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Influence of toxic cyanobacteria on community structure and microcystin accumulation of freshwater molluscs

TitreInfluence of toxic cyanobacteria on community structure and microcystin accumulation of freshwater molluscs
Type de publicationJournal Article
Year of Publication2009
AuteursGerard, C, Poullain, V, Lance, E, Acou, A, Brient, L, Carpentier, A
JournalEnvironmental Pollution
Volume157
Pagination609–617
ISSN0269-7491
Résumé

Community structure and microcystin accumulation of freshwater molluscs were studied before and after cyanobacterial proliferations, in order to assess the impact of toxic blooms on molluscs and the risk of microcystin transfer in food web. Observed decrease in mollusc abundance and changes in species richness in highly contaminated waters were not significant; however. relative abundances of taxa (prosobranchs, pulmonates, bivalves) were significantly different before and after cyanobacterial bloom. Pulmonates constituted the dominant taxon, and bivalves never occurred after bloom. Microcystin accumulation was significantly higher in molluscs from highly (versus lowly) contaminated waters, in adults (versus juveniles) and in pulmonates (versus prosobranchs and bivalves). Results are discussed according to the ecology of molluscs, their sensitivity and their ability to detoxify. (C) 2008 Elsevier Ltd. All rights reserved.

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DOI10.1016/j.envpol.2008.08.017