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A retrospective perspective: evaluating population changes by repeating historic bird surveys

General Technical Report GTR-PSW-191

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Abstract

Acquiring an accurate picture of the changes in bird populations often involves a tradeoff between the time and effort required to complete the surveys and the number of years spent surveying the bird populations. An alternative approach to long-term monitoring efforts is to collect current data and contrast those with data collected earlier in a similar fashion on the same study site(s). To evaluate changes in bird populations, we repeated two extensive surveys, one in North Dakota (1967 vs. 1992-1993) and the other in the Platte River Valley of Nebraska (1979-1980 vs. 2001), where large areas of native vegetation had been converted to agriculture. We use these examples and others from the literature to illustrate the advantages and disadvantages of using historical data as a frame of reference for population changes.

Additional Publication Details

Publication type:
Report
Publication Subtype:
Federal Government Series
Title:
A retrospective perspective: evaluating population changes by repeating historic bird surveys
Series title:
General Technical Report
Series number:
GTR-PSW-191
Year Published:
2005
Language:
English
Publisher:
U.S. Forest Service
Publisher location:
Albany, CA
Contributing office(s):
Northern Prairie Wildlife Research Center
Description:
p. 817-830
Larger Work Type:
Report
Larger Work Subtype:
Federal Government Series
Larger Work Title:
Bird Conservation Implementation and Integration in the Americas: Proceedings of the Third International Partners in Flight Conference
First page:
817
Last page:
830
Number of Pages:
14