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Effect of selenium exposure on the freshwater bivalve Corbicula fluminea


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E. Fournier1, C. Adam1, J.C. Massabuau2 and J. Garnier-Laplace1
Radioprotection 2005, Vol. 40, n° Suppl. 1, pages S3 à S9
DOI: 10.1051/radiopro:2005s1-002

Type de document > *Article de revue

Mots clés > radioprotection, bivalve, ENVIRHOM (programme), sélénium, toxicité

Unité de recherche > IRSN/DEI/SECRE/LRE

Auteurs > ADAM Christelle, GARNIER-LAPLACE Jacqueline

Date de publication > 01/06/2005

Résumé

Selenium is essential for most of living organisms. In normoxic to moderately hypoxic freshwaters, Se exists predominantly in the (+VI) and (+IV) oxidation states as selenate and selenite respectively, whereas in the biota it is incorporated as Se (-II) or Se (0). At low concentrations, it acts against oxidative damages, but it may be toxic at higher levels. In filter feeders, such as the freshwater bivalve Corbicula fluminea, the ventilatory activity is a primary limiting step that controls the water influx and therefore the delivery of contaminants. A number of different parameters such as algal food density or presence of contaminant can influence the ventilation and hence the bioaccumulation potential of the contaminant. We report here a set of short-term experiments performed to study the effects of different forms of dissolved Se (selenite, selenate, selenomethionine) and algal-bound Se on the ventilatory activity of Corbicula fluminea and to evaluate the Se bioaccumulation. All experiments were performed on a 3-day exposure period after acclimatizing the organisms during a 7-day period to the synthetic water, at a regulated algal density. Both bioaccumulation and ventilatory activity of Se exposed groups, in comparison to these of the reference group, varied greatly according to the form of Se used.


1 Laboratoire de Radioécologie et d'Écotoxicologie, Institut de Radioprotection et de Sûreté Nucléaire, DEI/SECRE/LRE, Cadarache, Bât. 186, BP. 3, 13115 St-Paul-lez-Durance Cedex, France
2 UMR 5805, Laboratoire d'Écophysiologie et Écotoxicologie des Systémes Aquatiques, Université Bordeaux 1 et CNRS, Place du Dr. Peyneau, 33120 Arcachon, France