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Diet, prey delivery rates, and prey biomass of Northern Goshawks in East-Central Arizona

Studies in Avian Biology

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Abstract

Recent concern over persistence of Northern Goshawk (Accipiter gentilis) populations in Arizona has stemmed from two long-term demography studies that report substantial yearly fluctuations in productivity and evidence of a declining population. Although many factors could be involved in changes in productivity and population declines, availability of food is one such factor. As part of a demography study on the Sitgreaves portion of the Apache-Sitgreaves National Forest in Arizona, we used remote cameras to assess diets of goshawks. Northern Goshawks preyed upon 22 species during two nesting seasons. Adult pairs tended to specialize on particular species of prey. Prey delivery rates decreased throughout the nesting season with a corresponding increase in biomass in the latter stages of the nestling and fledgling periods. Adults appeared to take larger prey as nestlings increased in age.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Diet, prey delivery rates, and prey biomass of Northern Goshawks in East-Central Arizona
Series title:
Studies in Avian Biology
Issue:
31
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Studies in Avian Biology
First page:
219
Last page:
227
Number of Pages:
9