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Sedimentary oxygen dynamics in a seasonally hypoxic basin: Sedimentary oxygen dynamics

dc.rights.licenseopenen_US
dc.contributor.authorSEITAJ, Dorina
dc.contributor.authorSULU-GAMBARI, Fatimah
dc.contributor.authorBURDORF, Laurine D. W.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorROMERO RAMIREZ, Alicia
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMAIRE, Olivier
IDREF: 111161525
dc.contributor.authorMALKIN, Sairah Y.
dc.contributor.authorSLOMP, Caroline P.
dc.contributor.authorMEYSMAN, Filip J. R.
dc.date.accessioned2024-10-07T08:28:46Z
dc.date.available2024-10-07T08:28:46Z
dc.date.issued2016-11-14
dc.identifier.issn0024-3590en_US
dc.identifier.urioadoi:http://www.vliz.be/imisdocs/publications/21/301221.pdf
dc.identifier.urioai:crossref.org:10.1002/lno.10434
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/202271
dc.description.abstractEnSeasonal hypoxia refers to the oxygen depletion that occurs in summer in the bottom water of stratified systems, and is increasingly observed in coastal areas worldwide. The process induces a seasonal cycle on the biogeochemistry of the underlying sediments, which remains poorly quantified. Here, we investigated the sedimentary oxygen consumption within Lake Grevelingen (The Netherlands), a saline coastal reservoir that is impacted by yearly recurrent bottom water hypoxia. Monthly sampling campaigns were conducted throughout 2012 at three sites along a depth gradient. Macrofauna sampling and sediment profile imaging demonstrated how summer hypoxia strongly impacts the benthic communities below 15 m of water depth. Benthic fluxes of oxygen, dissolved inorganic carbon, total alkalinity, and ammonium were determined by closed core incubations, while oxygen depth profiles were recorded by microsensor profiling of sediment cores. Our results reveal a pronounced seasonality in the sedimentary oxygen consumption. Low uptake rates in summer were caused by oxygen limitation, and resulted in the build-up of an “oxygen debt” through the accumulation of reduced iron sulfides. Highest oxygen uptake rates were recorded in fall, linked to the reoxidation of the pool of iron sulfides in the top layer. However, uptake rates remained unexpectedly high during winter and early spring, likely associated with the oxidation of iron sulfides down to centimeters depth due to the electrogenic sulfur oxidation by cable bacteria. Overall, our results suggest that the sedimentary oxygen dynamic in seasonally hypoxic coastal systems is characterized by a strongly amplified “oxygen debt” dynamics induced by cable bacteria.
dc.language.isoENen_US
dc.sourceoadoi_repo
dc.sourcecrossref
dc.title.enSedimentary oxygen dynamics in a seasonally hypoxic basin: Sedimentary oxygen dynamics
dc.typeArticle de revueen_US
dc.identifier.doi10.1002/lno.10434en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalLimnology and Oceanographyen_US
bordeaux.page452-473en_US
bordeaux.volume62en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue2en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04723371
hal.version1
hal.date.transferred2024-10-07T08:28:48Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcedissemin
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Limnology%20and%20Oceanography&rft.date=2016-11-14&rft.volume=62&rft.issue=2&rft.spage=452-473&rft.epage=452-473&rft.eissn=0024-3590&rft.issn=0024-3590&rft.au=SEITAJ,%20Dorina&SULU-GAMBARI,%20Fatimah&BURDORF,%20Laurine%20D.%20W.&ROMERO%20RAMIREZ,%20Alicia&MAIRE,%20Olivier&rft.genre=article


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