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Factors affecting detection of American woodcock on singing-ground surveys

Duration

September 2007 - December 2011

Narrative

American woodcock are a species of management concern, having experience population declines across much of their eastern North American breeding distribution. The Singing-ground Survey (SGS) is the primary mechanism by which American woodcock populations are monitored, although there remain questions about factors that influence counts on surveys. We are assessing factors that influence the reliability and precision of Singing-ground Surveys to estimate American woodcock population trends by 1) estimating detectability of woodcock using current sampling protocol, repeated (occupancy) sampling of a subsample of survey routes, assessing detectability based on video or telemetry to refine conditions under which woodcock are detectable, double observer assessment of detectability, and observer variability by repeating survey routes to assess detection probability through time, and (2) comparing woodcock density along SGS survey routes with randomly-located experimental routes in adjacent areas to directly assess whether counts on existing routes adequately represent the larger landscape. Results of this study can be used to refine survey protocol to better track woodcock abundance.

Research Products and Activities

Peer Reviewed Publications

  • Bergh, S. M. and D. E. Andersen. Estimating density and effective area surveyed for American woodcock. 11th American Woodcock Symposium.
  • Bergh, S.M. and D.E. Andersen. Occupancy and detection probability of American woodcock during Singing-ground Surveys. 11th American Woodcock Symposium.

Thesis

  • Bergh, S.M. 2011. Factors influencing detection of American woodcock during Singing-ground Surveys. M.S. Thesis, University of Minnesota, St. Paul, Minnesota, U.S.A. 64pp.Download  | 

Presentations

  • Bergh, S.M. and D.E. Andersen. 2010. Factors affecting detection of American woodcock on Singing-ground Surveys. 17th Annual Conference of The Wildlife Society, Snowbird, Utah.
  • Bergh, S.M. and D.E. Andersen. 2010. Factors affecting detection of American woodcock on Singing-ground Surveys. 17th Annual Conference of The Wildlife Society, Snowbird, Utah.
  • Bergh, S.M. and D.E. Andersen. 2010. Estimation of the effective area surveyed for American woodcock on Singing-ground Surveys. 71st Midwest Fish and Wildlife Conference. Minneapolis, Minnesota.
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Current Staff

Federal Staff: 95

Masters Students: 249

Phd Students: 143

Post Docs: 55

University Staff: 247

5 Year Summary

Students graduated: 679

Scientific Publications: 1936

Presentations: 4251

 

Personnel

Funding Agencies

  • USFWS Region 8

Links

Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey