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首页> 外文期刊>Marine biology >Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
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Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis

机译：通过稳定同位素分析推断，巴西南部的雄性南美海狮（Otaria flavescens）在过去的三十年中的饮食一致性

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摘要

Marine predators may undergo remarkable dietary changes through time as a result of both anthropogenic and natural changes in the environment, but this variability is often difficult to tackle and seldom incorporated into ecosystem models. This paper uses the stable isotope ratios of carbon and nitrogen in skeletal material of South American sea lions from Brazilian scientific collections to investigate whether these animals modified their diet from 1986 to 2009, as reported for other marine predators in the region. Stable isotope ratios indicated that demersal potential prey were always enriched in ~(13)C as compared with pelagic prey. Accordingly, the absence of any statistically significant correlation between stranding year and the δ~(13)C values of adult males indicated no major increase in the consumption of pelagic prey from 1986 to 2009. Likewise, the results of the mixing model SIAR revealed a mixed diet including pelagic and demersal prey, with a central role for demersal fishes throughout the whole period. Furthermore, SIAR suggested no major changes in the proportion of pelagic and demersal prey in the diet of adult male South American sea lions during the past three decades. Demersal fishes were also relevant prey for juvenile South American sea lions during the whole period, but they always consumed a larger proportion of pelagic prey than the adults did. These results suggest no major changes in the diet of male South American sea lions during the past three decades in southern Brazil, contrary to what has been reported for other to predators in the regions and for the species in northern Patagonia.
机译：由于环境的人为和自然变化，海洋捕食者可能会随着时间发生显着的饮食变化，但是这种变化通常很难解决，也很少纳入生态系统模型中。本文使用巴西科学馆藏的南美海狮骨骼材料中碳和氮的稳定同位素比，以调查这些动物从1986年至2009年是否改变了饮食，如该地区其他海洋捕食者所报道的那样。稳定的同位素比表明，与远洋鱼类相比，深海潜在鱼类始终富含〜（13）C。因此，成年男性与成年雄性的δ〜（13）C值之间没有任何统计学上的显着相关性，表明1986年至2009年上层捕食性鱼类的消费量没有显着增加。同样，SIAR混合模型的结果表明混合饲料，包括上层捕食性鱼类和海底鱼类，在整个时期内对海底鱼类具有重要作用。此外，SIAR建议在过去的三十年中，成年雄性南美海狮饮食中上层和深层猎物的比例没有重大变化。在整个时期中，海底鱼类也是南美海狮幼体的重要猎物，但它们总是消耗比成年海狮更大的比例。这些结果表明，在过去的三十年里，巴西南部的南美雄性海狮的饮食没有发生重大变化，这与该地区其他捕食者和巴塔哥尼亚北部物种的报道相反。

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  • 来源
    《Marine biology》 |2015年第2期|275-289|共15页
  • 作者

    L. Zenteno; E. Crespo; D. Vales; L. Silva; F. Saporiti; L. R. Oliveira; E. R. Secchi; M. Drago; A. Aguilar; L. Cardona;

  • 作者单位

    Department of Animal Biology and IRBIO, Faculty of Biology, University of Barcelona, Av. Diagonal, 643, 08028 Barcelona, Spain;

    Laboratory of Marine Mammals, Centro Nacional Patagonico (CENPAT-CONICET), National University of Patagonia, Brown, 3600, 9120 Puerto Madryn, Argentina;

    Laboratory of Marine Mammals, Centro Nacional Patagonico (CENPAT-CONICET), National University of Patagonia, Brown, 3600, 9120 Puerto Madryn, Argentina;

    Laboratory of Marine Mammals, Centro Nacional Patagonico (CENPAT-CONICET), National University of Patagonia, Brown, 3600, 9120 Puerto Madryn, Argentina;

    Department of Animal Biology and IRBIO, Faculty of Biology, University of Barcelona, Av. Diagonal, 643, 08028 Barcelona, Spain;

    Study Group of Aquatic Mammals of Rio Grande do Sul (GEMARS), Rua Felipe Neri 382/203, Porto Alegre, RS 90440-150, Brazil;

    Laboratorio de Ecologia e Conservacao da Megafauna Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Rio Grande, RS 96201-900, Brazil;

    Department of Ecology and Evolution, Centro Universitario Regional Este (CURE), University of the Republic (UDeLaR), C/Tacuarembo s, Maldonado, Uruguay;

    Department of Animal Biology and IRBIO, Faculty of Biology, University of Barcelona, Av. Diagonal, 643, 08028 Barcelona, Spain;

    Department of Animal Biology and IRBIO, Faculty of Biology, University of Barcelona, Av. Diagonal, 643, 08028 Barcelona, Spain;

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