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Factors affecting detection of American woodcock on singing-ground surveys


September 2007 - December 2011


We are assessing factors that influence the reliability and precision of Singing-ground Surveys to estimate American woodcock population trends.

Project Objectives:

1) Estimating detectability of woodcock using current sampling protocols:
repeated (occupancy) sampling of a subsample of routes
assessing detectability based on video or telemetry to refine conditions under which woodcock are detectable
double observer assessment of detectability and observer variability
repeating survey routes to assess detection probability through time
(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.

Research Products and Activities


  • 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  | 


  • 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.

Current Staff

Federal Staff: 99

Masters Students: 225

Phd Students: 143

Post Docs: 53

University Staff: 247

5 Year Summary

Students graduated: 658

Scientific Publications: 1872

Presentations: 4186



Funding Agencies

  • USFWS Region 8


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey