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BACTERIAL DIVERSITY AND COMMUNITY STRUCTURE IN SURFACE SEAWATER OF CHANGJIANG RIVER ESTUARY AND ADJACENT AREAS
Author(s): 
Pages: 1531-1541
Year: Issue:  6
Journal: Oceanologia et Limnologia Sinica

Keyword:  Changjiang River estuarybacteriadiversityDAPI16S r DNA;
Abstract: We sampled surface seawater in 10 stations in Changjiang River estuary and adjacent areas, and studied the diversity and community structure of bacteria in seawater, showing high abundance of bacteria in the study region ranging between 1.16×105(Station A04) and 1.48×106 cells/m L(B03) by DAPI direct count. Among them, 60.61% the total clone library was Proteobacteria, of which Alphaproteobacteria took 50.62%, Bacteroidetes(15.18%), Actinobacteria(14.79%), Cyanobacteria(4.61%), few Firmicutes, Chloroflexi, Acidobacteria, Planctomycetes, Fibrobacteres, and Verrucomicrobia, and occasionally Tenericutes and SAR groups as shown in phylogenetic analysis on the clone libraries. Therefore, the bacteria in the surface water of Changjiang River estuary and adjacent areas was abundant and diversified in complicated structures, reflecting the impacts of local aquaculture activities and regional marine physical-chemical settings, for example, the oxygen depletion at sea bottom and Changjiang River water dilution.
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