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Planktonic Aggregates as Hotspots for Heterotrophic Diazotrophy: The Plot Thickens
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SYSNO ASEP 0557610 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Planktonic Aggregates as Hotspots for Heterotrophic Diazotrophy: The Plot Thickens Tvůrce(i) Riemann, L. (DK)
Rahav, E. (IL)
Passow, U. (CA)
Grossart, H. (DE)
de Beer, D. (DE)
Klawonn, I. (DE)
Eichner, Meri (MBU-M) ORCID, RID
Benavides, M. (FR)
Bar-Zeev, E. (IL)Číslo článku 875050 Zdroj.dok. Frontiers in Microbiology. - : Frontiers Research Foundation - ISSN 1664-302X
Roč. 13, APR 6 2022 (2022)Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova nitrogen-fixation ; n-2 fixation ; dinitrogen fixation ; microbial-degradation ; bacterial-growth ; organic-carbon ; marine ; sinking ; particles ; cyanobacteria ; aggregates ; nitrogen fixation ; heterotrophic bacteria ; marine ; aquatic ; NCDs Obor OECD Microbiology Způsob publikování Open access Institucionální podpora MBU-M - RVO:61388971 UT WOS 000792026600001 EID SCOPUS 85128591710 DOI 10.3389/fmicb.2022.875050 Anotace Biological dinitrogen (N-2) fixation is performed solely by specialized bacteria and archaea termed diazotrophs, introducing new reactive nitrogen into aquatic environments. Conventionally, phototrophic cyanobacteria are considered the major diazotrophs in aquatic environments. However, accumulating evidence indicates that diverse non-cyanobacterial diazotrophs (NCDs) inhabit a wide range of aquatic ecosystems, including temperate and polar latitudes, coastal environments and the deep ocean. NCDs are thus suspected to impact global nitrogen cycling decisively, yet their ecological and quantitative importance remain unknown. Here we review recent molecular and biogeochemical evidence demonstrating that pelagic NCDs inhabit and thrive especially on aggregates in diverse aquatic ecosystems. Aggregates are characterized by reduced-oxygen microzones, high C:N ratio (above Redfield) and high availability of labile carbon as compared to the ambient water. We argue that planktonic aggregates are important loci for energetically-expensive N-2 fixation by NCDs and propose a conceptual framework for aggregate-associated N-2 fixation. Future studies on aggregate-associated diazotrophy, using novel methodological approaches, are encouraged to address the ecological relevance of NCDs for nitrogen cycling in aquatic environments. Pracoviště Mikrobiologický ústav Kontakt Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Rok sběru 2023 Elektronická adresa https://www.frontiersin.org/articles/10.3389/fmicb.2022.875050/full
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