Vertical distribution of sympagic meiofauna in sea ice in the Canadian Beaufort Sea
Vertical distribution of sympagic meiofauna in sea ice in the Canadian Beaufort Sea
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加拿大波弗特海海冰中交生小型底栖动物的垂直分布
DOI：
10.1007/s00300-011-1078-y
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发表时间：
2011
期刊：
影响因子：
1.7
通讯作者：
Carnat G
中科院分区：
文献类型：
--
作者：
Marquardt M;Kramer M;Werner I;Carnat G
这是首次在阿蒙森湾(北极波弗特海东南部)确定渐近小型底栖动物垂直分布模式的研究，这些动物包括后生动物、原生动物和20μm的卵。2008年3月中旬至5月底对全海冰岩心进行了采样(环极缺陷铅系统研究)。对来自三个浮冰站和三个快速冰站的第一年冰进行了调查。此外，在13个浮冰站和5个快速冰站采集了5厘米厚的底层冰切片。后生动物群落由线虫、轮虫、桡足类、无节幼体、扁形蠕虫和少数珍稀动物如软体动物、线虫和线虫组成。冰中存在大量的卵，L−1的卵数量在50到2,188个之间，特别是线虫和桡足类。调查还发现了远洋物种Calanus Hyperboreus和Sagittaspp的卵。因此，需要进行进一步的研究，以澄清是否会有比预期更多的生物利用这一栖息地作为繁殖场所。在样品中观察到许多不同形态的原生动物，特别是纤毛纲的纤毛虫。最高的丰度总是在冰芯最低的5厘米处发现，然而，浮游小型动物并不局限于这部分冰层。小型底栖动物综合丰度介于41~4,738×10~2Ind·−~2之间，在5月上旬的快速冰层中最高。在小型底栖动物综合群落和垂直分布方面，厚冰和快速冰之间的差异并不显著，而对底层冰剖面的分析表明，两者在时间发展和具体冰类型方面存在差异。
This is the first study to determine vertical distribution patterns of sympagic meiofauna, including metazoans, protozoans and eggs >20 μm, in the Amundsen Gulf (southeastern Beaufort Sea, Arctic). Full sea-ice cores were sampled from mid of March to end of May 2008 (Circumpolar Flaw Lead system study). Investigations were performed on first-year ice from three pack- and three fast-ice stations. Additionally, 5-cm bottom-ice sections were sampled at 13 pack-ice and 5 fast-ice stations. The metazoan community was composed of nematodes, rotifers, copepods, copepod nauplii, platyhelminthes and a few rare taxa such as mollusks, cnidarians and nemerteans. High numbers of eggs, between 50 and 2,188 eggs L−1, particularly of nematodes and copepods, were present in the ice. Investigations revealed also eggs of the pelagic speciesCalanus hyperboreusandSagittaspp. within the ice, so that further research is needed to clarify whether more organisms than expected might use this habitat as a reproduction ground. Many different morphotypes of protozoans were observed in the samples, especially ciliates of the order Euplotida. The highest abundance was always found in the lowermost 5 cm of the ice cores, nevertheless sympagic meiofauna was not restricted to that part of the ice. Integrated meiofauna abundance ranged between 41 and 4,738 × 102Ind. m−2and was highest in the fast ice in early May. Differences between pack and fast ice in terms of integrated meiofauna communities and vertical distribution were not significant, while the analysis of the bottom-ice sections indicated both a temporal development and ice-type-specific differences.
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发表时间：
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