A Unique Benthic Microbial Community Underlying the Phaeocystis antarctica-Dominated Amundsen Sea Polynya, Antarctica: A Proxy for Assessing the Impact of Global Changes SCIE SCOPUS

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Title
A Unique Benthic Microbial Community Underlying the Phaeocystis antarctica-Dominated Amundsen Sea Polynya, Antarctica: A Proxy for Assessing the Impact of Global Changes
Author(s)
Cho, Hyeyoun; Hwang, Chung Yeon; Kim, Jong-Geol; Kang, Sanghoon; Knittel, Katrin; Choi, Ayeon; Kim, Sung-Han; Rhee, Sung-Keun; Yang, Eun Jin; Lee, SangHoon; Hyun, Jung-Ho
KIOST Author(s)
Kim, Sung Han(김성한)
Publication Year
2020-01-10
Abstract
Polynyas in the polar seas are regarded as windows through which ecosystem responses associated with global climate changes are to be noticed. However, little information is available on benthic microbial communities in the Amundsen Sea polynya (ASP), where environmental changes due to global warming are occurring rapidly, from which future climate change-induced ecosystem responses could be assessed. We performed high-throughput sequencing of 16S rRNA genes and quantitative PCR in combination with biogeochemical analyses and metabolic rate measurements to determine the composition, diversity and controls of major microbial communities in sediments of the ASP. A large fraction of the sequenced benthic microbial community (40% on average) in the polynya was uniquely affiliated with the phylum Planctomycetes, whereas Thaumarchaeota (51% on average) predominated in non-polynya areas. The relative abundance of Planctomycetes correlated significantly with organic carbon (C org ) content in the polynya sediment underlying the Phaeocystis-dominated water column. These results suggest that Planctomycetes comprise a major bacterial group utilizing relatively recalcitrant C org produced primarily by Phaeocystis blooms. In contrast, the predominance of chemolithoautotrohic Thaumarchaeota in the sea-ice zone was attributed to low C o r g supply due to low primary productivity in the ice-covered water column. The Planctomycetes-dominated microbial communities in the ASP is in stark contrast to that Proteobacteria (Delta- and Gamma-proteobacteria) occupy ecological niches as primary mineralizers of organic materials in most benthic systems in the Southern Ocean, where organic materials in the sediments mostly originate from diatom blooms. Given that microbial communities respond quickly to environmental changes, and that global climate change is proceeding rapidly in the ASP, our results suggest that any modifications in the Flanctomycetas-dominated microbial communities will provide valuable insight into changes in organic matter transport to the seafloor that may result from shifts in planktonic communities from Phaeocystis to diatoms associated with climate change.
ISSN
2296-7745
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/415
DOI
10.3389/fmars.2019.00797
Bibliographic Citation
FRONTIERS IN MARINE SCIENCE, v.6, 2020
Publisher
FRONTIERS MEDIA SA
Subject
RIBOSOMAL-RNA SEQUENCES; PINE ISLAND GLACIER; BACTERIAL COMMUNITIES; MARINE-SEDIMENTS; ROSS SEA; SP-NOV.; RHODOPIRELLULA-BALTICA; PHYTOPLANKTON BLOOM; AMMONIA OXIDATION; CONTINENTAL-SHELF
Keywords
Amundsen Sea polynya; Antarctica; benthic microbial community; global climate change; organic carbon mineralization; Phaesocystis antarctica; Planctomycetes; Thaumarchaeota
Type
Article
Language
English
Document Type
Article
Publisher
FRONTIERS MEDIA SA
Related Researcher
Research Interests

Marine chemistry,Benthic biogeochemistry,Microbial ecology,해양화학,퇴적물 생지화학,미생물 생태학

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