Open AccessBacterial diversity of water and sediment in the Changjiang estuary and coastal area of the East China Sea
Author(s) -
Feng BiWei,
Li XiaoRan,
Wang JinHui,
Hu ZiYe,
Meng Han,
Xiang LingYun,
Quan ZheXue
Publication year - 2009
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.2009.00772.x
Subject(s) - estuary , gammaproteobacteria , biology , bacteroidetes , firmicutes , sediment , alphaproteobacteria , actinobacteria , diversity index , bacterioplankton , oceanography , proteobacteria , ecology , 16s ribosomal rna , species richness , phytoplankton , geology , bacteria , paleontology , genetics , nutrient
The Changjiang estuary and the coastal area of the East China Sea (ECS) represent important interfaces of terrestrial and marine environments. This study included analyses of water and sediments collected during different seasons in these regions to determine the composition of microbial assemblages by means of 16S rRNA gene clone libraries. We retrieved 1946 sequences and 779 distinct operational taxonomic units from 36 clone libraries. Shannon–Weaver diversity index values and rarefaction analysis indicated that bacterial diversity in the sediment samples was much higher than in the water samples. Proteobacteria (72.9%) was the most abundant phylum, followed by Firmicutes (6.4%), Bacteroidetes (4.6%) and Actinobacteria (4.1%). In the water, clone sequences related to Alphaproteobacteria were the most abundant, whereas in the sediment samples, sequences affiliated with Gammaproteobacteria were predominant. Principal coordinate analysis showed that water samples collected from the Changjiang estuary and the ECS clustered separately. However, this spatial pattern could not be observed in sediment samples, which were mainly distinguished from one another by the season. Bacterial diversity in the Changjiang estuary was higher than that in the ECS, which may be the result of the mixing of bacterial communities from the Changjiang River, the estuary and the coastal ocean.