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首页> 外文期刊>Marine biology >Blubber fatty acids reveal variation in the diet of male Australian fur seals
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Blubber fatty acids reveal variation in the diet of male Australian fur seals

机译:脂族脂肪酸揭示了雄性澳大利亚海狗的饮食变化

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摘要

Top-order predators play an important role in the structure and function of marine ecosystems. Optimal foraging theory predicts that predators will utilise foraging strategies that maximise their net energetic intake, and consequently, individuals within a population may utilise alternate strategies to target different prey resources. The present study investigated variation within the diet of 41 male Australian fur seals (Arctocephalus pusillus doriferus) using quantitative fatty-acid signature analysis (QFASA) of blubber. The study was conducted during the pre-breeding seasons of 2012 and 2013 and the non-breeding seasons of 2013 and 2014 at a colony on Kanowna Island (39 degrees 10 ' S, 146 degrees 18 ' E) in northern Bass Strait, southeastern Australia. QFASA models revealed that while males consumed prey commonly reported within the diet of Australian fur seals, elasmobranchs were more important than previously reported. Prey composition also varied between males which may reflect individuals using different strategies to target different resources, which ultimately broadens the trophic niche of a species and reduces intra-specific competition. Furthermore, substantial temporal variation in male diet was apparent presumably reflecting variation in the distribution, availability, and abundance of prey resources within Bass Strait at the time of sampling. Given that the energetic content of prey is expected to differ between species, temporal variation in dietary composition presumably has important implications for the growth and reproductive success of males.
机译:顶级捕食者在海洋生态系统的结构和功能中起着重要作用。最佳觅食理论预测,掠食者将利用觅食策略来最大化其净能量摄入,因此,种群中的个体可能会利用替代策略来针对不同的猎物资源。本研究使用定量的脂肪酸脂特征分析(QFASA)研究了41只澳大利亚海狗(Arctocephalus pusillus doriferus)的饮食变化。该研究是在2012年和2013年的繁殖前季节以及2013年和2014年的非繁殖季节期间,在澳大利亚东南部巴斯海峡北部的Kanowna岛上的一个殖民地(南纬10度,东经146度,146度)进行的。 。 QFASA模型显示,尽管雄性食用澳大利亚海狗饮食中普遍报道的猎物,但弹性分支比以前报道的更为重要。雄性之间的猎物组成也有所不同,这可能反映出使用不同策略来针对不同资源的个体,这最终扩大了物种的营养位,并减少了种内竞争。此外,在男性饮食中,时间的明显变化很明显,可能反映了采样时巴斯海峡内猎物资源的分布,可用性和丰富性的变化。考虑到猎物的能量含量在不同物种之间会有所不同,因此饮食组成的时间变化可能对雄性的生长和生殖成功具有重要意义。

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  • 来源
    《Marine biology》 |2019年第9期|117.1-117.11|共11页
  • 作者单位

    Deakin Univ Sch Life & Environm Sci Burwood Campus Geelong Vic 3220 Australia;

    Deakin Univ Sch Life & Environm Sci Burwood Campus Geelong Vic 3220 Australia|South Atlantic Environm Res Inst Stanley FIQQ1ZZ Falkland Island|Macquarie Univ Dept Biol Sci Sydney NSW 2109 Australia;

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  • 正文语种 eng
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