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首页> 外文期刊>Polar biology >Feeding ecology of capelin (Mallotus villosus) in a fjord impacted by glacial meltwater (Godthabsfjord, Greenland)
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Feeding ecology of capelin (Mallotus villosus) in a fjord impacted by glacial meltwater (Godthabsfjord, Greenland)

机译：受冰河融水影响的峡湾中的毛鳞鱼（Mallotus villosus）的进食生态

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摘要

Capelin (Mallotus villosus) is an important trophic node in many Arctic and sub-Arctic ecosystems. In Godthabsfjord, West Greenland, the zooplankton community has been shown to change significantly from the inner part of the fjord, which is impacted by several glaciers to the shelf outside the fjord. To what extent this gradient in zooplankton composition influences capelin diet during their summer feeding in the fjord is yet unknown. To investigate this, we analysed stomach content of capelin (8-14cm) sampled using a pelagic trawl at three stations in outer (GF3), mid (GF7) and inner (GF10) part of Godthabsfjord in May and August 2013. In May, the copepod nauplii numerically dominated the diets, but euphausiids contributed 92% by carbon mass at all stations. In August, calanoid copepods were the most important prey numerically and by carbon mass. Smaller copepod species became more important towards the inner stations, whereas the large Calanus species dominated in the outer stations. There was also a trend in decreasing stomach carbon content towards the inner stations, and on the individual level, variation in stomach content was strongly negatively related to the proportion of small copepods in the diet. This suggests that the inclusion of small copepods in the diet cannot compensate for the absence of larger euphausiids and copepods. Therefore, any change in the ecosystems that favours these at the expense of larger zooplankton and euphausiids is likely to impact capelin feeding negatively with consequences for the whole ecosystem.
机译：在许多北极和亚北极生态系统中，毛鳞鱼（Mallotus villosus）是重要的营养节点。在西格陵兰的哥达布斯峡湾，浮游动物群落已从峡湾的内部发生显着变化，受到峡湾外部冰川的影响。浮游动物组成的这种梯度在多大程度上影响了峡湾夏季进食期间毛鳞鱼的饮食，目前尚不清楚。为了对此进行调查，我们于2013年5月和2013年8月在哥德堡峡湾的外部（GF3），中部（GF7）和内部（GF10）的三个站点分析了使用浮游拖网采样的毛鳞鱼的胃内容物（8-14cm）。 co足类无节幼体在数量上占主导地位，但在所有站位中，长足纲动物贡献的碳质量> 92％。从数量和碳质量上看，八月类an足类动物是最重要的猎物。较小的pe足类对内部站变得越来越重要，而大型的alan足类在外部站占主导。胃内碳含量也朝着内部站降低，并且在个体水平上，胃中含量的变化与饮食中小co足类的比例有很大的负相关。这表明在饮食中加入小co足类动物不能弥补较大的e虾和co足类动物的缺乏。因此，任何有利于生态系统的生态系统变化，都会以较大的浮游动物和浮游生物为代价，从而对毛鳞鱼的摄食产生负面影响，给整个生态系统带来后果。

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  • 来源
    《Polar biology》 |2019年第1期|81-98|共18页
  • 作者

    Gronkjaer Peter; Nielsen Kasper Vibsig; Zoccarato Giacomo; Meire Lorenz; Rysgaard Soren; Hedeholm Rasmus Berg;

  • 作者单位

    Aarhus Univ, Aquat Biol, Dept Biosci, DK-8000 Aarhus, Denmark;

    Aarhus Univ, Aquat Biol, Dept Biosci, DK-8000 Aarhus, Denmark;

    Aarhus Univ, Aquat Biol, Dept Biosci, DK-8000 Aarhus, Denmark|Univ Pavia, Dept Earth & Environm Sci, Pavia, Italy;

    Greenland Inst Nat Resources, GCRC, Nuuk 3900, Greenland|NIOZ Royal Netherlands Inst Sea Res, Dept Estuarine & Delta Syst, Yerseke, Netherlands|Univ Utrecht, Yerseke, Netherlands;

    Aarhus Univ, Arctic Res Ctr, Dept Biosci, DK-8000 Aarhus, Denmark|Greenland Inst Nat Resources, Nuuk 3900, Greenland|Univ Manitoba, CHR Fac Environm Earth & Resources, Ctr Earth Observat Sci, Winnipeg, MB R3T 2N2, Canada;

    Greenland Inst Nat Resources, Nuuk 3900, Greenland;

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  • 正文语种 eng
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  • 关键词

    Capelin; Zooplankton; Diet; Glacial meltwater; Greenland; Climate;

    机译：毛鳞鱼;卓普兰克顿;饮食;冰川融水;格陵兰;气候;

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