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首页> 外文期刊>Polar biology >Sea-ice properties and nutrient concentration as drivers of the taxonomic and trophic structure of high-Arctic protist and metazoan communities
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Sea-ice properties and nutrient concentration as drivers of the taxonomic and trophic structure of high-Arctic protist and metazoan communities

机译：海冰的性质和养分浓度是高北极原生生物和后生动物群落分类和营养结构的驱动因素

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摘要

In the Arctic Ocean, sea-ice decline will significantly change the structure of biological communities. At the same time, changing nutrient dynamics can have similarly strong and potentially interacting effects. To investigate the response of the taxonomic and trophic structure of planktonic and ice-associated communities to varying sea-ice properties and nutrient concentrations, we analysed four different communities sampled in the Eurasian Basin in summer 2012: (1) protists and (2) metazoans from the under-ice habitat, and (3) protists and (4) metazoans from the epipelagic habitat. The taxonomic composition of protist communities was characterised with 18S meta-barcoding. The taxonomic composition of metazoan communities was determined based on morphology. The analysis of environmental parameters identified (i) a shelf-influenced' regime with melting sea ice, high-silicate concentrations and low NOx (nitrate+nitrite) concentrations; (ii) a Polar' regime with low silicate concentrations and low NOx concentrations; and (iii) an Atlantic' regime with low silicate concentrations and high NOx concentrations. Multivariate analyses of combined bio-environmental datasets showed that taxonomic community structure primarily responded to the variability of sea-ice properties and hydrography across all four communities. Trophic community structure, however, responded significantly to NOx concentrations. In three of the four communities, the most heterotrophic trophic group significantly dominated in the NOx-poor shelf-influenced and Polar regimes compared to the NOx-rich Atlantic regime. The more heterotrophic, NOx-poor regimes were associated with lower productivity and carbon export than the NOx-rich Atlantic regime. For modelling future Arctic ecosystems, it is important to consider that taxonomic diversity can respond to different drivers than trophic diversity.
机译：在北冰洋，海冰下降将大大改变生物群落的结构。同时，不断变化的营养动态可能具有类似的强大且潜在的相互作用作用。为了研究浮游和冰相关群落的分类学和营养结构对变化的海冰特性和养分含量的响应，我们分析了2012年夏季在欧亚盆地采样的四个不同群落：（1）原生生物和（2）后生动物来自冰下生境的（3）原生生物和（4）上生境的后生动物。利用18S元条形码对生物界的分类学组成进行了表征。后生动物群落的分类学组成是基于形态学确定的。对环境参数的分析确定了（i）受海冰融化，高硅酸盐浓度和低NOx（硝酸盐+亚硝酸盐）浓度影响的陆架影响； （ii）具有低硅酸盐浓度和低NOx浓度的Polar'方案； （iii）低硅酸盐浓度和高NOx浓度的Atlantic'制度。组合的生物环境数据集的多变量分析表明，分类学群落结构主要对所有四个群落的海冰特性和水文学的变化作出响应。但是，营养群落结构对NOx浓度有显着响应。在四个社区中的三个社区中，与富含NOx的大西洋地区相比，最富营养性的群体在受NOx缺乏的陆架影响和极地地区明显占优势。与富含NOx的大西洋地区相比，更具异养性，NOx缺乏地区的生产率和碳出口量较低。为了对未来的北极生态系统进行建模，重要的是要考虑到与营养多样性相比，生物分类多样性可以响应不同的驱动因素。

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  • 来源
    《Polar biology》 |2019年第7期|1377-1395|共19页
  • 作者

    Flores Hauke; David Carmen; Ehrlich Julia; Hardge Kristin; Kohlbach Doreen; Lange Benjamin A.; Niehoff Barbara; Noethig Eva-Maria; Peeken Ilka; Metfies Katja;

  • 作者单位

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany|Univ Hamburg, Zool Museum, Ctr Nat Hist CeNak, Hamburg, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany|Univ Hamburg, Zool Museum, Ctr Nat Hist CeNak, Hamburg, Germany|Inst Francais Rech Exploitat Mer Ifremer, Plouzane, France;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany|Univ Hamburg, Zool Museum, Ctr Nat Hist CeNak, Hamburg, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany|Univ Hamburg, Zool Museum, Ctr Nat Hist CeNak, Hamburg, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany|Univ Hamburg, Zool Museum, Ctr Nat Hist CeNak, Hamburg, Germany|Fisheries & Oceans Canada, Freshwater Inst, Winnipeg, MB, Canada;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany;

    Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Sect Polar Biol Oceanog, Bremerhaven, Germany|HIFMB, Oldenburg, Germany;

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  • 正文语种 eng
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  • 关键词

    Arctic Ocean; Sea ice; Community structure; Protists; Zooplankton; Under-ice fauna; Nutrients; Trophic ecology;

    机译：北极海洋;海冰;社区结构;原权;浮游动物;冰箱底部的动物区;营养成分;营养不良的生态学;

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