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Influence of Ingested Lead on Body Mass of Wintering Canvasbacks
William L. Hohman, Ronald D. Pritchert, Richard M. Pace III, Dennis W. Woolington and Robert Helm
The Journal of Wildlife Management
Vol. 54, No. 2 (Apr., 1990), pp. 211-215
Stable URL: http://www.jstor.org/stable/3809031
Page Count: 5
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We determined the prevalence of lead shotgun pellets in gizzards of canvasbacks (Aythya valisineria) collected at Catahoula Lake and the Mississippi River Delta, Louisiana, during winter 1987-88 to assess the influence of ingested lead shot on canvasback body mass. The prevalence of ingested lead shot was significantly higher at Catahoula Lake (27%) than at the Mississippi River Delta (4%). Canvasbacks collected at Catahoula Lake showed significant differences in prevalence of ingested lead shot by age and month. We attributed age-related and seasonal variations to differences in foraging effort and exposure time. Body mass of canvasbacks at Catahoula Lake, after accounting for age, monthly variation, and body size, was significantly reduced (120 g or 10%) in birds that had lead shot in their gizzards.
The Journal of Wildlife Management © 1990 Wiley