Body Composition of Wintering Canvasbacks in Louisiana: Dominance and Survival Implications

I studied effects of sex, age, and month on body mass and composition of Canvasbacks (Aythya valisineria) at Catahoula Lake (CL) and the Mississippi River Delta (MRD), Louisiana, in winter 1987-1988. Size-adjusted body mass and fat varied by age, month, and site. Fat levels in immatures were greater...

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Bibliographic Details
Published in:The Condor (Los Angeles, Calif.) Calif.), 1993-05, Vol.95 (2), p.377-387
Main Author: Hohman, William L.
Format: Article
Language:English
Subjects:
Age
Animal and plant ecology
Animal behavior
Animal, plant and microbial ecology
Animals
Autoecology
Aves
Aythya valisineria
Biological and medical sciences
Birds
Body composition
Body fat
Female animals
Freshwater
Fundamental and applied biological sciences. Psychology
Lakes
Legs
Male animals
Ornithology
Physical growth
River deltas
Vertebrata
Waterfowl
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Summary:I studied effects of sex, age, and month on body mass and composition of Canvasbacks (Aythya valisineria) at Catahoula Lake (CL) and the Mississippi River Delta (MRD), Louisiana, in winter 1987-1988. Size-adjusted body mass and fat varied by age, month, and site. Fat levels in immatures were greater at MRD than at CL, but changed similarly at both sites. Adults at MRD were also fatter than those at CL in early winter, especially in December, but fat levels of all birds increased from early to late winter and were equivalent by late winter. Body protein adjusted for structural size varied by age, month, and site, and sex, month, and site. Protein levels by site were higher in adults and males than in immatures and females, but sex- and age-related differences averaged
ISSN:0010-5422
1938-5129
2732-4621
DOI:10.2307/1369360