Sea ice presence is linked to higher carbon export and vertical microbial connectivity in the Eurasian Arctic Ocean.

Autor: Fadeev E; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany. eduard.fadeev@univie.ac.at.; Max Planck Institute for Marine Microbiology, D-28359, Bremen, Germany. eduard.fadeev@univie.ac.at.; Department of Functional and Evolutionary Ecology, University of Vienna, A-1090, Vienna, Austria. eduard.fadeev@univie.ac.at., Rogge A; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany.; Institute for Ecosystem Research, Kiel University, D-24118, Kiel, Germany., Ramondenc S; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany., Nöthig EM; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany., Wekerle C; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany., Bienhold C; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany.; Max Planck Institute for Marine Microbiology, D-28359, Bremen, Germany., Salter I; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany.; Faroe Marine Research Institute, FO 100, Tórshavn, Faroe Islands., Waite AM; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany.; Ocean Frontier Institute, NS, B3H 4R2, Halifax, Canada., Hehemann L; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany., Boetius A; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany.; Max Planck Institute for Marine Microbiology, D-28359, Bremen, Germany.; MARUM and University of Bremen, D-28359, Bremen, Germany., Iversen MH; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, D-27570, Bremerhaven, Germany. morten.iversen@awi.de.; MARUM and University of Bremen, D-28359, Bremen, Germany. morten.iversen@awi.de.
Jazyk: angličtina
Zdroj: Communications biology [Commun Biol] 2021 Nov 03; Vol. 4 (1), pp. 1255. Date of Electronic Publication: 2021 Nov 03.
DOI: 10.1038/s42003-021-02776-w
Abstrakt: Arctic Ocean sea ice cover is shrinking due to warming. Long-term sediment trap data shows higher export efficiency of particulate organic carbon in regions with seasonal sea ice compared to regions without sea ice. To investigate this sea-ice enhanced export, we compared how different early summer phytoplankton communities in seasonally ice-free and ice-covered regions of the Fram Strait affect carbon export and vertical dispersal of microbes. In situ collected aggregates revealed two-fold higher carbon export of diatom-rich aggregates in ice-covered regions, compared to Phaeocystis aggregates in the ice-free region. Using microbial source tracking, we found that ice-covered regions were also associated with more surface-born microbial clades exported to the deep sea. Taken together, our results showed that ice-covered regions are responsible for high export efficiency and provide strong vertical microbial connectivity. Therefore, continuous sea-ice loss may decrease the vertical export efficiency, and thus the pelagic-benthic coupling, with potential repercussions for Arctic deep-sea ecosystems.
(© 2021. The Author(s).)
Databáze: MEDLINE
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