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首页> 外文期刊>Estuarine Coastal and Shelf Science >Community structure and distribution of benthic Bacteria and Archaea in a stratified coastal lagoon in the Southern Gulf of Mexico
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Community structure and distribution of benthic Bacteria and Archaea in a stratified coastal lagoon in the Southern Gulf of Mexico

机译：墨西哥南部海湾分层沿海泻湖底栖细菌和古生菌的群落结构和分布

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摘要

Coastal lagoons are important aquatic systems with strong physicochemical gradients, where the participation of microorganisms in biogeochemical cycles has been well recognised; however, to date, the microbial diversity and distribution in these environments remains under-investigated. Here, three distinguished regions (oligohaline, marine and the mixing) of a transitional coastal lagoon were explored to characterise the structure and composition of benthic microbial communities through 16S rRNA gene Illumina-sequencing, for both Bacteria and Archaea domains. Principal coordinate analysis showed differences in the community structure according to the analysed zones. PERMANOVA analysis evidenced that, of the measured variables, sample zonation and salinity were the main environmental factors explaining the variance of the prokaryotic assemblages. Differentially abundant microbial taxa were detected for each region of the lagoon by LEfSe analysis. Representative members of anaerobic methanogens/methanotrophs (Methanosaetaceae, ANME 1-b and WSA2) were enriched in the oligohaline sediments, while the coastal marine zone had a community represented mainly by Sandaracinaceae, Aminicenantes and Thaumarchaeota (Group-C3). The sediments in the mixing zone had higher abundance of Flavobacteriaceae, Syntrophobacteraceae and uncultured Thermoplasmatales, Bathyarchaeota and Lokiarchaeota. This study expands the available information of the composition and distribution of uncultured Bacteria and Archaea in transitional coastal lagoons, contributing to a systematic understanding of the functioning of these ecosystems.
机译：沿海泻湖是重要的水生系统，具有很强的理化梯度，人们已经充分认识到微生物参与了生物地球化学循环。然而，迄今为止，在这些环境中的微生物多样性和分布仍未得到充分研究。在这里，探索了一个沿海过渡泻湖的三个显着区域（低盐，海洋和混合），通过细菌和古细菌域的16S rRNA基因Illumina测序来表征底栖微生物群落的结构和组成。主坐标分析表明，根据所分析的区域，群落结构存在差异。 PERMANOVA分析表明，在测量变量中，样品分区和盐度是解释原核生物多样性的主要环境因素。通过LEfSe分析在泻湖的每个区域检测到差异丰富的微生物分类群。厌氧产甲烷菌/甲烷营养生物的代表成员（甲烷藻科，ANME 1-b和WSA2）富含寡盐沉积物，而沿海海洋区的群落主要由金刚藻科，虾科和梭菌（C3组）代表。混合区的沉积物具有较高的黄杆菌科细菌，风化细菌科和未培养的热线虫，Bathyarchaeota和Lokiarchaeota。这项研究扩大了过渡沿海泻湖中未培养细菌和古细菌的组成和分布的可用信息，有助于系统地了解这些生态系统的功能。

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