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.
Suggested Citation
Igl, L.D., Johnson, D.H., 2005, A retrospective perspective: evaluating population changes by repeating historic bird surveys: General Technical Report GTR-PSW-191, 14 p.
| 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 | 14 p. |
| 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 |