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Spatiotemporal dynamics of marine bacterial and archaeal communities in surface waters off the northern Antarctic Peninsula
Univ Sao Paulo, Brazil.
Univ Sao Paulo, Brazil.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Univ Fed Rio De Janeiro UFRJ, Brazil.
WHOI, MA 02543 USA.
2018 (English)In: Deep-sea research. Part II, Topical studies in oceanography, ISSN 0967-0645, E-ISSN 1879-0100, Vol. 149, p. 150-160Article in journal (Refereed) Published
Abstract [en]

Seasonal changes in taxonomic and functional diversity of microbial communities in polar regions are commonly observed, requiring strategies of microbes to adapt to the corresponding changes in environmental conditions. These natural fluctuations form the backdrop for changes induced by anthropogenic impacts. The main goal of this study was to assess the seasonal and temporal changes in bacterial and archaeal diversity and community structure off the northern Antarctic Peninsula over several seasons (spring, summer, autumn) from 2013 to 2015. Ten monitoring stations were selected across the Gerlache and Bransfield Straits and nearby Elephant Island, and archaeal and bacterial communities examined by amplicon sequencing of 16S rRNA genes. Alpha-diversity indices were higher in spring and correlated significantly with temperature. Spring was characterized by the presence of SAR11, and microbial communities remaining from winter, including representatives of Thaumarchaeota (Nimosopurnilus), Euryarchaeota, members of Oceanospirillales, SAR324. Summer and autumn were characterized by a high prevalence of Flavobacteria (NS5 marine group and Polaribacter), Alphaproizobacteria (Rhodobacterales and SAR11 Glade) and Gammaproteobacteria (Oceanospirillales/Balneatrix and Celivibrionales), generally known to be associated with organic matter degradation. Relatively higher abundance of phytoplankton groups occurred in spring, mainly characterized by the presence of the haptophyte Phaeocystis and the diatom Corethron, influencing the succession of heterotrophic bacterial communities. Microbial diversity and community structure varied significantly over time, but not over space, i.e., were similar between monitoring stations for the same time. In addition, the observed interannual variability in microbial community structure might be related to an increase in sea surface temperature. Environmental conditions related to seasonal variation, including temperature and most likely phytoplankton derived organic matter, appear to have triggered the observed shifts in microbial communities in the waters off the northern Antarctic Peninsula.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 149, p. 150-160
Keywords [en]
Microbial Oceanography; Phytoplankton; Interannual variability; Seasonal changes; Spatial changes; Temperature; Organic matter
National Category
Ecology
Identifiers
URN: urn:nbn:se:liu:diva-149885DOI: 10.1016/j.dsr2.2017.12.017ISI: 000437037100014OAI: oai:DiVA.org:liu-149885DiVA, id: diva2:1236406
Note

Funding Agencies|Project INTERBIOTA (CNPq) [407889/2013-2]; INCT-MAR-COI (CNPq); CNPq; FAPERJ; Investment in Science Funds at WHOI; Scientific Committee on Antarctic Research (SCAR) Fellowship; Sao Paulo Research Foundation [FAPESP 2016/16183-5]

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-22

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Available from 2019-12-20 00:01

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Enrich Prast, Alex

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