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Benthic oxygen dynamics and implication for the maintenance of chronic hypoxia and ecosystem degradation in the Berre lagoon (France)

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorRIGAUD, Sylvain
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDEFLANDRE, Bruno
IDREF: 170923509
dc.contributor.authorGRENZ, Christian
dc.contributor.authorCESBRON, Florian
dc.contributor.authorPOZZATO, Lara
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorVOLTZ, Baptiste
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGREMARE, Antoine
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorROMERO-RAMIREZ, Alicia
dc.contributor.authorMIRLEAU, Pascal
dc.contributor.authorMEULE, Samuel
dc.contributor.authorFAURE, Vincent
dc.contributor.authorMAYOT, Nicolas
dc.contributor.authorMICHOTEY, Valerie
dc.contributor.authorBONIN, Patricia
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPASCAL, Ludovic
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCORDIER, Marie-Ange
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLAMARQUE, Bastien
dc.contributor.authorTENORIO, Marcio
dc.contributor.authorRADAKOVITCH, Olivier
dc.date.accessioned2023-11-29T10:08:21Z
dc.date.available2023-11-29T10:08:21Z
dc.date.issued2021-09-05
dc.identifier.issn0272-7714en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/186220
dc.description.abstractEnChronic hypoxia and anoxia have strong impacts on coastal ecosystems worldwide. In shallow coastal ecosystems, such situations are essentially driven by high benthic oxygen (O2) demand resulting from organic matter mineralization in surface sediment and amplified by a low mixing of the water column. However, the benthic O2 demand may greatly vary according to the O2 availability, sediment biogeochemical properties, and bioturbation by macrobenthic fauna. Here we examined how the sediment O2 demand varies in response to seasonal and long-lasting (pluri-decadal) hypoxia in the Berre lagoon, a coastal ecosystem impacted by chronic hypoxia events since 60 years. Oxygen penetration depth, diffusive and total O2 fluxes were measured in situ using a microelectrode autonomous profiler and benthic chamber deployments at three sites impacted by quite-permanent (PA), seasonal (PI) and occasional (PO) hypoxia in August 2016. They were seasonally repeated at site PI between August 2015 and August 2016. Additional physical and chemical characteristics were also measured in surface sediment. Sediment profile images and characteristics of benthic macrofauna communities enabled to estimate the quality of the benthic ecosystem. The highest benthic O2 demand was observed after seasonal anoxia in relation to the important accumulation of reduced chemical species in surface sediment. Interestingly, both pluri-decadal hypoxia and normoxia produced relatively high benthic O2 demand related to a higher accumulation of organic matter and to the presence of reduced chemical species at site dominated by hypoxia, and to the presence of fresher organic matter and active bioturbating macrofaunal communities in normoxic site. The low benthic O2 demand at site seasonally impacted by hypoxia likely resulted from the degraded state of the macrofaunal community and from the lower accumulation of reduced chemical species. The occurrence of hypoxia and anoxia situations in the Berre lagoon was predicted from the competition between kinetics of benthic O2 demand and water column reoxygenation events induced by strong wind. The good agreement between the measured and predicted hypoxia/anoxia occurrence clearly indicates that the chronic deoxygenation events in the Berre lagoon, and the resulting degraded ecological state of the benthic ecosystem are driven both by the benthic O2 demand and by the intensity and duration of the water column stratification. © 2021 Elsevier Ltd
dc.language.isoENen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subject.enOxygen
dc.subject.enCoastal hypoxia
dc.subject.enBiogeochemistry
dc.subject.enSediment-water interface
dc.subject.enBenthic habitat quality
dc.subject.enBerre lagoon
dc.title.enBenthic oxygen dynamics and implication for the maintenance of chronic hypoxia and ecosystem degradation in the Berre lagoon (France)
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.ecss.2021.107437en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalEstuarine, Coastal and Shelf Scienceen_US
bordeaux.volume258en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
dc.rights.ccCC BY-NC-NDen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Estuarine,%20Coastal%20and%20Shelf%20Science&rft.date=2021-09-05&rft.volume=258&rft.eissn=0272-7714&rft.issn=0272-7714&rft.au=RIGAUD,%20Sylvain&DEFLANDRE,%20Bruno&GRENZ,%20Christian&CESBRON,%20Florian&POZZATO,%20Lara&rft.genre=article


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