Supplementary material from "Living on the edge of a shrinking habitat: the ivory gull, Pagophila eburnea, an endangered sea-ice specialist"
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The ongoing decline of sea ice threatens many Arctic taxa, including the ivory gull. Understanding how ice-edges and ice concentrations influence the distribution of the endangered ivory gulls is a prerequisite to the implementation of adequate conservation strategies. From 2007 to 2013, we used satellite transmitters to monitor the movements of 104 ivory gulls originating from Canada, Greenland, Svalbard-Norway and Russia. Although half of the positions were within 41km of the ice-edge (75% within 100km), approximately 80% were on relatively high concentrated sea ice. Ivory gulls used more concentrated sea ice in summer, when close to their high-Arctic breeding ground, than in winter. The best model to explain the distance of the birds to the ice-edge included the ice concentration within approximately 10km, the month and the distance to the colony. Given the strong links between ivory gull, ice-edge and ice concentration, its conservation status is unlikely to improve in the current context of sea-ice decline which, in turn, will allow anthropic activities to develop in regions that are particularly important for the species.
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Gilg, Olivier; Istomina, Larysa; Heygster, Georg; Strøm, Hallvard; Gavrilo, Maria V.; Mallory, Mark L.; et al. (2016). Supplementary material from "Living on the edge of a shrinking habitat: the ivory gull, Pagophila eburnea, an endangered sea-ice specialist". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.3517344.v1