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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The influence of predation on the chronic response of Artemia sp populations to a toxicant
Auteurs :	Mikhail A. Beketov, Auteur ; Matthias Liess, Auteur
Type de document :	Article
Dans :	Journal of Applied Ecology (43(6) DEC 2006)
Article en page(s) :	1069-1074
Langues:	Anglais
Résumé :	1. Environmental risk assessment of contaminants is conventionally based on toxic effects assessed in organism-level test systems. We suggest that, for the prediction of toxicant effects, population- and community-level effects should be considered. The aim of this study was to investigate how predation could alter a prey population's response to a toxicant to reveal effects at population and community levels. 2. Populations of the brine shrimp Artemia sp. were maintained in the laboratory with and without simulated predation. Individuals were exposed for 1 h to the pyrethroid insecticide esfenvalerate (0, 0.01, 0.04 and 0.08 mu g L(-1)) and subsequently observed for 6 weeks. 3. Unpredated exposed populations showed a reduced population density compared with the control. However, even at the highest concentration of insecticide, populations were sustained until the end of the experiment. The lower density in the exposed populations led to reduced competition and subsequently to enhanced development of surviving individuals and an increased proportion of young individuals. In contrast, the combination of predation and short-term toxicant exposure at concentrations of 0.04 and 0.08 mu g L(-1) produced extinction of the populations after 39 and

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