SS4.03 Factors Controlling the Bioavailability and Bioaccumulation of Inorganic and Organic Chemicals into Aquatic Food Chains
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
 
PointD, LCABIE Université de Pau et des Pays de l’Adour, Pau, France, david.point@univ-pau.fr
Grall, J, , Laboratoire des Sciences de l'Environnement Marin (LEMAR), Brest, France, jacques.grall@univ-brest.fr
Scancar, J, , LCABIE Université de Pau et des Pays de l’Adour, Pau, France, janez.scancar@univ-pau.fr
Monperrus, M, , LCABIE Université de Pau et des Pays de l’Adour, Pau, France, mathilde.monperrus@univ-pau.fr
Amouroux, D, , LCABIE Université de Pau et des Pays de l’Adour, Pau, France, david.amouroux@univ-pau.fr
Bareille, G, , LCABIE Université de Pau et des Pays de l’Adour, Pau, France, gilles.bareille@univ-pau.fr
Chauvaud, L, , Laboratoire des Sciences de l'Environnement Marin (LEMAR), Brest, France, Laurent.Chauvaud@univ-brest.fr
 
TROPHIC TRANSFER OF METALLIC AND ORGANOMETALLIC CONTAMINANTS IN BENTHIC ORGANISMS OF THE ADOUR ESTUARY AND ADJACENT COASTAL AREA
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The Adour estuary is characterized by an important anthropogenic pressure close to its mouth. Urban and industrial activities contribute to large inputs of contaminants such as heavy metals (Hg, Cu, Zn, …) and organometallic compounds (TBT, MMHg). A sampling campaign was realized in June 2001 in order to collect simultaneously water column, sediment and biological samples along a transect from the inner estuary to the continental shelf (Bay of Biscay). Complementary approaches were performed on each station : chemical speciation of metallic contaminants at the sediment-water interface, and investigation of the biodiversity of benthic macro-organisms. The objectives were to evaluate both biotic indexes defined by the macrobenthic populations, and biogeochemistry of traces metals in water and sediments. The metallic and organometallic contaminants transfer to benthic organisms was also studied. The results indicate that a significant transport of metallic contaminants may occur from the inner estuary to the continental shelf. Additionnaly, biotic indexes developed for coastal benthic organisms exhibit significant alteration of biodiversity in both inner and outer estuary. Interrelationships between contaminant concentrations, trophic levels and benthic biodiversity will be presented.