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A quantitative approach to identifying predators from nest remains

Journal of Field Ornithology

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Abstract

Nesting success of Dusky Canada Geese (Branta canadensis occidentalis) has declined greatly since a major earthquake affected southern Alaska in 1964. To identify nest predators, we collected predation data at goose nests and photographs of predators at natural nests containing artificial eggs in 1997-2000. To document feeding behavior by nest predators, we compiled the evidence from destroyed nests with known predators on our study site and from previous studies. We constructed a profile for each predator group and compared the evidence from 895 nests with unknown predators to our predator profiles using mixture-model analysis. This analysis indicated that 72% of destroyed nests were depredated by Bald Eagles and 13% by brown bears, and also yielded the probability that each nest was correctly assigned to a predator group based on model fit. Model testing using simulations indicated that the proportion estimated for eagle predation was unbiased and the proportion for bear predation was slightly overestimated. This approach may have application whenever there are adequate data on nests destroyed by known predators and predators exhibit different feeding behavior at nests.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A quantitative approach to identifying predators from nest remains
Series title:
Journal of Field Ornithology
Volume
75
Issue:
1
Year Published:
2004
Language:
English
Contributing office(s):
Alaska Biological Science Center
Description:
pp. 40-48
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Field Ornithology
First page:
40
Last page:
48
Number of Pages:
9