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首页> 外文期刊>Estuarine Coastal and Shelf Science >The shallow benthic food web structure in the high Arctic does not follow seasonal changes in the surrounding environment
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The shallow benthic food web structure in the high Arctic does not follow seasonal changes in the surrounding environment

机译：北极高海拔地区的浅层底栖食物网结构并未跟随周围环境的季节性变化

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摘要

Seasonality, quality and quantity of food resources strongly affect fitness and survival of polar fauna. Most research conducted in polar areas has been carried out during the summer, rarely including aspects of seasonality; therefore, there are gaps in our knowledge of the structure of food webs in the Arctic, particularly information is lacking on the possible shifts in winter feeding strategies of organisms. This study is the first to compare potential shifts in benthic food-web structure between winter and summer in a shallow-water Arctic fjord (Kongsfjorden, Svalbard). Winter data were collected in March when conditions are representative of winter and when Arctic shallow benthic fauna is likely to be most affected by absence of fresh food supply as opposed to summer (August). Samples of particulate suspended organic matter (POM), settled organic matter, surface sediment and benthic organisms were taken and analyzed for stable isotopes signatures (δ~(13)C and δ~(15)N). Four relative trophic levels (TL) were distinguished in both winter and summer, and no differences in the structure of benthic food web were found between seasons. Our study shows that the shallow sublittoral benthos depends on primary production, fresh and reworked settled organic matter and, to a certain degree, on terrestrial input We also demonstrate that shallow water polar benthic fauna is characterized by a high level of omnivory and feeds at multiple trophic levels showing strong resilience to changing seasonal conditions.
机译：食物资源的季节性，质量和数量强烈影响极地动物的适应性和生存。在极地地区进行的大多数研究都是在夏季进行的，很少涉及季节性方面。因此，我们对北极食物网结构的了解尚不足，特别是缺乏有关冬季冬季生物饲养策略可能变化的信息。这项研究首次比较了北极浅水峡湾（Songbard，Kongsfjorden）冬季和夏季底栖食物网结构的潜在变化。冬季数据是在3月收集的，当时条件是冬季的代表，而与夏季（8月）相比，北极浅层底栖动物很可能受到新鲜食物供应的影响最大。采集了颗粒状悬浮有机物（POM），沉降有机物，表面沉积物和底栖生物的样品，并分析了稳定同位素特征（δ〜（13）C和δ〜（15）N）。在冬季和夏季，区分了四个相对营养水平（TL），并且在两个季节之间没有发现底栖食物网的结构差异。我们的研究表明，浅海底栖底栖动物取决于初级生产，新鲜和返工的沉降有机物，并在一定程度上取决于地面输入。我们还证明，浅水极底栖动物群的特点是杂食性较高，且饲料多营养水平显示出对不断变化的季节性条件的强韧性。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第1期|183-191|共9页
  • 作者

    Monika Kedra; Karol Kulinski; Wojciech Walkusz; Joanna Legezynska;

  • 作者单位

    Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland,Chesapeake Biological Laboratory Center for Environmental Science, University of Maryland, P.O. Box 38, Solomons, 20688 MD, USA;

    Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland;

    Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland,Department of Fisheries and Oceans, 501 University Crescent, Winnipeg, R3T 2N6, MB, Canada;

    Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    arctic; svalbard; kongsfjorden; winter; seasonality; food webs; benthos; stable isotopes;

    机译：北极;斯瓦尔巴群岛kongsfjorden;冬季;季节性食物网;便当稳定同位素;

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