PRUSKI, A.M.; DECKER, C.; STETTEN, E.; VÉTION, G.; MARTINEZ, Philippe; CHARLIER, Karine; SENYARICH, C.; OLU, K.

doi:10.1016/j.dsr2.2017.05.011

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PRUSKI, A.M.
Laboratoire d'Ecogéochimie des environnements benthiques [LECOB]

DECKER, C.
Laboratoire Environnement Profond [LEP]

STETTEN, E.
Institut des Sciences de la Terre de Paris [iSTeP]
Laboratoire d'Ecogéochimie des environnements benthiques [LECOB]

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Article de revue

Ce document a été publié dans

Deep Sea Research Part II: Topical Studies in Oceanography. 2017, vol. 142, p. 197-218

Résumé en anglais

Large amounts of recent terrestrial organic matter (OM) from the African continent are delivered to the abyssal plain by turbidity currents and accumulate in the Congo deep-sea fan. In the recent lobe complex, large clusters of vesicomyid bivalves are found all along the active channel in areas of reduced sediment. These soft-sediment communities resemble those fuelled by chemoautotrophy in cold-seep settings. The aim of this study was to elucidate feeding strategies in these macrofaunal assemblages as part of a greater effort to understand the link between the inputs of terrestrially-derived OM and the chemosynthetic habitats. The biochemical composition of the sedimentary OM was first analysed in order to evaluate how nutritious the available particulate OM is for the benthic macrofauna. The terrestrial OM is already degraded when it reaches the final depositional area. However, high biopolymeric carbon contents (proteins, carbohydrates and lipids) are found in the channel of the recent lobe complex. In addition, about one to two thirds of the nitrogen can be assigned to peptide-like material. Even if this soil-derived OM is poorly digestible, turbiditic deposits contain such high amounts of organic carbon that there is enough biopolymeric carbon and proteacinous nitrogen to support dense benthic communities that contrast with the usual depauperate abyssal plains.< Réduire

Mots clés en anglais

Congo deep-sea fan

Food webs

Vesicomyid bivalves

Chemoautotrophy

Isotopic signatures

Fatty acid biomarkers

URI

https://oskar-bordeaux.fr/handle/20.500.12278/202020

DOI

http://dx.doi.org/10.1016/j.dsr2.2017.05.011

Project ANR

Transfert de carbone organique et fonctionnement des écosystèmes dans les lobes terminaux de l'éventail sous-marin du Congo - ANR-11-BS56-0030

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805