Niche overlap and habitat use at distinct temporal scales among the California sea lions (Zalophus californianus) and Guadalupe fur seals (Arctocephalus philippii townsendi)

Nereyda Pablo-Rodríguez, David Aurioles-Gamboa, Jorge L. Montero-Muñoz

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

© 2016 Society for Marine Mammalogy. 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 (CH= 0.9). SIA of the hair of otariid pups showed significant differences in δ15N (P = 0.001), coinciding with A. p. townsendi's greater consumption of squid. The average δ13C 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 δ13C values of dental collagen.
Original languageAmerican English
Pages (from-to)466-489
Number of pages417
JournalMarine Mammal Science
DOIs
StatePublished - 1 Apr 2016
Externally publishedYes

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niche overlap
pinniped
squid
habitat use
niches
collagen
habitats
hair
feces
pups
hairs
stable isotopes
summer
teeth
stable isotope
mammalogy
diet
dietary overlap
winter
fish

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title = "Niche overlap and habitat use at distinct temporal scales among the California sea lions (Zalophus californianus) and Guadalupe fur seals (Arctocephalus philippii townsendi)",
abstract = "{\circledC} 2016 Society for Marine Mammalogy. 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 (CH= 0.9). SIA of the hair of otariid pups showed significant differences in δ15N (P = 0.001), coinciding with A. p. townsendi's greater consumption of squid. The average δ13C 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 δ13C values of dental collagen.",
author = "Nereyda Pablo-Rodr{\'i}guez and David Aurioles-Gamboa and Montero-Mu{\~n}oz, {Jorge L.}",
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AU - Aurioles-Gamboa, David

AU - Montero-Muñoz, Jorge L.

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