Final Reports

Mahady S., and Bunn W. 2003. Annual report for the Klamath Network Inventory Program: 2003 Small Mammal      Inventory.

Mahady S., and Bunn W. 2002. Annual report for the Klamath Network Inventory Program: 2003 Small Mammal      Inventory.

 

Final Deliverables

A zipped file of all the final deliverables from this inventory (final reports, GIS data, and raw data) is accessible from the NPS Data Store at: http://science.nature.nps.gov/nrdata/metadata.cfm?ID=48315

 

2002 Results

Crater Lake National Park

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.

Lassen Volcanic National Park

Nine species were recorded from 133 captures.  Trapping effort was 400 trap nights with an average trap success of 33.3%.   The ubiquitous Deer Mouse accounted for 58% (76/132) of all captures.  Two species were observed that are not on the species list for LAVO.  One of these species was field identified as the Merriam Shrew (Sorex merriami).  The other species observed that is not on the species list is the California Vole (Microtus californicus).  Vouchers were obtained for both the Merriam Shrew and the California Vole.  These specimens and are being sent to the Museum of Vertebrate Zoology at Berkeley for confirmation and preparation of study skins.

Lava Beds National Monument

Eight species were observed from 164 captures during 600 trap nights.  Trap success averaged 27.3%.  The Yellow-pine Chipmunk (Tamias amoenus) accounted for 52% (85/163) of all captures. Unfortunately all eight species observed are already known to be present at the park, and a voucher specimen already exists for all eight species. Trapping for next year should continue using the randomly selected sites that were determined this year.  There are no recommendations for targeting specific species or habitats within LABE at this time.

Oregon Caves National Monument

Six species were observed from 269 captures.  Trapping effort was 1050 trap nights, and trap success averaged 25.6%.  All five species observed during the trapping period were already known to be present at the park.  Documentation of mice and vole species was very limited during the 2002 season.  Only one species of Cricetine mice was observed during the 2002 trapping session.  The Deer Mouse (Peromyscus maniculatus) accounted for 49% (132/269) of all captures at ORCA.  The Deer Mouse is found throughout the region and was observed in all of the habitats surveyed this summer at all five parks.  The mouse is especially prevalent in wooded or forested habitats.  The Siskiyou Chipmunk was captured 100 times and accounted for 37% of all captures.

The Western Red-Backed Vole (Clethrionomys californicus), was the only vole captured this summer at ORCA.  Three other species of Microtine mice (Voles) are known to occur within the monument, and five other species of voles could occur within the monument boundaries.  The Western red-backed Vole is usually associated with closed canopy forests with lots of downed logs.  None of the grassland associated voles were observed even though both meadows existing in the monument were surveyed.  The only species captured in 2002 at ORCA that is not primarily associated with forested habitats was the Vagrant Shrew (Sorex vagrans).

Redwood National and State Parks

Thirteen species were recorded from 165 captures during a 680 trap night effort.  Trap success averaged 24.3%.  The Deer Mouse (Peromyscus maniculatus) accounted for 37% (61/165) of all captures, and was present in all three transects surveyed.  Seven species were observed that were listed as probably present on the parks species list and were not previously documented in ANCS: the Pinon Mouse (Peromyscus trueii), House Mouse (Mus muscula), Marsh Shrew (Sorex bendirii), Pacific Shrew (Sorex pacificus), Mole Shrew (Neurtrichus gibbsii), Creeping Vole (Microtus oregoni), Siskiyou Chipmunk (Tamias siskiyou), and the Long-tailed Vole (Microtus longicaudus). Four out of five species of shrew thought to occur in the park were observed.  Only the Fog Shrew (Sorex sonomae) was not observed.

2003 Results

Whiskeytown National Recreation Area

Ten species were recorded from 426 captures during a 1560 trap night effort.  Trap success averaged 27%.  The Deer Mouse (Peromyscus maniculatus) was the most frequently captured species, comprising 70% of the recorded observations (298/426).  The Brush Mouse (Peromyscus bolyii) was the second most common (114/426; 27%) species observed.  The other eight species captured were observed fewer than six times each.  Three species on the species list but not previously confirmed within WHIS were observed: the Sonoma Chipmunk (Tamias sonomae), the Allen’s Chipmunk (Tamias senex), and the Vagrant Shrew (Sorex vagrans).  Two other species were observed that were not listed as confirmed, although voucher specimens from 1911 were recently found: the California Vole (Microtus californicus) and the Trowbridge Shrew (Sorex trowbridgii).