Skip to Main Content
Estimating occupancy in large landscapes: Evaluation of amphibian monitoring in the Greater Yellowstone EcosystemAuthor(s): William R. Gould; Debra A. Patla; Rob Daley; Paul Stephen Corn; Blake R. Hossack; Robert Bennetts; Charles R. Peterson
Source: Wetlands. 32: 379-389.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
View PDF (518.42 KB)
DescriptionMonitoring of natural resources is crucial to ecosystem conservation, and yet it can pose many challenges. Annual surveys for amphibian breeding occupancy were conducted in Yellowstone and Grand Teton National Parks over a 4-year period (2006-2009) at two scales: catchments (portions of watersheds) and individual wetland sites. Catchments were selected in a stratified random sample with habitat quality and ease of access serving as strata. All known wetland sites with suitable habitat were surveyed within selected catchments. Changes in breeding occurrence of tiger salamanders, boreal chorus frogs, and Columbia-spotted frogs were assessed using multi-season occupancy estimation. Numerous a priori models were considered within an information theoretic framework including those with catchment and site-level covariates. Habitat quality was the most important predictor of occupancy. Boreal chorus frogs demonstrated the greatest increase in breeding occupancy at the catchment level. Larger changes for all 3 species were detected at the finer site-level scale. Connectivity of sites explained occupancy rates more than other covariates, and may improve understanding of the dynamic processes occurring among wetlands within this ecosystem. Our results suggest monitoring occupancy at two spatial scales within large study areas is feasible and informative.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationGould, William R.; Patla, Debra A.; Daley, Rob; Corn, Paul Stephen; Hossack, Blake R.; Bennetts, Robert; Peterson, Charles R. 2012. Estimating occupancy in large landscapes: Evaluation of amphibian monitoring in the Greater Yellowstone Ecosystem. Wetlands. 32: 379-389.
Keywordscolonization, conservation, detection, extinction, trend, wetlands
- Breeding chorus indices are weakly related to estimated abundance of boreal chorus frogs
- Lack of significant changes in the herpetofauna of Theodore Roosevelt National Park, North Dakota, since the 1920s
- Responses of pond-breeding amphibians to wildfire: Short-term patterns in occupancy and colonization
XML: View XML