Niche partitioning by photosynthetic plankton as a driver of CO 2 -fixation across the oligotrophic South Pacific Subtropical Ocean.

Autor: Duerschlag J; Max Planck Institute for Marine Microbiology, Bremen, Germany.; Department of Geophysical Sciences, University of Chicago, Chicago, IL, USA., Mohr W; Max Planck Institute for Marine Microbiology, Bremen, Germany., Ferdelman TG; Max Planck Institute for Marine Microbiology, Bremen, Germany. tferdelm@mpi-bremen.de., LaRoche J; Department of Biology, Dalhousie University, Halifax, NS, Canada., Desai D; Department of Biology, Dalhousie University, Halifax, NS, Canada., Croot PL; iCRAG (Irish Centre for Research in Applied Geoscience), Earth and Ocean Sciences, School of Natural Sciences and the Ryan Institute, National University of Ireland Galway, Galway, Ireland., Voß D; Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany., Zielinski O; Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany.; Marine Perception Research Group, German Research Center for Artificial Intelligence (DFKI), Oldenburg, Germany., Lavik G; Max Planck Institute for Marine Microbiology, Bremen, Germany., Littmann S; Max Planck Institute for Marine Microbiology, Bremen, Germany., Martínez-Pérez C; Max Planck Institute for Marine Microbiology, Bremen, Germany.; Institute for Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, Eidgenössische Technische Hochschule (ETH) Zürich, Zurich, Switzerland., Tschitschko B; Max Planck Institute for Marine Microbiology, Bremen, Germany., Bartlau N; Max Planck Institute for Marine Microbiology, Bremen, Germany., Osterholz H; Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany.; Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany., Dittmar T; Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany.; Helmholtz Institute for Functional Marine Biodiversity (HIFMB), University of Oldenburg, Oldenburg, Germany., Kuypers MMM; Max Planck Institute for Marine Microbiology, Bremen, Germany.
Jazyk: angličtina
Zdroj: The ISME journal [ISME J] 2022 Feb; Vol. 16 (2), pp. 465-476. Date of Electronic Publication: 2021 Aug 19.
DOI: 10.1038/s41396-021-01072-z
Abstrakt: Oligotrophic ocean gyre ecosystems may be expanding due to rising global temperatures [1-5]. Models predicting carbon flow through these changing ecosystems require accurate descriptions of phytoplankton communities and their metabolic activities [6]. We therefore measured distributions and activities of cyanobacteria and small photosynthetic eukaryotes throughout the euphotic zone on a zonal transect through the South Pacific Ocean, focusing on the ultraoligotrophic waters of the South Pacific Gyre (SPG). Bulk rates of CO 2 fixation were low (0.1 µmol C l -1  d -1 ) but pervasive throughout both the surface mixed-layer (upper 150 m), as well as the deep chlorophyll a maximum of the core SPG. Chloroplast 16S rRNA metabarcoding, and single-cell 13 CO 2 uptake experiments demonstrated niche differentiation among the small eukaryotes and picocyanobacteria. Prochlorococcus abundances, activity, and growth were more closely associated with the rims of the gyre. Small, fast-growing, photosynthetic eukaryotes, likely related to the Pelagophyceae, characterized the deep chlorophyll a maximum. In contrast, a slower growing population of photosynthetic eukaryotes, likely comprised of Dictyochophyceae and Chrysophyceae, dominated the mixed layer that contributed 65-88% of the areal CO 2 fixation within the core SPG. Small photosynthetic eukaryotes may thus play an underappreciated role in CO 2 fixation in the surface mixed-layer waters of ultraoligotrophic ecosystems.
(© 2021. The Author(s).)
Databáze: MEDLINE
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