期刊
FEMS MICROBIOLOGY ECOLOGY
卷 90, 期 2, 页码 424-435出版社
OXFORD UNIV PRESS
DOI: 10.1111/1574-6941.12404
关键词
16S rRNA gene; 454 pyrosequencing; habitat preference; hypoxia; Marine Group I; Pearl Estuary
类别
资金
- National Natural Science Foundation of China [41276141, 41221004, 41130857]
The significance of archaea in regulating biogeochemical processes has led to an interest in their community compositions. Using 454 pyrosequencing, the present study examined the archaeal communities along a subtropical estuary, Pearl Estuary, China. Marine Group I Thaumarchaeota (MG-I) were predominant in freshwater sites and one novel subgroup of MG-I, that is MG-I, was proposed. In addition, the previously defined MG-I II was grouped into two clusters (MG-I II-1, II-2). MG-I II-1 and MG-I II were both freshwater-specific, with MG-I II-1 being prevalent in the oxic water and MG-I II in the hypoxic water. Salinity, dissolved oxygen, nutrients and pH were the most important determinants that shaped the differential distribution of MG-I subgroups along Pearl Estuary. Marine Group II Euryarchaeota (MG-II) dominated the saltwater sites, but their abundance was higher in surface waters. The phylogenetic patterns of MG-I subgroups and their habitat preferences provide insight into their phylogeographic relationships. These results highlight the diversification of various ecotypes of archaea, especially of MG-I, under distinct environmental factors in Pearl Estuary, which are of great value for further exploring their ecological functions.
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