Seasonal Dynamics of Marine Microbial Community in the South Sea of Korea

Abstract

High-resolution 16S rRNA tag pyrosequencing was used to obtain seasonal snapshots of the bacterial diversity and community structure at two locations in Gosung Bay (South Sea, Korea) over a one year period. Seasonal sampling from the water column at each site revealed highly diverse bacterial communities containing up to 900 estimated Operational Taxonomic Units (OTUs). The Alphaproteobacteria and Gammaproteobacteria were the most abundant groups, and the most frequently recorded OTUs were members of Pelagibacter and Glaciecola. In particular, it was observed that Arcobacter, a genus of the Epsilonproteobacteria, dominated during summer. In addition, Psedoalteromonadaceae, Vibrionaceae and SAR11-1 were predominant members of the OTUs found in all sampling seasons. Environmental factors significantly influenced the bacterial community structure among season, with the phosphate and nitrate concentrations contributing strongly to the spatial distribution of the Alphaproteobacteria; the Gammaproteobacteria, Flavobacteria, and Actinobacteria all showed marked negative correlations with all measured nutrients, particularly silicon dioxide and chlorophyll-a. The results suggest that seasonal changes in environmental variables contribute to the dynamic structure of the bacterial community in the study area.

Microbiota Composition and Pulmonary Surfactant Protein Expression as Markers of Death by Drowning

“…The bacterial composition of the drowning medium samples was analyzed, and Proteobacteria generally predominated in both freshwater and seawater. These results are in agreement with previous reports of the microbial community of seawater and freshwater . Representative freshwater bacteria, such as the families Flavobacteriaceae and Planktophilia_f, were detected in the Han River sample.…”

Arcobacter

“…Pyrosequencing of 16S rDNA from seawater DNA extracts in Korea revealed the presence of large amounts of Arcobacter, but this was observed in the summer season only (Suh et al, 2015). Using a qPCR approach, abundance of Arcobacter in Lake Erie beach water was negatively correlated with water temperature in agreement with previous research reporting that they survive better at lower water temperatures (Lee et al, 2012;Salas-Massó et al, 2016).…”

Niche for high abundant extremophilic microbial communities in an ancient crater

“…Another pattern of diversity was constructed among phyla to measure the consistency among the six soil samples. The defined archaeal phylum was identified as Euryarchaeota, which probably reflected the marked functional diversity (Suh et al 2015) of halophiles. Three other observed phyla, Firmicutes, Proteobacteria and Bacteroidetes, showed the same pattern and consistency throughout sequencing data, with Firmicutes showing slightly more abundance (*4%) (composed mostly of Bacillus as soil consortium) than the other two.…”