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Using recent high-frequency surveys to reconstitute 35 years of organic carbon variations in a eutrophic lowland river

dc.rights.licenseopenen_US
hal.structure.identifierGéoHydrosystèmes COntinentaux [GéHCO]
dc.contributor.authorMINAUDO, Camille
hal.structure.identifierGéoHydrosystèmes COntinentaux [GéHCO]
dc.contributor.authorMOATAR, Florentina
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCOYNEL, Alexandra
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorETCHEBER, Henri
hal.structure.identifierGéoHydrosystèmes COntinentaux [GéHCO]
dc.contributor.authorGASSAMA, Nathalie
hal.structure.identifierGéoHydrosystèmes COntinentaux [GéHCO]
dc.contributor.authorCURIE, Florence
dc.date.accessioned2024-10-11T07:55:41Z
dc.date.available2024-10-11T07:55:41Z
dc.date.issued2016-01
dc.identifier.issn0167-6369en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/202419
dc.description.abstractEnConcentrations of dissolved and particulate organic carbon (DOC and POC), total suspended solids (TSS), were measured daily, and phytoplankton pigments (chlorophyll-a and pheopigments) were measured every 3 days at three strategic stations along the eutrophic Loire River between November 2011 and November 2013 marked by a high annual and seasonal variability in hydrological regimes. This unique high-frequency dataset allowed to determine the POC origin (autochthonous or allochthonous). Some strong relationships were evidenced between POC, total pigments and TSS and were tested on a long-term database with a lower frequency (monthly data) to reconstitute unmeasured algal and detrital POC concentrations and estimate annual total organic carbon (TOC) fluxes from 1980 onwards. The results were subjected to only ≈25 % uncertainty and showed that the annual TOC fluxes at the outlet of the Loire River decreased from 520 103 tC year−1 (i.e. 4.7 t km−2 year−1) in the early 1990s to 150 103 tC year−1 (i.e. 1.4 t km−2 year−1) in 2012. Although DOC always dominates, the autochthonous POC represented 35 % of the TOC load at the basin outlet by the end of the 1980s and declined to finally represent 15 % only of the TOC. The control of phosphorus direct inputs and the invasion by Corbicula clams spp. which both occurred since the early 1990s probably highly reduced the development of phytoplankton. Consequently, the autochthonous POC contribution declined and TSS concentrations in summertime significantly decreased as well as a result of both less phytoplankton and less calcite precipitation. At the present time, at least 75 % of the POC has allochthonous origins in the upper Middle Loire but downstream, autochthonous POC dominates during summer phytoplanktonic blooms when total pigments concentrations reach up to 70 μg L−1 (equivalent to 75 % of the total POC).
dc.language.isoENen_US
dc.subject.enOrganic carbon
dc.subject.enRiver eutrophication
dc.subject.enCarbon speciation
dc.subject.enLoire
dc.title.enUsing recent high-frequency surveys to reconstitute 35 years of organic carbon variations in a eutrophic lowland river
dc.typeArticle de revueen_US
dc.identifier.doi10.1007/s10661-015-5054-9en_US
dc.subject.halSciences de l'environnement/Milieux et Changements globauxen_US
bordeaux.journalEnvironmental Monitoring and Assessmenten_US
bordeaux.page41en_US
bordeaux.volume188en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamTGMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02377291
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Environmental%20Monitoring%20and%20Assessment&rft.date=2016-01&rft.volume=188&rft.issue=1&rft.spage=41&rft.epage=41&rft.eissn=0167-6369&rft.issn=0167-6369&rft.au=MINAUDO,%20Camille&MOATAR,%20Florentina&COYNEL,%20Alexandra&ETCHEBER,%20Henri&GASSAMA,%20Nathalie&rft.genre=article


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