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LIU Hongmei, WANG Bin, HU Xiaoke. Sediment bacterial communities are more complex in coastal shallow straits than in oceanic deep straits[J]. HaiyangYuHuZhao, 2018, 36(5): 1643-1654

Sediment bacterial communities are more complex in coastal shallow straits than in oceanic deep straits

LIU Hongmei1, WANG Bin2, HU Xiaoke2
1 School of Ocean, Yantai University, Yantai 264003, China;
2 Key Laboratory of Coastal Biology and Bioresource Utilization, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
Straits are ideal models to investigate the bacterial community assembly in complex hydrological environments. However, few studies have focused on bacterial communities in them. Here, comparable bacterial communities in costal shallow Bohai Strait (BS) and oceanic deep Fram Strait (FS) were studied. The Shannon and Chao1 indices were both higher in BS than in FS. The relative abundances of the classes Deltaproteobacteria and Bacilli and the family Halieaceae were higher in BS than in FS, in contrast to the families OM1_clade and JTB255_marine_benthic_group, revealing typical characteristics of bacterial communities in coastal and oceanic regions. Cluster analysis based on the Bray-Curtis index showed that samples were clustered by depth layer in FS and BS, indicating that structures of bacterial communities would differ with increasing water depth in straits. Additionally, the cluster relationships among samples in abundant and rare communities were both similar to those in entire communities. However, the dissimilarities among samples showed a descending order as rare communities, entire communities and abundant communities. Network analysis indicated that the BS network was obviously more complex than the FS network. Filamentous bacteria Desulfobulbaceae exhibited high degree values in BS but not in FS, indicating key roles of Desulfobulbaceae in the BS. Our study provides different and common evidences for understanding microbial ecology in coastal shallow and oceanic deep straits.
Key words:    bacterial communities|Bohai Strait|Fram Strait|currents|microbial ecological network   
Received: 2017-05-04   Revised:
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