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Trophic opportunism of central Amazon floodplain fish

dc.rights.licenseopenen_US
hal.structure.identifierInstitut des Sciences de l'Evolution de Montpellier [UMR ISEM]
dc.contributor.authorMORTILLARO, J. M.
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
dc.contributor.authorPOUILLY, Marc
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
dc.contributor.authorWACH, M.
hal.structure.identifierFederal University of Amazonas
dc.contributor.authorFREITAS, C.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorABRIL, Gwenaël
hal.structure.identifierBiologie des Organismes et Ecosystèmes Aquatiques [BOREA]
dc.contributor.authorMEZIANE, T.
dc.date.accessioned2024-05-31T13:14:41Z
dc.date.available2024-05-31T13:14:41Z
dc.date.issued2015
dc.identifier.issn0046-5070en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200181
dc.description.abstractEn1. The food web of the central Amazon basin displays one of the largest discrepancies in food source utilisation versus availability for consumers. While C 4 macrophytes dominate the primary producing biomass in floodplains, the food web is dominated by the use of C 3 carbon sources. Amazon fish species have wide-ranging diets and show feeding flexibility in response to spatial and temporal patterns in food source availability. Fish are therefore expected to use a range of available resources. Fatty acids and stable carbon and nitrogen isotopic compositions were studied to investigate their trophic behaviour and provide a better assessment of food source utilisation by nine fish species from two Amazon floodplains. 2. Although nitrogen stable isotopes positioned detritivores at the base of the food chain, their large proportions of polyunsaturated fatty acids (FAs) suggest selection of a high-quality food source, such as microalgae. Omnivores and insectivores displayed a wide range of food source utilisation, indicating opportunist feeding behaviour. Piscivores displayed the most 15 N-enriched signature (up to 10.6&), concomitant with their predator position in the studied food web. 3. C 3 carbon was the dominant source for most species, which is a finding consistent with current classical knowledge. However, consumption of C 4 macrophytes was detected for the herbivore Schiz-odon fasciatus, in line with the spatial availability of this food source in the floodplain system. Large amounts of polyunsaturated and essential FAs in these C 4 macrophytes indicate their high nutritive value. Our results suggest that this food source is rather neglected by fish due to low digestibility, with the exception of the herbivore that may possess modification of its digestive system that allows the use of C 4 plants.
dc.language.isoENen_US
dc.subject.enfloodplains
dc.subject.enfish
dc.subject.enfatty acids
dc.subject.enstables isotopes
dc.subject.enAmazon
dc.title.enTrophic opportunism of central Amazon floodplain fish
dc.typeArticle de revueen_US
dc.identifier.doi10.1111/fwb.12598en_US
dc.subject.halSciences de l'environnement/Biodiversité et Ecologieen_US
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnementen_US
bordeaux.journalFreshwater Biologyen_US
bordeaux.page1659-1670en_US
bordeaux.volume60en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue8en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-01913401
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=Freshwater%20Biology&rft.date=2015&rft.volume=60&rft.issue=8&rft.spage=1659-1670&rft.epage=1659-1670&rft.eissn=0046-5070&rft.issn=0046-5070&rft.au=MORTILLARO,%20J.%20M.&POUILLY,%20Marc&WACH,%20M.&FREITAS,%20C.&ABRIL,%20Gwena%C3%ABl&rft.genre=article


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