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- W2091869351 abstract "Waved albatrosses ( Phoebastria irrorata Salvin, 1883) forage close to their breeding grounds on Isla Española, Galápagos, during the short chick-brooding stage and make long trips to the Peruvian upwelling during incubation and chick rearing. Previous studies have suggested foraging segregation by sex: females spend more time searching than males do while foraging in the Galápagos Marine Reserve (GMR), and band recoveries suggest higher bycatch vulnerability of males in the Peruvian upwelling. We used stable isotope analysis (δ 15 N and δ 13 C) of whole blood of adult male and female albatrosses to test for intraspecific foraging segregation in this sexually dimorphic species. Analysis of serial blood samples revealed higher δ 15 N values in males, suggesting consumption of prey items of higher trophic level. We also detected seasonal variation in foraging ecology, with higher δ 15 N values at the beginning of the breeding season. Sex and regional differences in δ 13 C values were not significant, reflecting primarily pelagic foraging sites of both sexes, both in the GMR and the Peruvian upwelling. Our results provide evidence of trophic segregation, suggestive of competitive exclusion, and novel information on marine isoscape values in the Eastern Equatorial Pacific." @default.
- W2091869351 created "2016-06-24" @default.
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- W2091869351 date "2007-02-01" @default.
- W2091869351 modified "2023-09-26" @default.
- W2091869351 title "Isotopic (δ<sup>15</sup>N and δ<sup>13</sup>C) evidence for intersexual foraging differences and temporal variation in habitat use in waved albatrosses" @default.
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- W2091869351 doi "https://doi.org/10.1139/z06-202" @default.
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