Population trends of the loggerhead shrike from the North American Breeding Bird Survey
Held 11-15 January 1993, Archbold Biological Station, Lake Placid, FL.
Edited by: Reuven Yosef and Fred E. Lohrer
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Abstract
North American Breeding Bird Survey data indicated a general decline in Loggerhead Shrike (Lanius ludovicianus) populations during 1966-1993. At the continental level, shrikes declined at an average rate of 2.9% per year. Average rates of regional declines varied from 2.5-3.4% annually. These declines were prevalent in most states, provinces, and physiographic strata. Only the Edwards Plateau, High Plains, and Great Plains Roughlands strata, and Colorado, Louisiana, Montana, and South Dakota apparently have stable breeding populations. Severe winter weather during 1976-1979 may have contributed to this decline in the eastern half of the continent, combining with other factors during the winter and breeding seasons that have been implicated in the rangewide decline of this species.
Suggested Citation
Peterjohn, B., and Sauer, J., 1995, Population trends of the loggerhead shrike from the North American Breeding Bird Survey, chap. of Shrikes (Laniidae) of the World: Biology and Conservation. Proceedings of the First International Shrike Symposium, p. 117-121.
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Population trends of the loggerhead shrike from the North American Breeding Bird Survey |
| Year Published | 1995 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | ix, 343 |
| Larger Work Type | Book |
| Larger Work Subtype | Other Government Series |
| Larger Work Title | Shrikes (Laniidae) of the World: Biology and Conservation. Proceedings of the First International Shrike Symposium |
| First page | 117 |
| Last page | 121 |