Report Number: 27732
Permit Number: CRLA-2002-SCI-0009
Current Status: Checked in
Date Received: Mar 17, 2004
Reporting Year:
2002
Principal Investigator:
Mr Scott Mahady, Klamath
Network-National Park Service, Ashland, OR
Additional investigator(s):
Daniel Sarr, Daryl
Weldon
Park-assigned Study Id. #
CRLA-02032
Permit Expiration Date:
Oct 14, 2002
Permit Start Date:
Jul 08, 2002
Study Starting Date:
Jul 08, 2002
Study Ending Date:
Oct 14, 2002
Study Status:
Completed
Activity Type:
Inventory
Subject/Discipline:
Mammals
Objectives:
The primary objective of this
study is to cunduct a small mammal inventory that will accurately document the
presence of at least 90 percent all small mammal species ossurring in the Crater
Lake National Park. The second objective of this inventory will be to document
distribution of the species encountered within the habitats sampled in each park
and across the Klamath Network as a whole. The third objective will be to
provide baseline data for the Klamath Network that could be used to create an
effective small mammal monitoring program.
This network effort will necessarily be
customized in Lassen Volcanic National Park to best complement existing
inventory information and ongoing monitoring activities.
Findings and Status: Three 240m
transects were trapped at CRLA. One linear transect was set on a rocky hillside
(Hillman Peak), one linear transect was placed in a wet meadow/riparian area,
and the third transect was linear and placed in a mature lodgepole pine forest.
Eight species were observed from 145
captures during a 600 trap night effort. Trap success averaged 24.2%. The
Pacific Jumping Mouse (Zapus trinotatus) accounted for 37% (54/147) of all
captures. Unique captures included an Ermine (Mustela erminea) along with a
Mazama Pocket Gopher (Thomomys mazama). The other six species observed were all
known to be present at the park.
Recommendations for surveying in the 2003
season include focusing effort on delineating the Townsend complex of chipmunks
in the park. Road kills and other specimens should be collected to attempt to
accurately document the four different Tamias species that are likely present
within the park. Modification of the trapping schedule should be attempted so
that sherman live traps are left open during the morning after the traps are
checked at dawn, and rechecked and closed in two to three hours. By running the
Sherman live traps for a few hours during the morning it would be possible to
document the presence of the different chipmunk species. Inventory surveys
should also attempt to document the presence of the pinon mouse (Peromyscus
treui), the White-footed Vole, the Heather Vole (Phenacomys intermedius), and
the Townsend's Vole (Microtus townsendii). The Pinon Mouse inhabits dry areas
with Pinon Pine and/or juniper trees. The White-footed Vole inhabits dense
woodlands along riparian corridors. The Heather Vole appears to be rather
general in its habitat affinities and surveys for it could be conducted in
montane/subalpine meadows, along riparian corridors near woodlands, and in
stands of Douglas-fir or Engelman Spruce. The Townsend's Vole can be difficult
to live trap, but is easily taken by snap traps, and is found in wet grassland
habitats such as lowland meadows, boggy areas and marshes.
Data management recommendations include
checking on the voucher of Clethrionomys gapperi and Clethrionomys californicus.
It is unlikely that both species are present at the park. The voucher specimen
lists C.g.mazama. Yet only C.g.idahoensis is supposed to occurs in Oregon.
Further information that this voucher may be incorrectly identified is C.
californicus mazama is one of the three recognized sub-species of C.
californicus to occur in Oregon. Also, Clethrionomys occidentalis is no longer
used and should be changed to Clethrionomys californicus. The genus Eutamias
should be changed to Tamias. Voucher specimens collected from Crater Lake
National Park for four species: Phenacomys (Arborimus) intermedius, Sorex
sonomae, Tamias senex, and Sorex pacificus, are all listed in the ?The Land
Mammals of Oregon?. Sorex pacificus is not even on the species list for Crater
Lake. These specimens should be located and their information entered into ANCS,
and the species list updated as needed.
For this study, were one or
more specimens collected and removed from the park but not destroyed during
analyses?
Yes
Funding provided this
reporting year by NPS:
4680
Funding provided this
reporting year by other sources:
0
Full name of college or
university: n/a
Annual funding provided by
NPS to university or college this reporting year: 0
