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The fate of C 4 and C 3 macrophyte carbon in central Amazon floodplain waters: insights from a batch experiment

dc.contributor.authorMORTILLARO, J.M.
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
dc.contributor.authorPASSARELLI, C.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorABRIL, Gwenaël
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
hal.structure.identifierMuséum national d'Histoire naturelle [MNHN]
hal.structure.identifierStation de Biologie Marine de Concarneau
dc.contributor.authorHUBAS, C.
hal.structure.identifierInstitut des Sciences de la Terre d'Orléans - UMR7327 [ISTO]
hal.structure.identifierBiogéosystèmes Continentaux - UMR7327
dc.contributor.authorALBÉRIC, Patrick
dc.contributor.authorARTIGAS, L.F.
hal.structure.identifierInstitut de Physique du Globe de Paris [IPG Paris]
dc.contributor.authorBENEDETTI, M.F.
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
hal.structure.identifierMuséum national d'Histoire naturelle [MNHN]
dc.contributor.authorTHINEY, N.
hal.structure.identifierInstitut de recherche pour le développement [IRD [Burkina Faso]]
dc.contributor.authorMOREIRA-TURCQ, P.
hal.structure.identifierUniversidade Federal Fluminense [Rio de Janeiro] [UFF]
hal.structure.identifierInstitut de Physique du Globe de Paris [IPG Paris]
dc.contributor.authorPEREZ, M.A.P.
hal.structure.identifierUniversidade Federal de Juiz de Fora [UFJF]
dc.contributor.authorVIDAL, L.O.
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
hal.structure.identifierMuséum national d'Histoire naturelle [MNHN]
dc.contributor.authorMEZIANE, T.
dc.date.accessioned2024-05-14T09:47:17Z
dc.date.available2024-05-14T09:47:17Z
dc.date.issued2016-06
dc.identifier.issn0075-9511
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199820
dc.description.abstractEnThe central Amazon floodplains are particularly productive ecosystems, where a large diversity of organic carbon sources are available for aquatic organisms. Despite the fact that C4 macrophytes generally produce larger biomasses than C3 macrophytes, food webs in the central Amazon floodplains appear dominantly based on a C3 carbon source.In order to investigate the respective fate and degradation patterns of C4 and C3 aquatic plant-derived material in central Amazon floodplains, we developed a 23-days batch experiment. Fatty acid and carbon concentrations as well as stable isotope compositions were monitored over time in 60 L tanks. These tanks contained Amazon water, with different biomasses of C3 and C4 macrophyte, representative of in situ densities occurring in central Amazon floodplains.In the C4Paspalum repens treatments, organic (POC, DOC) and inorganic carbon (DIC) got rapidly enriched in 13C, whereas in the C3Salvinia auriculata treatments, POC and DOC showed little change in concentration and isotopic composition, and DIC got depleted in 13C. The contribution of P. repens to POC and DOC was estimated to reach up to 94.2 and 70.7%, respectively. In contrast, no differences were reported between the C3S. auriculata and control treatments, an observation attributed to the lower C3 biomass encountered in the field, to a slower degradation rate of C3 compared to C4 compounds, and to similar isotopic compositions for river POC and DOC, and C3 compounds.The 13C enrichments of POC, DOC, and DIC from P. repens treatments were attributed to an enhanced bacterially-mediated hydrolysis and mineralization of C4 material. Evolutions of bacterial abundance and branched fatty acid concentrations confirmed the role of heterotrophic microbial communities in the high P. repens decomposition rate. Our experiment highlights the predominant role of C4 aquatic plants, as a large source of almost entirely biodegradable organic matter available for heterotrophic activity and CO2 outgassing to the atmosphere.
dc.description.sponsorshipCARBon biogeochemistry and atmospheric exchanges in the AMAzon river system - ANR-08-BLAN-0221
dc.language.isoen
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/
dc.subject.enmacrophytes
dc.subject.enstables isotopes
dc.subject.enfatty acids
dc.subject.enfloodplains
dc.subject.enCentral Amazon
dc.subject.endegradation
dc.title.enThe fate of C 4 and C 3 macrophyte carbon in central Amazon floodplain waters: insights from a batch experiment
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.limno.2016.03.008
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnement
bordeaux.journalLimnologicaen_US
bordeaux.page90-98
bordeaux.volume59
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
bordeaux.import.sourcehal
hal.identifierinsu-01321951
hal.version1
hal.popularnon
hal.audienceInternationale
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
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