摘要
Marine bacterioplankton communities have profound impact on global biogeochemical cycles and ecological balances.Surveys have been widely performed in seawater of different latitudes,yet relatively little is known about the diversity of bacterioplankton assemblages and the factors shaping their spatial distribution in subtropical island.Here,we investigated the bacterial communities in such a subtropical region,Xiamen Island,using quantitative PCR(qPCR) and 454 pyrosequencing methods.The qPCR results showed that there were higher 16 S rRNA gene abundance in nitrogen and phosphorus-rich sites.Pyrosequencing evidenced that a total of 267 genera of 47 classes in 26 different phyla(or candidate phyla) and some unclassified bacteria were obtained from 52034 high-quality reads.The most dominant phylum was Proteobacteria,followed by Bacteroidetes,Actinobacteria,Firmicutes,Verrucomicrobia and Planctomycetes.Alpha- and Gammaproteobacteria were the most predominant classes,and the most abundant OTU was affiliated with SAR11 clade,followed by Rhodobacteraceae and Oceanospirillaceae.Redundancy analysis(RDA) revealed that total nitrogen and phosphorus were the critical controlling factors to influence the bacterioplankton communities in Xiamen Island.These results will provide insights into bacterial abundance,diversity and distribution patterns,as well as their controlling factors,in subtropical marine ecosystems.
Marine bacterioplankton communities have profound impact on global biogeochemical cycles and ecological balances.Surveys have been widely performed in seawater of different latitudes,yet relatively little is known about the diversity of bacterioplankton assemblages and the factors shaping their spatial distribution in subtropical island.Here,we investigated the bacterial communities in such a subtropical region,Xiamen Island,using quantitative PCR(qPCR) and 454 pyrosequencing methods.The qPCR results showed that there were higher 16 S rRNA gene abundance in nitrogen and phosphorus-rich sites.Pyrosequencing evidenced that a total of 267 genera of 47 classes in 26 different phyla(or candidate phyla) and some unclassified bacteria were obtained from 52034 high-quality reads.The most dominant phylum was Proteobacteria,followed by Bacteroidetes,Actinobacteria,Firmicutes,Verrucomicrobia and Planctomycetes.Alpha- and Gammaproteobacteria were the most predominant classes,and the most abundant OTU was affiliated with SAR11 clade,followed by Rhodobacteraceae and Oceanospirillaceae.Redundancy analysis(RDA) revealed that total nitrogen and phosphorus were the critical controlling factors to influence the bacterioplankton communities in Xiamen Island.These results will provide insights into bacterial abundance,diversity and distribution patterns,as well as their controlling factors,in subtropical marine ecosystems.
引文