Atlantic water influx and sea-ice cover drive taxonomic and functional shifts in Arctic marine bacterial communities

Priest, Taylor, von Appen, Wilken-Jon, Oldenburg, Ellen, Popa, Ovidiu, Torres-Valdés, Sinhué, Bienhold, Christina, Metfies, Katja, Boulton, William, Mock, Thomas ORCID:, Fuchs, Bernhard M., Amann, Rudolf, Boetius, Antje and Wietz, Matthias (2023) Atlantic water influx and sea-ice cover drive taxonomic and functional shifts in Arctic marine bacterial communities. ISME Journal, 17 (10). pp. 1612-1625. ISSN 1751-7362

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The Arctic Ocean is experiencing unprecedented changes because of climate warming, necessitating detailed analyses on the ecology and dynamics of biological communities to understand current and future ecosystem shifts. Here, we generated a four-year, high-resolution amplicon dataset along with one annual cycle of PacBio HiFi read metagenomes from the East Greenland Current (EGC), and combined this with datasets spanning different spatiotemporal scales (Tara Arctic and MOSAiC) to assess the impact of Atlantic water influx and sea-ice cover on bacterial communities in the Arctic Ocean. Densely ice-covered polar waters harboured a temporally stable, resident microbiome. Atlantic water influx and reduced sea-ice cover resulted in the dominance of seasonally fluctuating populations, resembling a process of “replacement” through advection, mixing and environmental sorting. We identified bacterial signature populations of distinct environmental regimes, including polar night and high-ice cover, and assessed their ecological roles. Dynamics of signature populations were consistent across the wider Arctic; e.g. those associated with dense ice cover and winter in the EGC were abundant in the central Arctic Ocean in winter. Population- and community-level analyses revealed metabolic distinctions between bacteria affiliated with Arctic and Atlantic conditions; the former with increased potential to use bacterial- and terrestrial-derived substrates or inorganic compounds. Our evidence on bacterial dynamics over spatiotemporal scales provides novel insights into Arctic ecology and indicates a progressing Biological Atlantification of the warming Arctic Ocean, with consequences for food webs and biogeochemical cycles.

Item Type: Article
Additional Information: Funding Information: We thank Jana Bäger, Theresa Hargesheimer, Rafael Stiens and Lili Hufnagel for RAS operation; Daniel Scholz for RAS and sensor operations and programming; Normen Lochthofen, Janine Ludszuweit, Lennard Frommhold and Jonas Hagemann for mooring operation; Jakob Barz, Swantje Ziemann and Anja Batzke for DNA extraction and library preparation, and Bruno Huettel, Christian Woehle and the technicians at the Max Planck Genome Centre in Cologne for metagenome sequencing. The captain, crew and scientists of RV Polarstern cruises PS99.2, PS107, PS114, PS121 and PS126 are gratefully acknowledged. We thank Oliver Ebenhöh and Eva-Maria Nöthig for helpful discussions. Ian Salter made essential contributions during the early phase of FRAM. Funding Information: Open Access funding enabled and organized by Projekt DEAL. This project has received funding from the European Research Council (ERC) under the European Union’s Seventh Framework Program (FP7/2007-2013) research project ABYSS (Grant Agreement no. 294757) to AB. Additional funding came from the Helmholtz Association, specifically for the FRAM infrastructure, and from the Max Planck Society. Publisher Copyright: © 2023, The Author(s).
Uncontrolled Keywords: microbiology,ecology, evolution, behavior and systematics,sdg 13 - climate action,sdg 14 - life below water,sdg 15 - life on land ,/dk/atira/pure/subjectarea/asjc/2400/2404
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Faculty of Science > Research Groups > Environmental Biology
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Depositing User: LivePure Connector
Date Deposited: 11 Mar 2024 10:31
Last Modified: 11 Mar 2024 10:31
DOI: 10.1038/s41396-023-01461-6

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