title: The sublethal effects of endosulfan on the circadian rhythms and locomotor activity of two sympatric parasitoid species.
abstract: The organochlorine insecticide endosulfan is dispersed worldwide and significantly contributes to environmental pollution. It is an antagonist of the neurotransmitter gamma-aminobutyric acid (GABA), which is also indirectly involved in photoperiodic time measurement. In this study, we show that endosulfan at a dose as low as LC 0.1 modified the rhythm of locomotor activity of two sympatric parasitoid species, Leptopilina boulardi and Leptopilina heterotoma. The insecticide strongly increased the nocturnal activity of both species and synchronized their diurnal activity; these activities were not synchronized under control conditions. Parasitoids are important species in ecosystems because they control the populations of other insects. In this paper, we discuss the possible consequences of these sublethal effects and highlight the importance of such effects in evaluating the consequences of environmental pollution due to insecticides.
authors.affiliation: Université de Lyon, CNRS, Université Claude Bernard Lyon 1, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, 43 boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France. Electronic address: jean-marie.delpuech@univ-lyon1.fr.
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Delpuech
authors.affiliation: Université de Lyon, CNRS, Université Claude Bernard Lyon 1, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, 43 boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Bussod
authors.affiliation: Université de Lyon, CNRS, Université Claude Bernard Lyon 1, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, 43 boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France.
authors.forename: Aurelien
authors.initials: A
authors.lastname: Amar
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000187:drug effects*; D004726:Endosulfan / Q000633:toxicity*; D005260:Female; D006927:Hymenoptera / Q000187:drug effects* / Q000502:physiology; D007306:Insecticides / Q000633:toxicity*; D009043:Motor Activity / Q000187:drug effects*
chemical_list: D007306:Insecticides; D004726:Endosulfan
keywords: Cyclodiene insecticide; Environmental pollution; GABA; Leptopilina boulardi; Leptopilina heterotoma; Organochlorine