Thiele Stefan, Vader Anna, Thomson Stuart, Saubrekka Karoline, Petelenz Elzbieta, Müller Oliver, Bratbak Gunnar, Øvreås Lise
Department of Biological Science, University of Bergen, Bergen, Norway.
Bjerknes Centre for Climate Research, Bergen, Norway.
Front Microbiol. 2023 Jul 7;14:1213718. doi: 10.3389/fmicb.2023.1213718. eCollection 2023.
The Barents Sea is a transition zone between the Atlantic and the Arctic Ocean. The ecosystem in this region is highly variable, and a seasonal baseline of biological factors is needed to monitor the effects of global warming. In this study, we report the results from the investigations of the bacterial and archaeal community in late winter, spring, summer, and early winter along a transect through the northern Barents Sea into the Arctic Ocean east of Svalbard using 16S rRNA metabarcoding. Winter samples were dominated by members of the SAR11 clade and a community of nitrifiers, namely . Nitrosopumilus and LS-NOB (), suggest a prevalence of chemoautotrophic metabolisms. During spring and summer, members of the (mainly members of the SAR92 and OM60(NOR5) clades, ) and (mainly , and members of the NS9 marine group), which followed a succession based on their utilization of different phytoplankton-derived carbon sources, prevailed. Our results indicate that Arctic marine bacterial and archaeal communities switch from carbon cycling in spring and summer to nitrogen cycling in winter and provide a seasonal baseline to study the changes in these processes in response to the effects of climate change.
巴伦支海是大西洋和北冰洋之间的过渡区域。该区域的生态系统高度多变，需要生物因子的季节性基线来监测全球变暖的影响。在本研究中，我们报告了利用16S rRNA宏条形码技术，对从巴伦支海北部到斯瓦尔巴群岛以东北冰洋的一条断面沿线，在冬末、春季、夏季和初冬进行的细菌和古菌群落调查结果。冬季样本以SAR11进化枝成员和硝化细菌群落为主，即亚硝化侏儒菌属和LS-NOB（），表明化学自养代谢普遍存在。在春季和夏季，（主要是SAR92和OM60（NOR5）进化枝成员，）和（主要是、和NS9海洋类群成员）的成员占主导，它们根据对不同浮游植物衍生碳源的利用情况依次出现。我们的结果表明，北极海洋细菌和古菌群落从春季和夏季的碳循环转变为冬季的氮循环，并提供了一个季节性基线，以研究这些过程因气候变化影响而发生的变化。
