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- W2170348519 abstract "Abstract The aim of this study was to determine the trophic level, trophic breadth, and dietary overlap of two species of otariids ( Zalophus californianus and Arctocephalus philippii townsendi ) at the San Benito Islands in Baja California, Mexico, using scat analysis, and stable isotope analyses ( SIA ) of carbon and nitrogen in pup hair and dental collagen. Scat samples were collected during summer and winter. The most important prey for both species during summer was squid, comprising 74% of the A. p. townsendi diet and 45% of that of Z. californianus . In winter, squid was 87% of the A. p. townsendi diet, whereas fish was the predominant food (76%) for Z. californianus . Both species were specialist feeders and reached maximum trophic overlap during the summer ( C H = 0.9). SIA of the hair of otariid pups showed significant differences in δ 15 N ( P = 0.001), coinciding with A. p. townsendi 's greater consumption of squid. The average δ 13 C value was significantly lower for A. p. townsendi (−16.3‰ ± 0.2‰), reflecting the species' consumption of squid from pelagic habitats, whereas that of Z. californianus (−15.9‰ ± 0.3‰) was significantly higher, reflecting their consumption of benthic fish. Difference in habitat use was confirmed in δ 13 C values of dental collagen." @default.
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- W2170348519 date "2015-09-25" @default.
- W2170348519 modified "2023-10-04" @default.
- W2170348519 title "Niche overlap and habitat use at distinct temporal scales among the California sea lions<i>(Zalophus californianus</i>) and Guadalupe fur seals (<i>Arctocephalus philippii townsendi</i>)" @default.
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- W2170348519 doi "https://doi.org/10.1111/mms.12274" @default.
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