Nest site characteristics of three coexisting Accipiter hawks in northeastern Oregon
Raptor Research
By: K.R. Moore and Charles J. Henny
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Abstract
Habitat data were evaluated at 34 Goshawk (Accipiter gentilis), 31 Cooper's Hawk (A. cooperii), and 15 Sharp-shinned Hawk (A. striatus) nest sites in coniferous forests of northeastern Oregon. Crown volume profiles indicate a strong similarity in vegetative structure at nest sites of cooperii and striatus; both commonly nest in younger successional stands than gentilis. Habitat separation of nest sites among the three species was illustrated using a stepwise discriminant analysis; 88% of all gentilis sites were correctly classified. Interspecific overlap in nest site habitat was further demonstrated using a canonical analysis of habitat variables. Nest site habitat space of gentilis is distinct and is less variable in structure than that of the other species. Cooperii preferred nesting sites with norhern aspects, whereas striatus and gentilis showed no preference. The use of mistletoe (Arceuthobium sp.) growth by cooperii for nest platforms (64% of all nests) may explain its preference for Douglas fir (Pseudotsuga menziesii) as a nesting tree. Douglas fir is most commonly parasitized by mistletoe.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Nest site characteristics of three coexisting Accipiter hawks in northeastern Oregon |
| Series title | Raptor Research |
| Volume | 17 |
| Issue | 3 |
| Year Published | 1983 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 65-76 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Raptor Research |
| First page | 65 |
| Last page | 76 |
| Google Analytic Metrics | Metrics page |