Sex differences in body size and body condition in breeding Temminck’s Stints Calidris temminckii
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There have been very few reports of body size measurements of live Temminck’s Stints, but earlier studies have shown sex differences in body mass and tarsus length. Here we use molecular techniques to determine the sex of Temminck’s Stints from a Norwegian breeding population. In total, we report measurements of body weight, wing length, tarsus length, bill length, skull length and keel length from 17 males and 30 females. We found significant sex differences in all of these variables, with the exception of tarsus length. The differences in skull length disappeared after the bill lengths had been subtracted from the measurements. A discriminant function analysis based on wing length and bill length correctly classified 86% of the cases (12/16 males, 25/27 females). Female Temminck’s Stints are known to regularly lay more than one clutch of eggs per season and could therefore be expected to be physiologically deprived of bodily energy stores. Nevertheless, we found females to be in better body condition than males.
KeywordsBody condition Body size Discriminant function analysis Molecular sexing Shorebirds
We are grateful to Jan Lindström for help with the statistical analyses and an anonymous referee for comments on a previous version of the manuscript. TL was funded by the Research Council of Norway (project no. 138734/410), a Marie Curie fellowship from the European Commission (ref. no. 41756) and grants from the Norwegian Directorate of Nature Management and the Norwegian Ornithological Society. The methods in this study are in compliance with current Norwegian law.
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