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首页> 外文期刊>Polar biology >Distribution and abundance of euphausiids and pelagic amphipods in Kongsfjorden, Isfjorden and Rijpfjorden (Svalbard) and changes in their relative importance as key prey in a warming marine ecosystem
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Distribution and abundance of euphausiids and pelagic amphipods in Kongsfjorden, Isfjorden and Rijpfjorden (Svalbard) and changes in their relative importance as key prey in a warming marine ecosystem

机译：孔斯菲约登，伊斯菲约登和里普菲约登（斯瓦尔巴特群岛）的虾类和浮游类双足类动物的分布和丰富度，以及它们在变暖的海洋生态系统中作为主要猎物的相对重要性的变化

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摘要

Euphausiid (krill) and amphipod dynamics were studied during 2006-2011 by use of plankton nets in Kongsfjorden (79A degrees N) and adjacent waters, also including limited sampling in Isfjorden (78A degrees N) and Rijpfjorden (80A degrees N). The objectives of the study were to assess how variations in physical characteristics across fjord systems affect the distribution and abundance of euphausiids and amphipods and the potential for these macrozooplankton species to reproduce in these waters. The abundances of euphausiids and amphipods were higher in Kongsfjorden than in Rijpfjorden and Isfjorden, and the highest abundances were observed at the innermost stations of Kongsfjorden, where Thysanoessa inermis and Themisto libellula dominated. The Atlantic species Thysanoessa longicaudata, Meganyctiphanes norvegica and Themisto abyssorum dominated at the outside Kongsfjorden. Inter-annual and seasonal variability in abundances of euphausiids and amphipods were evident. The presence of ripe euphausiids outside Kongsfjorden indicates that they may reproduce in these areas. Mature individuals of T. abyssorum were recorded mainly outside Kongsfjorden, whereas no mature or ripe T. libellula were present in both the inner and outer parts of this fjord. If the warming trend persists, as seen during the last decade, this would favour the Atlantic/boreal euphausiid species, while Arctic species, such as the amphipod T. libellula, may decline. Euphausiids and amphipods are major food of capelin (Mallotus villosus) and polar cod (Boreogadus saida), respectively, in this region, and changes in prey abundance will likely have an impact on the feeding dynamics of these important fish species.
机译：在2006年至2011年期间，使用Kongsfjorden（北纬79度）和邻近水域的浮游生物网研究了磷虾和两栖动物的动力学，其中还包括Isfjorden（北纬78度）和Rijpfjorden（北纬80度）的有限采样。这项研究的目的是评估峡湾系统中物理特征的变化如何影响虾青鱼和两栖类动物的分布和丰富度，以及这些大型浮游动物在这些水域中繁殖的潜力。孔斯菲约登的古猿和两栖类动物的丰度高于里普峡湾和伊斯菲尤登的丰富度，在孔斯菲约登的最内层站观测到最高的丰度，那里的Thysanoessa inermis和Themisto libellula占主导地位。大西洋物种Thysanoessa longicaudata，Meganyctiphanes norvegica和Themisto abyssorum在外部的Kongsfjorden占主导地位。虾类和双足类动物数量的年际和季节变化是明显的。 Kongsfjorden以外存在成熟的euphausiids，表明它们可能在这些地区繁殖。深渊T. abyssorum的成熟个体主要记录在孔斯峡湾以外，而该峡湾的内部和外部均没有成熟或成熟的T. libellula。如果近十年来持续出现变暖趋势，这将有利于大西洋/北方的桔梗物种，而北极物种（如两栖类T. libellula）可能会减少。虾类和双足类动物分别是该地区的毛鳞鱼（极乐鱼）和极地鳕（极乐鱼）的主要食物，猎物丰富度的变化可能会影响这些重要鱼类的摄食动态。

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  • 来源
    《Polar biology》 |2016年第10期|1765-1784|共20页
  • 作者

    Dalpadado Padmini; Hop Haakon; Ronning Jon; Pavlov Vladimir; Sperfeld Erik; Buchholz Friedrich; Rey Alina; Wold Anette;

  • 作者单位

    Inst Marine Res, Box 1870, N-5817 Bergen, Norway;

    Norwegian Polar Res Inst, Fram Ctr, N-9296 Tromso, Norway;

    Inst Marine Res, Box 1870, N-5817 Bergen, Norway;

    Norwegian Polar Res Inst, Fram Ctr, N-9296 Tromso, Norway;

    Inst Marine Res, Box 1870, N-5817 Bergen, Norway|Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Expt Limnol, Alte Fischerhutte 2, D-16775 Ot Neuglobsow, Stechlin, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany;

    Inst Marine Res, Box 1870, N-5817 Bergen, Norway;

    Norwegian Polar Res Inst, Fram Ctr, N-9296 Tromso, Norway;

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  • 正文语种 eng
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  • 关键词

    Macrozooplankton; Thysanoessa; Themisto; Kongsfjorden; Arctic fjord systems; Climate effect;

    机译：Macrozooplankton;Thysanoessa;Themisto;Kongsfjorden;北极峡湾系统;气候效应;

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