Data from: Sex-specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning ...

• Main Authors: Duijns, Sjoerd, Van Gils, Jan A., Spaans, Bernard, Ten Horn, Job, Brugge, Maarten, Piersma, Theunis
• Format: Dataset
• Language: English
• Published: Dryad 2014
• Subjects: Limosa lapponica; bar-tailed godwit; Resource partitioning; Bergmann’s rule; Arctic
• Online Access: https://dx.doi.org/10.5061/dryad.71ds5; https://datadryad.org/stash/dataset/doi:10.5061/dryad.71ds5

Sexual size dimorphism (SSD) implies correlated differences in energetic requirements and feeding opportunities, such that sexes will face different trade-offs in habitat selection. In seasonal migrants, this could result in a differential spatial distribution across the wintering range. To identify the ecological causes of sexual spatial segregation, we studied a sexually dimorphic shorebird, the bar-tailed godwit Limosa lapponica, in which females have a larger body and a longer bill than males. With respect to the trade-offs that these migratory shorebirds experience in their choice of wintering area, northern and colder wintering sites have the benefit of being closer to the Arctic breeding grounds. According to Bergmann's rule, the larger females should incur lower energetic costs per unit of body mass over males, helping them to winter in the cold. However, as the sexes have rather different bill lengths, differences in sex-specific wintering sites could also be due to the vertical distribution of ... : datafile 1Basic datafile, with counts per sex and area, including the summary of benthic biomassdatafile 2Datafile of the abdominal profile scores of male and female bar-tailed godwits per area. The costs of wintering are also includeddatafile 3Summary of calculated costs of wintering and flying to and from their different wintering sites, separated per sex ...