Poster (Scientific congresses and symposiums)
Stable isotope composition spatial variability at microhabitat scale of macrofauna inhabiting a tropical freshwater stream (Pérou River, Guadeloupe)
Lepoint, Gilles; Marichal, Nicolas; Troupin, Charles et al.
2012ISOECOL 2012 (Application of stable isotopes in Ecology
 

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Keywords :
tropical ecosystem; stable isotopes; decapods; Guadeloupe
Abstract :
[en] The spatial variability of isotopic (C and N) composition of freshwater fauna was assessed in a small and pristine tropical stream (Pérou River, Guadeloupe). In order to assess this variability, a section of 80 m was mapped and divided in quadrate (n= 132). Microhabitats (i.e. depth, hydrodynamic facies, presence of litter) were defined for each quadrate. Electric fishing was performed in each quadrate and individual isotopic measurements using EA-IRMS were done using abdominal muscles for crustaceans and lateral muscles for fishes. Isomap was generated for each species. Potential food sources (green ripisylve, macrophytodetritus, epilithic biofilm and deriving organic material) were sampled and analyzed for their isotopic composition. SIAR mixing model was applied to try to delineate isotopic and trophic variability in relation to microhabitat in this river section. Nine species were recorded belonging to four decapod families (n= 8 species) and one fish family (n= 1 species). This fauna, dominated by crustaceans, is typical of high and medium elevations of Caribbean rivers in relatively pristine area. In these turbulent biotopes, species encountered are strongly linked to the hydrological characteristics of their microhabitat and have well defined preferenda. Isotopic compositions of ripisylve material, of deriving matter and of autochtonous biofilm were significantly different for both 13C values and 15N values, allowing to discriminate their respective contributions to consumer diet. Epilithic and epiphytic biofilm appeared to contribute significantly to these diets, but most of the species showed evidence for litter material contribution too. Species repartition and their respective diet were evident at microhabitat scale and strongly related to hydrological regime.
Research center :
DYNECAR (UAG)
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Aquatic sciences & oceanology
Environmental sciences & ecology
Author, co-author :
Lepoint, Gilles  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Marichal, Nicolas;  Université de Liège - ULiège > Biologie, Ecologie, Evolution > Océanologie
Troupin, Charles  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Monti, Dominique;  University of Antilles and Guyana > DYNECAR
Language :
English
Title :
Stable isotope composition spatial variability at microhabitat scale of macrofauna inhabiting a tropical freshwater stream (Pérou River, Guadeloupe)
Publication date :
2012
Event name :
ISOECOL 2012 (Application of stable isotopes in Ecology
Event organizer :
Institut Universitaire Européen de la Mer
Ifremer
CNRS
Event place :
Brest, France
Event date :
from 20-08-12 to 24-08-12
Audience :
International
Name of the research project :
COTEAU : COnnectivité Terre-EAU : Importance des apports terrestres dans le maintien de la biodiversité en crustacés et poissons des rivières antillaises (2010-2012, S. Gobert & G. Lepoint, promoteur : D. Monti, U. Guyane-Antilles)
Funders :
FRB - Fondation pour la Recherche sur la Biodiversité [FR]
Available on ORBi :
since 03 October 2012

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