期刊
MARINE BIOLOGY
卷 158, 期 10, 页码 2199-2208出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00227-011-1725-4
关键词
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资金
- Natural Environment Research Council
- NERC [EK50-5/02]
- NERC [NBAF010001, bas0100025] Funding Source: UKRI
- Natural Environment Research Council [NBAF010001, bas0100025] Funding Source: researchfish
Considerable attention has focused on inter- and intraspecific variation in trophic niches of marine predators. Although this has revealed evidence for sexual segregation in distribution in some species, few studies have been able to address sex-related dietary specialisation. Stable isotope analysis of blood cells collected from albatrosses and petrels at South Georgia during chick-rearing indicated a difference in delta C-13,suggesting that females fed to the north of males, only in two species with male-biased sexual size dimorphism; in no species did sexes differ in trophic level (delta N-15). Based on a wider review, significant differences between sexes in isotope signatures were much more common in seabirds during the pre-laying or breeding than the nonbreeding period, presumably reflecting greater between-sex partitioning of resources when foraging ranges are more constrained and competition is greater. Sex differences, or their absence, were usually consistent across successive stages during the pre-laying and breeding periods, but not necessarily year-round nor between populations. Significant differences in isotope signatures between males and females were extremely rare in monomorphic species, suggesting a link between sexual size dimorphism and segregation in diet or distribution. Among the Southern Ocean albatrosses, sex differences in delta C-13 suggested the underlying mechanism was related to habitat specialisation, whereas in other size-dimorphic taxa (both male-and female-biased), sex differences were more common in delta N-15 than delta C-13 and therefore more consistent with size-mediated competitive exclusion or dietary specialisation.
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