Surveying woodland raptors by broadcast of conspecific vocalizations
Journal of Field Ornithology
By: J. A. Mosher, M.R. Fuller, and M. Kopeny
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Abstract
We surveyed for raptors in forests on study areas in five of the eastern United States. For Cooper's Hawks (Accipiter cooperi), Red-shouldered Hawks (Buteo lineatus), and Barred Owls (Strix varia) the contact rates obtained by broadcasting taped vocalizations of conspecifics along roads were significantly greater than contact rates obtained by only looking and listening from the roadside. Broad-winged Hawks (B. platypterus) were detected only after their calls were broadcast. Most raptors were detected within 10 min of the beginning of the broadcasts. Red-tailed Hawks (B. jamaicensis) and Goshawks (A. gentilis) nested infrequently on our study areas, and we were unable to increase detections of these species. Generally, point count transects along woodland roads, from which conspecific vocalizations were broadcast, resulted in higher species specific detection rates than when walking, driving continuously, or only looking and listening for raptors at roadside stops.
Suggested Citation
Mosher, J.A., Fuller, M., Kopeny, M., 1990, Surveying woodland raptors by broadcast of conspecific vocalizations: Journal of Field Ornithology, v. 61, no. 4, p. 453-461.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Surveying woodland raptors by broadcast of conspecific vocalizations |
| Series title | Journal of Field Ornithology |
| Volume | 61 |
| Issue | 4 |
| Year Published | 1990 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 453-461 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Field Ornithology |
| First page | 453 |
| Last page | 461 |