
biological features essential to the
conservation of the species in this
subunit may require special
management considerations or
protection to address threats from
nonnative plant species in situations
where nonnative species are out-
competing A. pumila for resources, from
human foot and vehicle traffic that may
occur in the area, and from
development. Please see the "Special
Management Considerations or
Protection" section of the proposed rule
(74 FR 44244-44245, August 27, 2009)
for a discussion of the threats to A.
pumila habitat and potential
management considerations.
Subunit 4D: Gird Road/Monserate Hill
We re-evaluated all information
available for Ambrosia pumila
occurrences and determined that the
Gird Road/Monserate Hill area (Subunit
4D) meets the definition of critical
habitat, despite its small size relative to
other proposed units. We are proposing
Subunit 4D as critical habitat because
this area is within the geographical area
occupied by the species at the time of
listing, contains the physical and
biological features essential to the
conservation of the species, and meets
the criteria for inclusion in critical
habitat. We mapped the boundary of
this subunit using our current mapping
methodology as described in the
Methods section of the proposed rule
(74 FR 44245-44247, August 27, 2009).
Subunit 4D is located in the Fallbrook
area of northern San Diego County,
California. This subunit is adjacent to
the north side of State Route 76, almost
the same distance from both Gird Road
(to the west) and Monserate Hill Road
(to the east). Subunit 4D consists of
approximately 20 ac (8 ha) of privately
owned land and 1 ac (0.5 ha) of State-
owned land for a total of approximately21 ac (9 ha). This subunit meets the
definition of critical habitat for the
species because of its contribution to the
genetic diversity of the species
(McGlaughlin and Friar 2007, p. 329;
see "Genetics" section of the proposed
rule (74 FR 44241)). Subunit 4D
contains physical and biological
features that are essential to the
conservation of Ambrosia pumila,
including sandy loam or clay soils
located on an upper terrace of a water
source, which provide nutrients,
moisture, and periodic flooding
presumed necessary for the plant's
persistence (PCE 1), and nonnative
grassland habitat type, which allows
adequate sunlight and airflow for A.
pumila (PCE 2). The physical and
biological features essential to the
conservation of the species in this
subunit may require special
management considerations or
protection to address threats from
nonnative plant species in situations
where nonnative species are out-
competing A. pumila for resources, from
foot and vehicle traffic in the area, and
from development and road
maintenance. Please see the "Special
Management Considerations or
Protection" section of the proposed rule
(74 FR 44244-44245, August 27, 2009)
for a discussion of the threats to A.
pumila habitat and potential
management considerations.
Subunit 5B: Lake Hodges West - Crosby
Estates
We were unaware that the Crosby
Estates occurrence (Subunit 5B) of
Ambrosia pumila is extant when we
developed the proposed rule to
designate critical habitat for the species
(74 FR 44238, August 27, 2009);
therefore, this area was not included in
the proposed rule. This occurrence was
extant at the time of listing, but was
thought to have been extirpated. We
have since obtained information (The
Crosby at Rancho Santa Fe Habitat
Management Plan Annual Report 2008
(Rincon Consultants, Inc. 2008))
confirming this occurrence is extant and
viable. Based on this information, we
are proposing Subunit 5B as critical
habitat because it is currently occupied,
is within the geographical area occupied
by the species at the time of listing,
contains the physical and biological
features that are essential to the
conservation of the species, and meets
the criteria for inclusion in critical
habitat. We mapped the boundary of
this subunit using our current mapping
methodology as described in the
Methods section of the proposed rule
(74 FR 44245-44247, August 27, 2009).Unit 5 as described in the proposed rule
(74 FR 44249-44250) is now Subunit
5A.
Subunit 5B is located just west of
Lake Hodges in the western portion of
central San Diego County, California.
This subunit is on and adjacent to the
west side of the Crosby National Golf
Club. Subunit 5B consists of
approximately 116 ac (47 ha) of
privately owned land, 2 ac (1 ha) of
local government owned land, and 155
ac (63 ha) of County-owned land for a
total of approximately 273 ac (111 ha).
This subunit is meets the definition of
critical habitat for this species because
of its contribution to the genetic
diversity of the species (McGlaughlin
and Friar 2007, p. 329; see "Genetics"
section of the proposed rule (74 FR
44241)). Subunit 5B contains physical
and biological features that are essential
to the conservation of Ambrosia pumila,
including sandy loam or clay soils
located on an upper terrace of a water
source, which provide nutrients,
moisture, and periodic flooding
presumed necessary for the plant's
persistence (PCE 1), and nonnative
grassland habitat type, which allows
adequate sunlight and airflow for A.
pumila (PCE 2). The physical and
biological features essential to the
conservation of the species in this
subunit, including features within the
approximately 155 ac (63 ha) portion of
Subunit 5B that is conserved (57
percent), may require special
management considerations or
protection to address threats from
nonnative plant species in situations
where nonnative species are out-
competing A. pumila for resources, from
human encroachment that may occur in
the area, and from golf course
maintenance. Please see the "Special
Management Considerations or
Protection" section of the proposed rule
(74 FR 44244-44245, August 27, 2009)
for a discussion of the threats to A.
pumila habitat and potential
management considerations.
Additional Areas Currently Considered
For Exclusion Under Section 4(b)(2) of
the Act -Western Riverside County
Multiple Species Habitat Conservation
Plan (Western Riverside County
MSHCP)
Under section 4(b)(2) of the Act, the
proposed rule discusses approximately
263 ac (106 ha) proposed as critical
habitat in Unit 1 (Subunits 1A and 1B),
Unit 2, and Subunit 3A (formerly Unit
3 in the proposed rule) that we are
considering whether or not to exercise
our discretion to exclude from critical
habitat designation. We are also
considering exclusion of approximately44 ac (18 ha) of Ambrosia pumila
27693
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United States. Office of the Federal Register. Federal Register, Volume 75, Number 95, May 18, 2010, Pages 27631-27922, periodical, May 18, 2010; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc52676/m1/71/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.