Abstract
In total, 1406 samples of scat of 19 arctic fox families and 1755 prey remains collected near the dens of 32 families during the cub rearing period were analyzed. This is the first attempt to evaluate the food use in the population according to averaged data for a large number of families. After the population had passed through the bottleneck, the arctic fox diet changed considerably. Colonies of petrels—the northern fulmar Fulmarus glacialis rodgersii and the storm-petrels Oceanodroma furcata and O. leucorhoa—became the main food source, whereas the use of alternative resources (alcids, cormorants, marine invertebrates, and otarid rookery products) decreased considerably. The following factors are assumed to determine the arctic fox foraging strategy, i.e., the selectivity in food acquisition: (1) passing of the population through the bottleneck; (2) termination of anthropogenic influence due to the liquidation of human settlements on the island; (3) decrease in both the bird populations and abundance of marine invertebrates (sea urchins and mussels); and (4) stable low density of the current arctic fox population. A hypothetical scenario for formation of the foraging specialization in the island population is discussed.
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Original Russian Text © M.E. Goltsman, O.G. Nanova, S.N. Sergeev, A.N. Shienok, 2010, published in Zoologicheskii Zhurnal, 2010, No. 10, pp. 1246–1263.
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Goltsman, M.E., Nanova, O.G., Sergeev, S.N. et al. The food habits of arctic fox (Alopex lagopus semenovi) reproductive families on mednyi island (Commander Islands). Biol Bull Russ Acad Sci 38, 709–725 (2011). https://doi.org/10.1134/S1062359010151014
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DOI: https://doi.org/10.1134/S1062359010151014