Cellular and Molecular Department, The Marine Biological Association of the UK, Plymouth, PL1 2PB, UK.
British Antarctic Survey, Cambridge, CB3 0ET, UK.
Sci Rep. 2020 Nov 6;10(1):19262. doi: 10.1038/s41598-020-76293-x.
Increasing influence of Atlantic water in the Arctic Ocean has the potential to significantly impact regional water temperature and salinity. Here we use a rDNA barcoding approach to reveal how microbial communities are partitioned into distinct assemblages across a gradient of Atlantic-Polar Water influence in the Norwegian Sea. Data suggest that temperate adapted bacteria may replace cold water taxa under a future scenario of increasing Atlantic influence, but the eukaryote response is more complex. Some abundant eukaryotic cold water taxa could persist, while less abundant eukaryotic taxa may be replaced by warmer adapted temperate species. Furthermore, within lineages, different taxa display evidence of increased relative abundance in reaction to favourable conditions and we observed that rare microbial taxa are sample site rather than region specific. Our findings have significant implications for the vulnerability of polar associated community assemblages, which may change, impacting the ecosystem services they provide, under predicted increases of Atlantic mixing and warming within the Arctic region.
北大西洋海水在北冰洋的影响不断增加，有可能显著影响区域水温盐度。在这里，我们使用 rDNA 条形码方法来揭示在挪威海的北大西洋-极地海水影响梯度上，微生物群落如何分为不同的组合。数据表明，在未来北大西洋影响增加的情况下，适应温带的细菌可能会取代冷水生物类群，但真核生物的反应更为复杂。一些丰富的真核冷水生物类群可能会继续存在，而一些较少的真核生物类群可能会被适应温暖水域的温带物种所取代。此外，在谱系内，不同的分类单元显示出对有利条件的相对丰度增加的证据，我们观察到稀有微生物分类单元是特定于样本地点而不是特定于区域的。我们的研究结果对极地相关群落组合的脆弱性具有重要意义，随着北极地区预测的大西洋混合和变暖的增加，这些组合可能会发生变化，从而影响它们提供的生态系统服务。
