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首页> 外文期刊>Environmental microbiology >Diversity and community structure within anoxic sediment from marine salinity meromictic lakes and a coastal meromictic marine basin , Vestfold Hills, Eastern Antarctica
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Diversity and community structure within anoxic sediment from marine salinity meromictic lakes and a coastal meromictic marine basin , Vestfold Hills, Eastern Antarctica

机译：南极东部Vestfold Hills海洋盐度淡紫色湖泊和沿海淡紫色海洋盆地缺氧沉积物中的多样性和群落结构

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摘要

16S rDNA clone library analysis was used to examine the biodiversity and community structure within anoxic sediments of several marine-type salinity meromictic lakes and a coastal marine basin located in the Vestfolds Hills area of Eastern Antarctica. From 69 to 130 (555 total) 16S rDNA clones were analysed from each sediment sample, and restriction fragment length polymorphism (RFLP) and sequence analysis grouped the clones into 202 distinct phylotypes (a clone group with sequence similarity of > 0.98). A number of phylotypes and phylotype groups predominated in all libraries, with a group of 10 phylotypes (31% of clones) forming a novel deep branch within the low G + C Gram-positive division. Other abundant phylotypes detected in several different clone libraries grouped with Prochlorococcus cyanobacteria, diatom chloroplasts, delta proteobacteria (Desulfosarcina group, Syntrophus and Geobacterl Pelobacterl Desulphuromonas group), order Chlamydiales (Parachlamydiaceae) and Spirochaetales (wall-less Antarctic spirochaetes). Most archaeal clones detected (3.1% of clones) belonged to highly diverged group of Euryarchaeota clustering with clones previously detected in rice soil, aquifer sediments and hydrothermal vent material. Little similarity existed between the phylotypes detected in this study and other clone libraries based on marine sediment, suggesting that an enormous prokaryotic diversity occurs within marine and marinederived sediments.
机译：16S rDNA克隆文库分析用于检查南极东部Vestfolds Hills地区几个海洋型盐度淡紫色湖泊和沿海海洋盆地缺氧沉积物中的生物多样性和群落结构。从每个沉积物样品中分析了69到130个（总共555个）16S rDNA克隆，限制性片段长度多态性（RFLP）和序列分析将这些克隆分为202个不同的系统型（序列相似度> 0.98的克隆组）。在所有文库中，许多系统型和系统型组均占优势，其中10种系统型（占克隆的31％）在低G + C革兰氏阳性区中形成新的深分支。在几个不同的克隆文库中检测到其他丰富的系统型，这些克隆文库与原球藻蓝藻细菌，硅藻叶绿体，三角洲变形杆菌（脱硫藻球菌属，拟南芥属和土杆菌去皮肺炎菌群），衣原体（肺炎衣原体）和螺旋体（无壁）在一起。检测到的大多数古细菌克隆（占克隆的3.1％）属于Euryarchaeota簇的高度分散类群，先前在水稻土壤，含水层沉积物和热液喷口材料中发现了这些克隆。在这项研究中检测到的系统型与其他基于海洋沉积物的克隆文库之间几乎没有相似性，这表明海洋和海洋衍生的沉积物中存在着巨大的原核生物多样性。

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