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Impact of Winter Stress on Mallard Body Composition

Richard J. Whyte and Eric G. Bolen
The Condor
Vol. 86, No. 4 (Nov., 1984), pp. 477-482
DOI: 10.2307/1366830
Stable URL: http://www.jstor.org/stable/1366830
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Impact of Winter Stress on Mallard Body Composition
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Abstract

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.

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