The fate of C 4 and C 3 macrophyte carbon ...
Document type :
Article dans une revue scientifique: Article original
Title :
The fate of C 4 and C 3 macrophyte carbon in central Amazon floodplain waters: insights from a batch experiment
Author(s) :
Mortillaro, J.M. [Auteur]
Passarelli, C. [Auteur]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Abril, G. [Auteur]
Environnements et Paléoenvironnements OCéaniques [EPOC]
Universidade Federal Fluminense [Rio de Janeiro] [UFF]
Hubas, C. [Auteur]
Station de Biologie Marine de Concarneau
Muséum national d'Histoire naturelle [MNHN]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Albéric, Patrick [Auteur]
Biogéosystèmes Continentaux - UMR7327
Institut des Sciences de la Terre d'Orléans - UMR7327 [ISTO]
Artigas, Luis Felipe [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Benedetti, M.F. [Auteur]
Institut de Physique du Globe de Paris [IPG Paris]
Thiney, N. [Auteur]
Muséum national d'Histoire naturelle [MNHN]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Moreira-Turcq, P. [Auteur]
Institut de recherche pour le développement [IRD [Burkina Faso]]
Perez, M.A.P. [Auteur]
Institut de Physique du Globe de Paris [IPG Paris]
Universidade Federal Fluminense [Rio de Janeiro] [UFF]
Vidal, L.O. [Auteur]
Universidade Federal de Juiz de Fora [UFJF]
Meziane, T. [Auteur]
Muséum national d'Histoire naturelle [MNHN]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Passarelli, C. [Auteur]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Abril, G. [Auteur]
Environnements et Paléoenvironnements OCéaniques [EPOC]
Universidade Federal Fluminense [Rio de Janeiro] [UFF]
Hubas, C. [Auteur]
Station de Biologie Marine de Concarneau
Muséum national d'Histoire naturelle [MNHN]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Albéric, Patrick [Auteur]
Biogéosystèmes Continentaux - UMR7327
Institut des Sciences de la Terre d'Orléans - UMR7327 [ISTO]
Artigas, Luis Felipe [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Benedetti, M.F. [Auteur]
Institut de Physique du Globe de Paris [IPG Paris]
Thiney, N. [Auteur]
Muséum national d'Histoire naturelle [MNHN]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Moreira-Turcq, P. [Auteur]
Institut de recherche pour le développement [IRD [Burkina Faso]]
Perez, M.A.P. [Auteur]
Institut de Physique du Globe de Paris [IPG Paris]
Universidade Federal Fluminense [Rio de Janeiro] [UFF]
Vidal, L.O. [Auteur]
Universidade Federal de Juiz de Fora [UFJF]
Meziane, T. [Auteur]
Muséum national d'Histoire naturelle [MNHN]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Journal title :
Limnologica
Pages :
90-98
Publisher :
Elsevier
Publication date :
2016-07
ISSN :
0075-9511
English keyword(s) :
macrophytes
stables isotopes
fatty acids
floodplains
Central Amazon
degradation
stables isotopes
fatty acids
floodplains
Central Amazon
degradation
HAL domain(s) :
Planète et Univers [physics]/Interfaces continentales, environnement
English abstract : [en]
The 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 ...
Show more >The 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.Show less >
Show more >The 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.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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