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首页> 外文期刊>Estuarine Coastal and Shelf Science >Bacterioplankton abundance and community structure during post-monsoon in mangrove dominated estuaries of the Indian Sundarbans; An insight to biogeochemical processes
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Bacterioplankton abundance and community structure during post-monsoon in mangrove dominated estuaries of the Indian Sundarbans; An insight to biogeochemical processes

机译：在印度阳光的红树林主导河道的季风蒙隆后的菌株和社区结构;对生物地球化学过程的见解

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摘要

Bacterioplankton abundances in three major estuaries of the Indian Sundarbans (Saptamukhi, Thakuran and Matla) were determined by flow cytometry and fluorescence microscopy in a post-monsoonal study followed by microbial community composition (16S rRNA clone library), during the period 2012-2016. All three estuaries were oxygenated and meso - to polyhaline. They had similar levels of dissolved inorganic carbon and nutrients and were net heterotrophic, as evidenced by net negative community productivity. Mean post-monsoon bacterioplankton abundances (x 10(9) cells L-1) in these estuaries were: Saptamukhi (1.30 +/- 0.78 x 10(9) cells L-1); Matla (1.38 +/- 1.34 x 10(9) cells L-1); Thakuran, (0.92 +/- 0.46 x 10(9) cells L-1). Bacterioplankton abundance was associated with water temperature coupled with dissolved inorganic nutrients and carbonate parameters. Highest abundances were at the most upstream sites in the Saptamukhi and Matla estuaries, while a mid-estuarine peak was evident in Thakuran. In the Saptamukhi and Thakuran the bacterioplankton was dominated by Proteobacteria (mostly Deltaproteobacteria), with a contribution from Bacteroidetes in the Saptamukhi and from Cyanobacteria and Actinobacteria in the Thakuran. Despite the oxygenated nature of these estuaries, clones resembling the sulfate reducer Desulfovibrio sp. were detected, and this could be a consequence of anoxic pore water exchange across the sediment-water interface. Sulfate reduction may thus be an important pathway for carbon metabolism in these ecosystems.
机译：在印度Sundarbans（SAPTAMUKHI，THAKURAN和MATLA）的三个主要河口中的Bacterioplankton丰富通过流式细胞术和荧光显微镜在季后赛后的荧光显微镜中测定，然后在2012-2016期间进行微生物群落组合物（16S rRNA克隆文库）。所有三个河口都是含氧量的和中间卤化物。它们具有相似的溶解无机碳和营养水平，并且是净异养，如净负面群落生产率所证明。在这些河口中的平均季风菌株（X 10（9）细胞L-1）是：SAPTAMUKHI（1.30 +/- 0.78×10（9）细胞L-1）; MATLA（1.38 +/- 1.34 x 10（9）细胞L-1）; Thakuran，（0.92 +/- 0.46 x 10（9）个细胞L-1）。菌株与溶解无机营养和碳酸盐参数偶联的水温有关。最高的丰富是SAPTAMUKHI和MATLA河口的最上游地点，而在THAKURAN中，中河鱼峰是明显的。在SAPTAMUKHI和Thakuran，菌株被蛋白酶体（大多数deltaproteobacteria）占主导地位，育苜蓿中的Bacternetes和来自Thakuran中的菌菌和肌动菌的菌株的贡献。尽管这些河口的含氧性质，但类似于硫酸硫酸盐还原剂的克隆。被检测到，这可能是沉积物 - 水界面穿过缺氧孔隙水交换的结果。因此，硫酸盐降低可能是这些生态系统中碳代谢的重要途径。

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