Draft Recovery Plan for Applegate's Milk-Vetch (Astragalus Applegate) 1997

86 Pages·1997·2.7 MB·English

by  Gisler, Steven D., Meinke, Robert J.

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DRAFT
Recovery Plan for
Applegate's Milk-vetch
(Astragalus applegatei)
1997
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Applegate's milk-vetch {Astragalus applegatei)
DRAFT RECOVERY PLAN
Prepared by
Steven D. Gisler and Robert J. Meinke
Oregon Department ofAgriculture
Plant Conservation Biology Program
for
Region
1
U.S. Fish and Wildlife Service
Approved:
Regional Director, U.S. Fish and Wildlife Service
Date:

As the Nation's principal conservation agency, the
Department ofthe Interior has responsibility for most of
our nationally ownedpublic lands and naturalresources.
Thisincludesfosteringthewisestuseofourlandandwater
resources, protecting ourfish andwildlife, preserving the
environmental and cultural values ofour national parks
andhistoricalplaces, andproviding for the enjoymentof
life through outdoor recreation. TheDepartmentassesses
ourenergyandmineralresourcesandworkstoassurethat
theirdevelopmentis in the bestinterestsofallourpeople.
The Department also has a major responsibility for
American Indian reservation communitiesandforpeople
who live in island Territories under U.S. administration.

DISCLAIMER
Recovery plans delineate reasonable actions which are believed to be required to recover
and/or protect the species. Plans are prepared by the U.S. Fish and Wildlife Service, often
with the assistance ofrecovery teams, contractors, state agencies, and others. Objectives
will only be attained and funds expended contingent upon appropriations, priorities, and
other budgetary constraints. Recovery plans do not necessarily represent the views nor
the official positions or approvals ofany individuals or agencies, other than the U.S. Fish
and Wildlife Service, involved in the plan formulation. They represent the official position
ofthe U.S. Fish and Wildlife Service only after they have been signed by the Regional
Director or Director as approved Approved recovery plans are subject to modification as
.
dictated by new findings, changes in species status, and the completion ofrecovery tasks.
LITERATURE CITATION
Literature citation should read as follows:
U.S. Fish and Wildlife Service. 1997. Applegate's milk-vetch (Astragalus applegatei)
draft recovery plan. U.S. Fish and Wildlife Service, Portland, Oregon. 34 pages.
Additional copies may be purchased from:
Fish and Wildlife Reference Service:
5430 Grosvenor Lane, Suite 1 10
Bethesda, Maryland 20814
telephone: [phone] or 1-800-582-3421
fax: [phone]
e-mail [email protected]
Fees for plans vary depending on the number ofpages.

EXECUTIVE SUMMARY
Current Status: Applegate 's milk-vetch (Astragalus applegatei Peck) is a perennial
plant species in the legume family (Fabaceae) listed as endangered by the U.S. Fish and
Wildlife Service. Believed extinct until its rediscovery in 1983, Applegate's milk-vetch is
currently known from only two populations, collectively supporting an estimated 12,000
individuals. The species is a narrow endemic, known only from the Lower Klamath Basin
near the city ofKlamath Falls, Klamath County, in southern Oregon.
Habitat Requirements and Limiting Factors: Applegate 's milk-vetch is restricted to
flat-lying, seasonally moist, strongly alkaline soils. Although currently replete with
introduced grasses and other weeds, the species' habitat was historically characterized by
sparse, native bunch grasses, and patches ofbare soil. Intensive agricultural and urban
development ofthe Klamath River floodplain has resulted in severe depletion and
fragmentation ofthe species' habitat. Only three populations are known to be extant, the
largest ofwhich continues to face imminent attrition through industrial development on
private lands. Virtually all remaining potential (undeveloped) habitat for the species has
been seriously modified by the proliferation ofweeds, suppression offloods and tires, and
land reclamation projects involving extensive construction ofdrainage ditches and water
retention dikes.
As a consequence ofhabitat modification, Applegate's milk-vetch may be limited by
competition from exotic weeds. The immediacy ofthe species' threats is intensified by the
small number and limited distribution ofremaining populations, which increases the milk-
vetch's vulnerability to extirpation due to random mortality events. Furthermore, two of
the three extant populations support fewer than 500 individuals, possibly not enough to
maintain the genetic variability necessary for long-term population viability. Expansion of
populations ofApplegate's milk-vetch appears to be limited by caterpillars feeding on the
plants, low seed production, and seed loss to pre-dispersal predation by adult and larval
beetles.
Recovery Objective: Downlisting to threatened status
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