title: Diversity of bacterioplankton in the surface seawaters of Drake Passage near the Chinese Antarctic station.
abstract: The determination of relative abundances and distribution of different bacterial groups is a critical step toward understanding the functions of various bacteria and its surrounding environment. Few studies focus on the taxonomic composition and functional diversity of microbial communities in Drake Passage. In this study, marine bacterioplankton communities from surface seawaters at five locations in Drake Passage were examined by 16S rRNA gene sequence analyses. The results indicated that psychrophilic bacteria were the most abundant group in Drake Passage, and mainly made up of Bacillus, Aeromonas, Psychrobacter, Pseudomonas and Halomonas. Diversity analysis showed that surface seawater communities had no significant correlation with latitudinal gradient. Additionally, a clear difference among five surface seawater communities was evident, with 1.8% OTUs (only two) belonged to Bacillus consistent across five locations and 71% OTUs (80) existed in only one location. However, the few cosmopolitans had the largest population sizes. Our results support the hypothesis that the dominant bacterial groups appear to be analogous between geographical sites, but significant differences may be detected among rare bacterial groups. The microbial diversity of surface seawaters would be liable to be affected by environmental factors.
authors.affiliation: Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, PR China.
authors.forename: Mengxin
authors.initials: M
authors.lastname: Xing
authors.affiliation: Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, PR China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, PR China sunmi0532@yahoo.com.
authors.forename: Mi
authors.initials: M
authors.lastname: Sun
mesh_terms: D000333:Aeromonas / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D000864:Antarctic Regions; D001407:Bacillus / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D001419:Bacteria / Q000145:classification / Q000235:genetics*; D018407:Bacterial Physiological Phenomena; D044822:Biodiversity; D002681:China; D019295:Computational Biology; D059013:Microbial Consortia / Q000235:genetics / Q000502:physiology; D010802:Phylogeny; D010933:Plankton / Q000145:classification / Q000235:genetics* / Q000502:physiology*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D017421:Sequence Analysis; D017422:Sequence Analysis, DNA
chemical_list: D012336:RNA, Ribosomal, 16S
keywords: 16S rRNA; Antarctic; Drake Passage; bacterial diversity; surface seawater