| Abstract: | Using simple regression, pooled-sites route-regression, and nonparametric rank-trend analyses, we evaluated trends in counts of hawks migrating past 6 eastern hawk lookouts from 1972 to 1987. The indexing variable was the total count for a season. Bald eagle (Haliaeetus leucocephalus), peregrine falcon (Falco peregrinus), merlin (F. columbarius), osprey (Pandion haliaetus), and Cooper‘s hawk (Accipiter cooperii) counts increased using route-regression and nonparametric methods (P < 0.05). Northern harrier (Circus cyaneus) counts increased based on the nonparametric method (P < 0.01) but not the route-regression method (P > 0.10). We found no consistent trends (P > 0.10) in counts of sharp-shinned hawks (A. striatus), northern goshawks (A. gentilis) red-shouldered hawks (Buteo lineatus), red-tailed hawks (B. jamaicensis), rough-legged hawsk (B. lagopus), and American kestrels (F. sparverius). Broad-winged hawk (B. platypterus) counts declined (P < 0.05) based on the route-regression method. Empirical comparisons of our results with those for well-studied species such as the peregrine falcon, bald eagle, and osprey indicated agreement with nesting surveys. We suggest that counts of migrant hawks are a useful and economical method for detecting long-term trends in species across regions, particularly for species that otherwise cannot be easily surveyed. |
| Genre: | Article |
| ProdID: | 5222407 |
| Citation Author: | Titus, K.; Fuller, M.R. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 470 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Wildlife Management |
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| Citation Number Of Pages: | 8 |
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| Citation Phsyical Description: | 463-470 |
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| Citation Search Results Text: | Recent trends in counts of migrant hawks from northeastern North America; 1990; Article; Journal; Journal of Wildlife Management; Titus, K.; Fuller, M.R. |
| Citation Start Page: | 463 |
| Citation Volume: | 54 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Recent trends in counts of migrant hawks from northeastern North America; 1990; Article; Journal; Journal of Wildlife Management; Titus, K.; Fuller, M.R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.jstor.org/stable/3809660 |
| Date Other: | Wed, 16 Jun 2010 12:19 -0500 |
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