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Impact of Winter Stress on Mallard Body Composition
Richard J. Whyte and Eric G. Bolen
Vol. 86, No. 4 (Nov., 1984), pp. 477-482
Published by: Cooper Ornithological Society
Stable URL: http://www.jstor.org/stable/1366830
Page Count: 6
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Adult Mallards wintering on the Southern High Plains of Texas lost weight and lipid reserves during and after periods of cold, stressful weather between December and February. Cold fronts and snowfall in November, when feeding conditions were best, did not affect gains in lipid and body weights. Protein levels were unaffected at all times. Survival potentials were estimated to be more or less equal among adult males and females and juvenile drakes at 0°C, -10°C, and -20°C. Juvenile hens had the lowest survival potentials at the three temperatures.
The Condor © 1984 Cooper Ornithological Society