Reference : Epilithic biofilm as a key factor for small-scale river fisheries on Caribbean Islands
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/78266
Epilithic biofilm as a key factor for small-scale river fisheries on Caribbean Islands
English
Lefrançois, E. [Université des Antilles et de la Guyane (UAG) > Biologie > Dynamique des Ecosystèmes des Caraibbe (DYNECAR) > >]
Coat, Sophie [Université des Antilles et de la Guyane (UAG) > Biologie > Dynamique des Ecosystèmes des Caraibbe (DYNECAR) > >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Vachiéry, N. [Institut Scientifique de Recherche Agronomique - INRA (France) > > > >]
Gros, Olivier [Université des Antilles et de la Guyane (UAG) > Biologie > Dynamique des Ecosystèmes des Caraibbe (DYNECAR) > >]
Monti, Dominique mailto [Université des Antilles et de la Guyane (UAG) > Biologie > Dynamique des Ecosystèmes des Caraibbe (DYNECAR) > >]
2011
Fisheries Management & Ecology
Blackwell Publishing
Yes (verified by ORBi)
International
0969-997X
Oxford
United Kingdom
[en] guadeloupe ; stable isotope ; biofilm ; trophic web ; tropical river ; detritus
[en] Numerous freshwater species are consumed or exploited through artisanal fisheries in the rivers of the islands of Guadeloupe, French West Indies. Autochthonous production of organic matter is limited in these flowing rivers and is mainly represented by scarce filamentous green algae and an abundant epilithic biofilm growing on wet stones in the river bed. Stable isotope analysis was used to quantify the relative importance of biofilm and other riverine allochthonous and autochthonous food sources in the diet of tropical shrimps (Palaemonidae, Atyidae and Xiphocarididae) and fishes (Gobiidae and Eleotridae) consumed by the local people. The epilithic biofilm was exploited by most species, constituted an important source of autochthonous carbon and wasan important source of organic matter production at the base of freshwater food webs in Caribbean rivers. Biofilm percentages in the diet reached 32% for molluscs, 85% for atyid shrimps, 29% for xiphocaridid shrimps, 14% for palaemonid shrimps and 13% for fish. Assessment of biofilm in nine rivers showed that blue and red cyanobacteria were quantitatively dominant with a moderately rich diatom flora. These results address the interactions between river biofilm and Caribbean freshwater fauna where trophic links between consumers and their potential resources have poorly been documented.
Centre Interfacultaire de Recherches en Océanologie - MARE ; DYNECAR-Université des Antilles et de la Guyane
Ministère del'Outre-Mer (France) (grant07GUA6)
Researchers
http://hdl.handle.net/2268/78266

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