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Community structure of under-ice fauna in relation to winter sea-ice habitat properties from the Weddell Sea

机译：与威德尔海冬季海冰栖息地特性相关的冰下动物群落结构

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摘要

Climate change-related alterations of Antarctic sea-ice habitats will significantly impact the interaction of ice-associated organisms with the environment, with repercussions on ecosystem functioning. The nature of this interaction is poorly understood, particularly during the critical period of winter-spring transition. To investigate the role of sea-ice and underlying water-column properties in structuring under-ice communities during late winter/early spring, we used a Surface and Under Ice Trawl to sample animals and environmental properties in the upper 2-m layer under the sea ice in the northern Weddell Sea from August to October 2013. The area of investigation was largely homogeneous in terms of hydrography and sea-ice coverage. We hypothesised that this apparent homogeneity in the physical regime was mirrored in the structure of the under-ice community. The under-ice community was numerically dominated by the copepods Stephos longipes, Ctenocalanus spp. and Calanus propinquus (altogether 67 %), and furcilia larvae of Antarctic krill Euphausia superba (30 %). In spite of the apparent homogeneity of the environment, abundance and biomass distributions at our sampling stations indicated the presence of three community types, following a geographical gradient in the investigation area: (1) high biomass, krill-dominated in the west, (2) high abundance, copepod-dominated in the east, and (3) low abundance, low biomass at the ice edge. Combined analysis with environmental data indicated that under-ice community structure was correlated with sea-ice coverage, chlorophyll a concentration, and bottom depth. The heterogeneity of the Antarctic under-ice community was probably also driven by other factors, such as advection, sea-ice drift, and seasonal progression. The response of under-ice communities to changing sea-ice habitats may thus considerably vary seasonally and regionally.
机译：与气候变化有关的南极海冰栖息地的变化将极大地影响与冰相关的生物与环境的相互作用，并对生态系统的功能产生影响。人们对这种相互作用的性质了解甚少，尤其是在冬春季过渡的关键时期。为了研究冬末/初春期间海冰和潜在的水柱属性在构造冰下群落中的作用，我们使用了表面拖网和冰底拖网对动物和环境下2米层的环境属性进行采样。 2013年8月至2013年10月，在北部韦德海中发现了海冰。就水文学和海冰覆盖率而言，调查区域在很大程度上是同质的。我们假设，在体态方面这种明显的同质性反映在冰下社区的结构中。在冰上群落中，numerical足类Stephos longipes Ctenocalanus spp在数量上占主导地位。和南极磷虾Euphausia superba的糠fur幼虫（共67％）和糠fur幼虫（占30％）。尽管环境存在明显的同质性，但在我们的采样站中，丰富的生物量分布表明在调查区域中存在三种群落类型，遵循地理梯度：（1）高生物量，在西部以磷虾为主，（2 ）高丰度，co足类动物在东部占主导地位；（3）低丰度，冰缘生物量低。结合环境数据进行的分析表明，冰下群落结构与海冰覆盖率，叶绿素a浓度和海底深度有关。南极冰下群落的异质性也可能受其他因素驱动，例如对流，海冰漂移和季节性变化。因此，冰下社区对不断变化的海冰生境的反应在季节和区域上可能有很大差异。

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  • 来源
    《Polar biology》 |2017年第2期|247-261|共15页
  • 作者

    David Carmen; Schaafsma Fokje L.; van Franeker Jan Andries; Lange Benjamin; Brandt Angelika; Flores Hauke;

  • 作者单位

    Helmholtz Zentrum Polar & Meeresforsch AWI, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany|Univ Hamburg, Ctr Nat Hist CeNak, Zool Museum, Martin Luther King Pl 3, D-20146 Hamburg, Germany;

    Inst Marine Res & Ecosyst Studies Wageningen UR I, POB 57, NL-1781 AG Den Helder, Netherlands;

    Inst Marine Res & Ecosyst Studies Wageningen UR I, POB 57, NL-1781 AG Den Helder, Netherlands;

    Helmholtz Zentrum Polar & Meeresforsch AWI, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany|Univ Hamburg, Ctr Nat Hist CeNak, Zool Museum, Martin Luther King Pl 3, D-20146 Hamburg, Germany;

    Univ Hamburg, Ctr Nat Hist CeNak, Zool Museum, Martin Luther King Pl 3, D-20146 Hamburg, Germany;

    Helmholtz Zentrum Polar & Meeresforsch AWI, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany|Univ Hamburg, Ctr Nat Hist CeNak, Zool Museum, Martin Luther King Pl 3, D-20146 Hamburg, Germany;

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  • 正文语种 eng
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  • 关键词

    Southern Ocean; Sea ice; Antarctic krill Euphausia superba; Stephos longipes; Ctenocalanus; Zooplankton; Biomass; Diversity;

    机译：南大洋;海冰;南极磷虾Euphausia superba;Stephos longipes;Ctenocalanus;Zooplankton;生物量;多样性;

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