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The relationship between body mass and survival of wintering canvasbacks

Auk

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Abstract

Mass and recapture histories of 6,000 Canvasbacks (Aythya valisineria ) banded in upper Chesapeake Bay were used to test two hypotheses: (1) early-winter body mass is associated with the probability of surviving the winter, and (2) early-winter body mass is associated with annual survival probability. Results for adult males, which provided the largest data sets, presented strong evidence that birds with high relative early-winter masses had both greater overwinter and annual survival probabilities. Results of overwinter analyses necessarily are qualified by the alternative explanation of mass-dependent emigration, i.e. the possibility that lighter birds move south in response to cold weather and leave only heavy birds for recapture. Such a phenomenon remains to be documented.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The relationship between body mass and survival of wintering canvasbacks
Series title:
Auk
Volume
103
Issue:
3
Year Published:
1986
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
506-514
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
506
Last page:
514
Number of Pages:
9