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首页> 外文期刊>Polar biology >Shifts in Antarctic megabenthic structure after ice-shelf disintegration in the Larsen area east of the Antarctic Peninsula
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Shifts in Antarctic megabenthic structure after ice-shelf disintegration in the Larsen area east of the Antarctic Peninsula

机译：南极半岛东部拉森地区冰架解体后，南极大型底栖动物结构发生变化

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摘要

The aim of this study was to contribute to a general understanding of the response of the Antarctic macrobenthos to environmental variability and climate-induced changes. The change in population size of selected macrobenthic organisms was investigated in the Larsen A area east of the Antarctic Peninsula in 2007 and 2011 using ROV-based imaging methods. The results were complemented by data from the Larsen B collected in 2007 to allow a conceptual reconstruction of the environment-driven changes before the period of investigation. Both Larsen areas are characterised by ice-shelf disintegration in 1995 and 2002, respectively, as well as high inter-annual variability in sea-ice cover and oceanographic conditions. In 2007 one ascidian species, Molgula pedunculata, was abundant north and south of the stripe of remaining ice shelf between Larsen A and B. Population densities decreased drastically in the Larsen A between 2007 and 2011, coincident with the decrease in Corella eumyota, another ascidian. Among the ophiuroids, the population of deposit feeders increased, while suspension feeders halved their bundance. Current measurements indicated a northward flow between the Larsen B and Larsen A, suggesting that a major physical forcing on benthic population development comes from the South. The results demonstrate that Antarctic macrobenthic populations can exhibit dramatic population dynamics. Analyses of sea-ice dynamics, salinity, temperature and surprisingly ice-shelf disintegration history, however, did not provide any clear evidence for environmental drivers underlying the apparent changes.
机译：这项研究的目的是有助于人们对南极大型底栖动物对环境变化和气候引起的变化的反应有一个普遍的了解。使用基于ROV的成像方法，在2007年和2011年对南极半岛以东的Larsen A地区选定的大型底栖生物的种群规模变化进行了调查。该结果得到2007年Larsen B收集的数据的补充，以允许在调查期之前对环境驱动的变化进行概念上的重构。这两个拉森地区的特征分别是1995年和2002年冰架解体，以及海冰覆盖率和海洋学条件的高年际变化。 2007年，一种海生物种Molgula pedunculata在Larsen A和B之间剩余的冰架条纹的北部和南部丰富.2007年至2011年，Larsen A的种群密度急剧下降，与另一种海生科勒菌eumyota的下降相吻合。 。在蛇形类动物中，沉积饲养者的数量增加，而悬浮饲养者的种群密度减半。当前的测量结果表明，拉森B和拉森A之间向北流动，这表明对底栖种群发育的主要物理强迫来自南方。结果表明，南极大型底栖动物种群可以表现出剧烈的种群动态。然而，对海冰动力学，盐度，温度以及令人惊奇的冰架崩解历史的分析，并未为明显变化背后的环境驱动因素提供任何明确的证据。

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  • 来源
    《Polar biology》 |2013年第6期|895-906|共12页
  • 作者

    Julian Gutt; Mattias Cape; Werner Dimmler; Laura Fillinger; Enrique Isla; Verena Lieb; Tomas Lundalv; Christian Pulcher;

  • 作者单位

    Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Columbusstr., 27568 Bremerhaven, Germany;

    Scripps Institution of Oceanography, University of California,8615 Discovery Way, La Jolla, San Diego, CA 92037, USA;

    Fielax Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Schleusenstr. 14, 27568 Bremerhaven, Germany;

    Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Columbusstr., 27568 Bremerhaven, Germany;

    Institut de Ciencies del Mar-CSIC, Passeig Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

    Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Columbusstr., 27568 Bremerhaven, Germany,Christian-Albrechts-Universitat Kiel, Christian-Albrechts-Platz 4, 24118 Kiel, Germany;

    Sven Loven Centre for Marine Sciences, University of Gothenburg, 45296 Stromstad, Sweden;

    Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Columbusstr., 27568 Bremerhaven, Germany,Institut fur Biologie und Umweltwissenschaften, Carl von Ossietzky Universitat Oldenburg, Carl-von-Ossietzky-StraBe 9-11, 26129 Oldenburg, Germany;

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  • 关键词

    ascidians; ophiuroids; population growth; population collapse; climate change; interannual sea-ice dynamics; current regime;

    机译：海鞘蛇形类人口增长;人口崩溃;气候变化;年际海冰动力学;当前政权;

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