30792 – Distribution and abundance of bat species in Crater Lake and others

Investigator’s Annual Reports (IAR’s) for Crater Lake National Park

Distribution and relative abundance of bat species in Crater Lake National Park, Redwood National and State Parks, and Oregon Caves National Monument


Report Number: 30792

Reporting Year: 2004

Permit Number: CRLA-2004-SCI-0007

Current Status: Checked in

Date Received: Mar 09, 2005

Principal Investigator: Mr Andrew Duff, Klamath Network Inventory and Monitoring Program, Ashland, OR

Additional investigator(s): Daniel Sarr (providing funding)  

Park-assigned Study Id. # CRLA-04024

Permit Expiration Date: Dec 28, 2005

Permit Start Date: Aug 01, 2004

Study Starting Date: Aug 01, 2004

Study Ending Date: Jun 28, 2006

Study Status: Continuing

Activity Type: Inventory

Subject/Discipline: Mammals

Objectives: This project will use bat presence-absence and relative abundance data to predict bat species distribution and abundance in the Klamath network. Bats will be monitored at CRLA, REDW, and ORCA. Presence of bat species will be determined by live trapping using mist nets and harp traps and by acoustic sampling. Species-specific models will be based on climatic, vegetation, and landscape features derived from GIS databases. This study will directly address ecological questions relevant to bat conservation within the Klamath network by evaluating species distributions with respect to biotic and abiotic landscape scale patterns. This will enable land managers to better understand how current land use practices and other landscape features (e.g., climate, elevation, vegetation) influence regional bat populations in the network.

Findings and Status: Mist nets and harp traps were used to capture bats at 8 locations during 11 nights of trapping (1,798.2 m2 net hours of netting effort) between 8 and 26 August 2004 in Crater Lake National Park (CRLA). I captured 47 bats representing 5 species in mist nets. Three species represented 76.3% of our mist net captures. Long-legged myotis (Myotis volans) was our most frequently captured bat (27.7%) although the species was only captured at 2 sites. Little-brown myotis (M. lucifugus) (27.3%) and long-eared myotis (M. evotis) (21.3%) were the second and third most frequently captured bat at CRLA. The remaining 23.7% of our captures consisted of Yuma myotis (M. yumanensis) (14.9%) and silver-haired bats (Lasionycteris noctivagans) (10.6%). At CRLA, 93.9% of our captures were males. Females were captured on Sun Creek near Vidae falls and at Annie spring. I was unsuccessful at capturing bats at 4 sites. echolocating bats at mist netting locations. AnaBat was also used at 6 sites in each park where live capture techniques were not employed. This facilitated documenting bat presence and activity in areas where mist netting was logistically impossible and it also provides data throughout the night. Overall at CRLA, I recorded 1,240 AnaBat II sequence files.

For this study, were one or more specimens collected and removed from the park but not destroyed during analyses? No

Funding provided this reporting year by NPS: 15000

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


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