Effects of marine diesel on microbial diversity and activity in high Arctic beach sediments

Effets du diesel marin sur la diversité et l'activité microbiennes dans les sédiments de plage de l'Extrême-Arctique

Margaux Durand (), David Touchette, Ya-Jou Chen, Elisse Magnuson, Jessica Wasserscheid, Charles Greer, Lyle Whyte and Ianina Altshuler
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Margaux Durand: Department of Natural Resource Sciences - McGill University = Université McGill [Montréal, Canada], NRC - National Research Council of Canada, UMR PSAE - Paris-Saclay Applied Economics - AgroParisTech - Université Paris-Saclay - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement
David Touchette: Department of Natural Resource Sciences - McGill University = Université McGill [Montréal, Canada], EPFL - Ecole Polytechnique Fédérale de Lausanne
Ya-Jou Chen: Department of Natural Resource Sciences - McGill University = Université McGill [Montréal, Canada]
Elisse Magnuson: Department of Natural Resource Sciences - McGill University = Université McGill [Montréal, Canada]
Jessica Wasserscheid: NRC - National Research Council of Canada
Charles Greer: NRC - National Research Council of Canada
Lyle Whyte: Department of Natural Resource Sciences - McGill University = Université McGill [Montréal, Canada]
Ianina Altshuler: Department of Natural Resource Sciences - McGill University = Université McGill [Montréal, Canada], NRC - National Research Council of Canada, EPFL - Ecole Polytechnique Fédérale de Lausanne

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Abstract: Global warming induced sea ice loss increases Arctic maritime traffic, enhancing the risk of ecosystem contamination from fuel spills and nutrient loading. The impact of marine diesel on bacterial metabolic activity and diversity, assessed by colorimetric assay, 16S rRNA and metagenomic sequencing, of Northwest Passage (Arctic Ocean) beach sediments was assessed with nutrient amendment at environmentally relevant temperatures (5 and 15 °C). Higher temperature and nutrients stimulated microbial activity, while diesel reduced it, with metabolism inhibited at and above 0.01 % (without nutrients) and at 1 % (with nutrients) diesel inclusions. Diesel exposure significantly decreased microbial diversity and selected for Psychrobacter genus. Microbial hydrocarbon degradation, organic compound metabolism, and exopolysaccharide production gene abundances increased under higher diesel concentrations. Metagenomic binning recovered nine MAGs/bins with hydrocarbon degradation genes. We demonstrate a nutrients' rescue-type effect in diesel contaminated microbial communities via enrichment of microorganisms with stress response, aromatic compound, and ammonia assimilation metabolisms.

Keywords: Arctic; Metagenome; Diesel contamination; Microbiology (search for similar items in EconPapers)
Date: 2023-09
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Published in Marine Pollution Bulletin, 2023, 194 (Part A), pp.115226. ⟨10.1016/j.marpolbul.2023.115226⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-04345015

DOI: 10.1016/j.marpolbul.2023.115226

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