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Biodegradation as an important sink of aromatic hydrocarbons in the oceans
IDAEA CSIC, Spain;IQOG CSIC, Spain.
IDAEA CSIC, Spain.
IDAEA CSIC, Spain.
IDAEA CSIC, Spain.
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2019 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 12, no 2, p. 119-125+2Article in journal (Refereed) Published
Abstract [en]

Atmospheric deposition of semivolatile aromatic hydrocarbons accounts for an important input of organic matter to the surface ocean. Nevertheless, the biogeochemical cycling and sinks of semivolatile aromatic hydrocarbons in the ocean remain largely uncharacterized. Here we present measurements of 64 polycyclic aromatic hydrocarbons in plankton and seawater from the Atlantic, Pacific, Indian and Southern Oceans, as well an assessment of their microbial degradation genes. Concentrations of the more hydrophobic compounds decreased when the plankton biomass was higher, consistent with the relevance of the biological pump. The mass balance for the global oceans showed that the settling fluxes of aromatic hydrocarbons in the water column were two orders of magnitude lower than the atmospheric deposition fluxes. This imbalance was high for low molecular weight hydrocarbons, such as phenanthrene and methylphenanthrenes, highly abundant in the dissolved phase. Parent polycyclic aromatic hydrocarbons were depleted to a higher degree than alkylated polycyclic aromatic hydrocarbons, and the degradation genes for polycyclic aromatic hydrocarbons were found to be ubiquitous in oceanic metagenomes. These observations point to a key role of biodegradation in depleting the bioavailable dissolved hydrocarbons and to the microbial degradation of atmospheric inputs of organic matter as a relevant process for the marine carbon cycle.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 12, no 2, p. 119-125+2
National Category
Biological Sciences Earth and Related Environmental Sciences
Research subject
Ecology, Aquatic Ecology; Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-80560DOI: 10.1038/s41561-018-0285-3ISI: 000457194900011Scopus ID: 2-s2.0-85060093202OAI: oai:DiVA.org:lnu-80560DiVA, id: diva2:1289931
Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-08-29Bibliographically approved

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Lundin, Daniel

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CiteExportLink to record
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  • apa
  • harvard1
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  • modern-language-association-8th-edition
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More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
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  • Other locale
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Output format
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