Seasonal changes in body weight and composition of dunlin (Calidris alpina)

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Abstract
Seasonal variations in body weight and composition were studied in a population of dunlin (Calidris alpina) wintering in the Fraser River delta in 1979–1980. In December, mean body weights reached a peak of 61 and 56 g in female and male dunlin, respectively. During the next 2 months, body weight decreased 11–15% and fat depots by 61–67%. The weight and composition of migrant birds (April) were similar to the values determined in November. The linear regression relating body weight and fat (slope = 1.31, r = 0.58, P < 0.05) suggests that there is a slight relationship between weight changes and fat levels. The reduction in weight and fat resevoirs is related to adverse weather conditions and reduced prey densities.
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