Wetlands

, Volume 32, Issue 2, pp 379–389

Estimating Occupancy in Large Landscapes: Evaluation of Amphibian Monitoring in the Greater Yellowstone Ecosystem

  • William R. Gould
  • Debra A. Patla
  • Rob Daley
  • Paul Stephen Corn
  • Blake R. Hossack
  • Robert Bennetts
  • Charles R. Peterson
Article

DOI: 10.1007/s13157-012-0273-0

Cite this article as:
Gould, W.R., Patla, D.A., Daley, R. et al. Wetlands (2012) 32: 379. doi:10.1007/s13157-012-0273-0

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.

Keywords

Colonization Conservation Detection Extinction Trend Wetlands 

Supplementary material

13157_2012_273_MOESM1_ESM.pdf (367 kb)
ESM 1(PDF 367 kb)

Copyright information

© US Government 2012

Authors and Affiliations

  • William R. Gould
    • 1
  • Debra A. Patla
    • 2
  • Rob Daley
    • 3
  • Paul Stephen Corn
    • 4
  • Blake R. Hossack
    • 4
    • 5
  • Robert Bennetts
    • 3
  • Charles R. Peterson
    • 2
  1. 1.Applied Statistics ProgramNew Mexico State UniversityLas CrucesUSA
  2. 2.Department of Biological SciencesIdaho State UniversityPocatelloUSA
  3. 3.National Park Service, Greater Yellowstone NetworkBozemanUSA
  4. 4.U.S. Geological Survey, Northern Rocky Mountain Science CenterAldo Leopold Wilderness Research InstituteMissoulaUSA
  5. 5.Wildlife Biology ProgramUniversity of MontanaMissoulaUSA