title: Bacterial biogeography influenced by shelf-basin exchange in the Arctic surface sediment at the Chukchi Borderland.
abstract: It has been known that continental shelves around the Arctic Ocean play a major role in the ventilation of the deep basins as a consequence of shelf-basin exchange. In the present study, we found that bacterial assemblage of the surface sediment was different from that of seawater while seawater harboured local bacterial assemblages in response to the Arctic hydrography. This finding suggests that the Arctic seafloor sediments may have distinctive bacterial biogeography. Moreover, the distribution of bacterial assemblages and physicochemical properties in surface sediments changed gradually from the Arctic continental shelf to deep-sea basin. Based on the results, bacterial biogeography in the Arctic seafloor sediments may be influenced by winnowing and re-deposition of surface sediments through the sediment gravity flow. The present study offers a deeper understanding of shelf convection and its role for the construction of bacterial assemblages in the Arctic Ocean.
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
authors.forename: Dukki
authors.initials: D
authors.lastname: Han
authors.affiliation: Korea Polar Research Institute, Incheon, 21990, Republic of Korea.
authors.forename: Seung-Il
authors.initials: SI
authors.lastname: Nam
authors.affiliation: Department of Ocean Sciences, Inha University, Incheon, 22212, Republic of Korea.
authors.forename: Ho Kyung
authors.initials: HK
authors.lastname: Ha
authors.affiliation: Korea Polar Research Institute, Incheon, 21990, Republic of Korea.
authors.forename: Hyoungjun
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Soil, Water, and Climate, Biotechnology Institute, Microbial Plant and Genomics Institute, University of Minnesota, St. Paul, MN, 55108, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Sadowsky
authors.affiliation: Korea Polar Research Institute, Incheon, 21990, Republic of Korea.
authors.forename: Yoo Kyung
authors.initials: YK
authors.lastname: Lee
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
authors.forename: Hor-Gil
authors.initials: HG
authors.lastname: Hur
mesh_terms: D001110:Arctic Regions; D001419:Bacteria / Q000145:classification* / Q000378:metabolism; D044822:Biodiversity; D019015:Geologic Sediments / Q000382:microbiology*; D008969:Molecular Sequence Data; D009792:Oceans and Seas; D012623:Seawater / Q000382:microbiology*