Stable isotopes reveal inter-annual and inter-individual variation in the diet of female Australian fur seals
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منابع مشابه
Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands
Trophic interactions between organisms are the main drivers of ecosystem dynamics, but scant dietary information is available for wide-ranging predators during migration. We investigated feeding habits of a key consumer of the Southern Ocean, the southern elephant seal Miroungia leonina, by comparing its blood δ13C and δ15N values with those of various marine organisms, including crustaceans, s...
متن کاملUtilisation of Intensive Foraging Zones by Female Australian Fur Seals
Within a heterogeneous environment, animals must efficiently locate and utilise foraging patches. One way animals can achieve this is by increasing residency times in areas where foraging success is highest (area-restricted search). For air-breathing diving predators, increased patch residency times can be achieved by altering both surface movements and diving patterns. The current study aimed ...
متن کاملLong-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers
BACKGROUND Individual variations in the use of the species niche are an important component of diversity in trophic interactions. A challenge in testing consistency of individual foraging strategy is the repeated collection of information on the same individuals. METHODOLOGY/PRINCIPAL FINDINGS The foraging strategies of sympatric fur seals (Arctocephalus gazella and A. tropicalis) were examin...
متن کاملWhisker isotopic signature depicts migration patterns and multi-year intra- and inter-individual foraging strategies in fur seals.
The movement and dietary history of individuals can be studied using stable isotope records in archival keratinous tissues. Here, we present a chronology of temporally fine-scale data on the trophic niche of otariid seals by measuring the isotopic signature of serially sampled whiskers. Whiskers of male Antarctic fur seals breeding at the Crozet Islands showed synchronous and regular oscillatio...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 2011
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps08933