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Estimating occupancy in large landscapes: evaluation of amphibian monitoring in the greater Yellowstone ecosystem

Wetlands

By:
, , , , , ,
DOI: 10.1007/s13157-012-0273-0

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Abstract

Monitoring 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.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Estimating occupancy in large landscapes: evaluation of amphibian monitoring in the greater Yellowstone ecosystem
Series title:
Wetlands
DOI:
10.1007/s13157-012-0273-0
Volume
32
Issue:
2
Year Published:
2012
Language:
English
Publisher:
Springer
Contributing office(s):
Northern Rocky Mountain Science Center
Description:
11 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
379
Last page:
389
Country:
United States
State:
Wyoming
Other Geospatial:
Yellowstone National Park;Grand Teton National Park