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首页> 外文期刊>Polar biology >Brackish meltponds on Arctic sea ice-a new habitat for marine metazoans
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Brackish meltponds on Arctic sea ice-a new habitat for marine metazoans

机译：北极海冰上微咸的融化-海洋后生动物的新栖息地

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Meltponds on Arctic sea ice have previously been reported to be devoid of marine metazoans due to fresh-water conditions. The predominantly dark frequently also green and brownish meltponds observed in the Central Arctic in summer 2007 hinted to brackish conditions and considerable amounts of algae, possibly making the habitat suitable for marine metazoans. Environmental conditions in meltponds as well as sympagic meiofauna in new ice covering pond surfaces and in rotten ice on the bottom of ponds were studied, applying modified techniques from sea-ice and under-ice research. Due to the very porous structure of the rotten ice, the meltponds were usually brackish to saline, providing living conditions very similar to sub-ice water. The new ice cover on the surface had similar characteristics as the bottom layer of level ice. The ponds were thus accessible to and inhabitable by metazoans. The new ice cover and the rotten ice were inhabited by various sympagic meiofauna taxa, predominantly ciliates, rotifers, acoels, nematodes and foraminiferans. Also, sympagic amphipods were found on the bottom of meltponds. We suggest that, in consequence of global warming, brackish and saline meltponds are becoming more frequent in the Arctic, providing a new habitat to marine metazoans.
机译：以前有报道说，由于淡水条件，北极海冰上的熔体没有海洋后生动物。 2007年夏季在北极中部观察到的主要为深色且经常为绿色和棕褐色的融化池塘，暗示了咸淡的条件和大量的藻类，可能使该生境适合于海洋后生动物。利用海冰和冰下研究的改良技术，研究了新的覆盖池塘表面的冰以及池塘底部腐烂的冰中融化以及共生动物的环境条件。由于腐烂的冰具有非常多孔的结构，因此熔池通常微咸至盐水，提供的生活条件与潜冰水非常相似。表面上的新冰盖具有与水平冰底层相似的特性。因此，后生动物可进入池塘并居住。新的冰盖和腐烂的冰被各种有症状的meiofauna类群居住，主要有纤毛，轮虫，有鳍，线虫和有孔虫。另外，在熔池的底部发现了共生的两足纲动物。我们建议，由于全球变暖的缘故，咸淡水和咸水融化在北极变得越来越频繁，为海洋后生动物提供了新的栖息地。

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