An active bacterial community linked to high chl-a concentrations in Antarctic winter-pack ice and evidence for the development of an anaerobic sea-ice bacterial community
An active bacterial community linked to high chl-a concentrations in Antarctic winter-pack ice and evidence for the development of an anaerobic sea-ice bacterial community
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DOI：
10.1038/ismej.2017.96
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发表时间：
2017-10-01
期刊：
影响因子：
11
通讯作者：
Tison, Jean-Louis
中科院分区：
文献类型：
--
作者：
Eronen-Rasimus, Eeva;Luhtanen, Anne-Mari;Tison, Jean-Louis
2013年南极冬季对南极海冰细菌群落组成及不同发育阶段的动态进行了研究。厚厚的积雪很可能使冰层绝缘，导致叶绿素a浓度高（< 4 μ g l（-1）），从而产生细菌。典型的海冰细菌属，如Octadecabacter，Polaribacter和Glaciecola，在海冰藻华期间的春季和夏季经常丰富，在社区中占主导地位。在不同的冰类型的细菌群落组成的变化主要是由叶绿素a浓度解释，这表明在春季和夏季海冰，海冰细菌和藻类也可能耦合在南极冬季。细菌丰度和叶绿素a产量之间的显著相关性进一步支持了细菌群落和海冰藻类之间的耦合。此外，硫酸盐还原菌（例如，Desulforhopalus）与硫化氢的气味一起观察到厚，显然缺氧的冰，这表明厌氧细菌群落的发展可能会发生在海冰在适当的条件下。总之，研究结果表明，南极海冰中的细菌群落在整个冬季都可以保持活跃，因此未来可能的海冰变暖和随之而来的细菌产量增加可能会导致南极海冰区细菌介导的过程发生变化。
Antarctic sea-ice bacterial community composition and dynamics in various developmental stages were investigated during the austral winter in 2013. Thick snow cover likely insulated the ice, leading to high (< 4 mu g l(-1)) chlorophyll-a (chl-a) concentrations and consequent bacterial production. Typical sea-ice bacterial genera, for example, Octadecabacter, Polaribacter and Glaciecola, often abundant in spring and summer during the sea-ice algal bloom, predominated in the communities. The variability in bacterial community composition in the different ice types was mainly explained by the chl-a concentrations, suggesting that as in spring and summer sea ice, the sea-ice bacteria and algae may also be coupled during the Antarctic winter. Coupling between the bacterial community and sea-ice algae was further supported by significant correlations between bacterial abundance and production with chl-a. In addition, sulphate-reducing bacteria (for example, Desulforhopalus) together with odour of H2S were observed in thick, apparently anoxic ice, suggesting that the development of the anaerobic bacterial community may occur in sea ice under suitable conditions. In all, the results show that bacterial community in Antarctic sea ice can stay active throughout the winter period and thus possible future warming of sea ice and consequent increase in bacterial production may lead to changes in bacteria-mediated processes in the Antarctic sea-ice zone.