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首页> 外文期刊>Polar biology >Terrestrial and marine trophic pathways support young-of-year growth in a nearshore Arctic fish
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Terrestrial and marine trophic pathways support young-of-year growth in a nearshore Arctic fish

机译：陆地和海洋营养通道支持了近岸北极鱼的年幼生长

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摘要

River discharge supplies nearshore communities with a terrestrial carbon source that is often reflected in invertebrate and fish consumers. Recent studies in the Beaufort Sea have documented widespread terrestrial carbon use among invertebrates, but only limited use among nearshore fish consumers. Here, we examine the carbon source and diet of rapidly growing young-of-year Arctic cisco (Coregonus autumnalis) using stable isotope values (δ~(13)C and δ~(15)N) from muscle and diet analysis (stomach contents) during a critical and previously unsampled life stage. Stable isotope values (δ~(15)N and δ~(l3)C) may differentiate between terrestrial and marine sources and integrate over longer time frames (weeks). Diet analysis provides species-specific information, but only from recent foraging (days). Average δ~(13)C for all individuals was -25.7 ‰, with the smallest individuals possessing significantly depleted δ~(13)C values indicative of a stronger reliance of terrestrial carbon sources as compared to larger individuals. Average δ~(15)N for all individuals was 10.4 ‰, with little variation among individuals. As fish length increased, the proportion of offshore Calanus prey and neritic Mysis prey increased. Rapid young-of-year growth in Arctic cisco appears to use terrestrial carbon sources obtained by consuming a mixture of neritic and offshore zooplankton. Shifts in the magnitude or phenology of river discharge and the delivery of terrestrial carbon may alter the ecology of nearshore fish consumers.
机译：河流排放物为近岸社区提供了陆地碳源，这种碳源通常反映在无脊椎动物和鱼类消费者中。博福特海地区的最新研究表明，无脊椎动物中陆地碳的广泛使用，但近岸鱼类消费者中陆地碳的使用有限。在这里，我们通过肌肉和饮食分析（胃内容物）使用稳定的同位素值（δ〜（13）C和δ〜（15）N）来检查快速生长的北极北极思科（Coregonus autumnalis）的碳源和饮食。 ）处于关键且以前未采样的生命阶段。稳定的同位素值（δ〜（15）N和δ〜（l3）C）可能会区分陆源和海洋源，并在更长的时间范围（几周）内进行积分。饮食分析提供特定物种的信息，但仅来自最近的觅食（天）。所有个体的平均δ〜（13）C为-25.7‰，最小个体的δ〜（13）C值明显减少，表明与较大个体相比，陆地碳源的依赖性更大。所有个体的平均δ〜（15）N为10.4‰，个体间差异很小。随着鱼类长度的增加，近海卡纳努斯猎物和密西西斯密西西斯猎物的比例增加。北极cisco的年幼迅速增长似乎使用了陆上碳源，该碳源是通过消耗淡水和近海浮游动物的混合物获得的。河流排放的大小或物候变化以及陆地碳的输送可能会改变近岸鱼类消费者的生态。

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  • 来源
    《Polar biology》 |2013年第1期|137-146|共10页
  • 作者

    Vanessa R. von Biela; Christian E. Zimmerman; Brian R. Cohn; Jeffrey M. Welker;

  • 作者单位

    U.S. Geological Survey, Alaska Science Center,4210 University Drive, Anchorage, AK 99508, USA;

    U.S. Geological Survey, Alaska Science Center,4210 University Drive, Anchorage, AK 99508, USA;

    ENRI Stable Isotope Laboratory, Department of Biological Sciences, Environmental and Natural Resources Institute,University of Alaska Anchorage, 3211 Providence Drive,Anchorage, AK 99508, USA;

    ENRI Stable Isotope Laboratory, Department of Biological Sciences, Environmental and Natural Resources Institute,University of Alaska Anchorage, 3211 Providence Drive,Anchorage, AK 99508, USA;

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  • 正文语种 eng
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  • 关键词

    arctic; beaufort sea; carbon isotope; diet analysis; nearshore; terrestrial carbon;

    机译：北极;博福特海碳同位素饮食分析;近岸陆地碳;

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