Feeding habits of three seal species at the Danco Coast, Antarctica: a re-assessment |
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Authors: | R Casaux M L Bertolin A Carlini |
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Institution: | (1) Instituto Ant?rtico Argentino, Cerrito 1248, 1010 Buenos Aires, Argentina;(2) Consejo Nacional de Investigaciones Cient?ficas y T?cnicas (CONICET), Av. Rivadavia 1917, 1033 Buenos Aires, Argentina |
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Abstract: | The analysis of prey overlap among Weddell, Antarctic fur and leopard seals was conducted using fecal samples collected at
the Danco Coast, Antarctic Peninsula, in 1998 and 2000. The re-occurrence of prey species was moderate in samples collected
in 1998, and low in 2000, and reflects resource partitioning among seal species. Prey species that mostly co-occurred in seals’
diet were the Antarctic krill Euphausia superba, bivalves, and the myctophids Gymnoscopelus nicholsi and Electrona antarctica. A dietary similarity index of prey overlap has been calculated and demonstrates evident fluctuations in pairwise comparisons
between the seal species. The highest and lowest values of prey overlap were observed between Antarctic fur seals and leopard
seals, and between Weddell seals and leopard seals, respectively. Prey overlap between Antarctic fur seals and Weddell seals
was moderate in both seasons. |
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