Assessing the bioavailability of black carbon-derived dissolved organic matter for marine heterotrophic prokaryotes.

Autor: Martinot PL; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France; Water - Environment - Oceanography (WEO) Department, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam. Electronic address: pauline.martinot@mio.osupytheas.fr., Guigue C; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France; Water - Environment - Oceanography (WEO) Department, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam., Chifflet S; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Cuny P; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Barani A; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Didry M; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Dignan C; Université de Toulon, Aix Marseille Université, CNRS, IRD, MIO, Toulon, France., Guyomarc'h L; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Pradel N; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Pringault O; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Van Wambeke F; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France., Vu CT; Water - Environment - Oceanography (WEO) Department, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam., Mari X; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France; Water - Environment - Oceanography (WEO) Department, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam., Tedetti M; Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France; Water - Environment - Oceanography (WEO) Department, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Nov 25; Vol. 901, pp. 165802. Date of Electronic Publication: 2023 Jul 29.
DOI: 10.1016/j.scitotenv.2023.165802
Abstrakt: Here we investigated the bioavailability of black carbon (BC)-derived dissolved organic matter (DOM) for a natural mixed community of marine heterotrophic prokaryotes. We ran an in vitro biodegradation experiment that took place over 3 months and exposed a community of organisms collected in the northwestern Mediterranean Sea (Bay of Marseille, France) to three different soluble fractions of BC prepared in the laboratory from various fossil fuel combustion particulates: standard diesel (D REF ), oxidized diesel (D REF-OX ), and natural samples of ship soot (D SHIP ). Over the course of the three months, we observed significant decreases in the concentrations of dissolved organic carbon (DOC; from 9 to 21 %), dissolved BC (DBC; from 22 to 38 %) and dissolved polycyclic aromatic hydrocarbons (d-PAH; from 24 to 64 %) along with variability in the growth dynamics and activity of the heterotrophic prokaryotic community. The heterotrophic prokaryotic community exposed to D REF-OX treatment showed the highest values of respiration and production and the highest cell abundance, associated with the highest decrease in DOC (21 %) and d-PAH (64 %) concentrations. In the D REF and D SHIP treatments, prokaryotic activity was oriented towards anabolism. D REF treatment led to the highest decrease in DBC concentration (38 %). D SHIP treatment, which presented a substantially different d-PAH and dissolved metals content to the other two treatments, showed the lowest decreases in DOC, DBC and d-PAH concentrations, as well as the lowest prokaryotic activity and biomasses. Our results indicate that BC-derived DOM, including the most condensed fraction of this material, is partly bioavailable and therefore likely to be assimilated by marine prokaryotes. The origin of BC/soot deposited at the ocean surface turns out to be a key parameter that dictates the efficiency of biodegradation of its dissolved fraction by heterotrophic prokaryotes.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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