| 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. |
| Genre: | Article |
| ProdID: | 5221838 |
| Citation Author: | Moore, K.R.; Henny, C.J. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 76 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Raptor Research |
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| Citation Number Of Pages: | 12 |
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| Citation Phsyical Description: | 65-76 |
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| Citation Search Results Text: | Nest site characteristics of three coexisting Accipiter hawks in northeastern Oregon; 1983; Article; Journal; Raptor Research; Moore, K.R.; Henny, C.J. |
| Citation Start Page: | 65 |
| Citation Volume: | 17 |
| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | Nest site characteristics of three coexisting Accipiter hawks in northeastern Oregon; 1983; Article; Journal; Raptor Research; Moore, K.R.; Henny, C.J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 16 Jun 2010 12:18 -0500 |
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