Home Archived April 13, 2016

Multi-scale modeling of amphibian occupancy patterns


Location(s): Great Lakes ecoregion, particularly nine National Park Service units within the region


  • Assess potential trends in site occupancy (ψ)
  • account for detectability in a percent-area-occupied framework e.g., water temperature, air temperature, Julian date, aquatic extent
  • Use data on the numbers of animals (e.g., the NAAMP calling index) of each focal species observed at each sampling location to complement information on occupancy

Funding: U.S. National Park Service

Collaborators: USGS Upper Midwest Environmental Sciences Center, the Field Museum of Chicago, Natural Resources Research Institute (University of Minnesota-Duluth)


Bowen, K.B., and E.A. Beever. 2010. Pilot amphibian monitoring at Apostle Islands, Pictured Rocks, and Sleeping Bear Dunes National Lakeshores: analysis and recommendations. NPS Natural Resource Report NPS/GLKN/NRTR–2010/360.

Bowen, K.B., and E.A. Beever. 2010. Daytime amphibian surveys at three National Lakeshores in the Western Great Lakes ecoregion. Reptiles & Amphibians 17(1):26-35.

Bowen, K.D., E.A. Beever, and U.B. Gafvert. 2009. Improving the design of amphibian surveys using soil data: a case study in two wilderness areas. Natural Areas Journal 29(2):117-125.

Bowen, K.D., S.D. McMahon, and E.A. Beever. 2007. Geographic distribution. Elaphe vulpina (Western Foxsnake). Herpetological Review 38(4):486.