Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Sorbonne Université, CNRS, UMR7144, Ecology of Marine Plankton team, Station Biologique de Roscoff, 29680, Roscoff, France.
Sci Rep. 2019 Nov 8;9(1):16390. doi: 10.1038/s41598-019-52648-x.
Singapore, an equatorial island in South East Asia, is influenced by a bi-annual reversal of wind directions which defines two monsoon seasons. We characterized the dynamics of the microbial communities of Singapore coastal waters by collecting monthly samples between February 2017 and July 2018 at four sites located across two straits with different trophic status, and sequencing the V6-V8 region of the small sub-unit ribosomal RNA gene (rRNA gene) of Bacteria, Archaea, and Eukaryota. Johor Strait, which is subjected to wider environmental fluctuations from anthropogenic activities, presented a higher abundance of copiotrophic microbes, including Cellvibrionales and Rhodobacterales. The mesotrophic Singapore Strait, where the seasonal variability is caused by changes in the oceanographic conditions, harboured a higher proportion of typically marine microbe groups such as Synechococcales, Nitrosupumilales, SAR11, SAR86, Marine Group II Archaea and Radiolaria. In addition, we observed seasonal variability of the microbial communities in the Singapore Strait, which was possibly influenced by the alternating monsoon regime, while no seasonal pattern was detected in the Johor Strait.
新加坡是东南亚的一个赤道岛国，受到季风风向每年两次反转的影响，形成了两个季风季节。我们通过在 2017 年 2 月至 2018 年 7 月期间在四个位于两个海峡的不同营养状态的地点每月收集样本，对新加坡沿海水域的微生物群落动态进行了描述，这些样本的采集使用了 V6-V8 区的细菌、古菌和真核生物小亚基核糖体 RNA 基因（rRNA 基因）进行测序。受人为活动影响，环境波动较大的柔佛海峡拥有更多的富营养微生物，包括 Cellvibrionales 和 Rhodobacterales。中营养的新加坡海峡，其季节性变化是由海洋学条件的变化引起的，拥有更高比例的典型海洋微生物群体，如蓝藻目、硝化螺旋菌目、SAR11、SAR86、海洋群 II 古菌和放射虫。此外，我们还观察到新加坡海峡的微生物群落具有季节性变化，这可能受到季风交替的影响，而在柔佛海峡则没有检测到季节性模式。
