caa a22 4500 445378506 CHVBK 20180317143010.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10393-011-0695-9 doi (NATIONALLICENCE)springer-10.1007/s10393-011-0695-9 Modifications of Trichogramma Behaviors During the Exploitation of Host Patches Induced by the Insecticide Chlorpyrifos [Elektronische Daten] [Jean-Marie Delpuech, Lucas Leger] Parasitoid species are key species because they regulate numerous insect species, including pests. An efficient infestation of hosts is critical to the development of parasitoid populations. In this article, we investigate the effects of the widely used insecticide chlorpyrifos on the exploitation of a patch of host by a parasitoid, Trichogramma brassicae. We show that chlorpyrifos increased the efficiency of parasitoid females in the infestation of the first host egg by decreasing its super-parasitization. Except for the first egg, all infested eggs were infested only once by both control and treated females; therefore, the insecticide did not impede the detection of a host that had already been infested. We did find that the insecticide affected the mode of rejection of infested eggs. At the beginning of the exploitation of the patch, females exposed to the insecticide made more antennal rejections than controls but eventually made more ovipositor rejections. These results suggest that the insecticide initially stimulated the antennal perception of the infested host but finally led to the saturation of this perception. Parasitoids compensated for this loss of antennal perception via ovipositor perception of infested eggs. This switch of behavior corresponds to a decrease in efficiency, as it is much more time consuming; therefore, females exposed to the insecticide had to stay longer on the patch for an equal rate of exploitation relative to controls. The infestation of host eggs is a crucial behavior for parasitoids, enabling their reproduction and the development of their species. By decreasing the antennal recognition of infested eggs, chlorpyrifos continues to be detrimental even when parasitoids survive exposure. International Association for Ecology and Health, 2011 organophosphorus nationallicence sublethal effects nationallicence Trichogramma brassicae nationallicence parasitoid nationallicence biological control nationallicence infestation nationallicence Delpuech Jean-Marie 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 aut Leger Lucas 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 aut EcoHealth Springer-Verlag 8/2(2011-06-01), 190-198 1612-9202 8:2<190 2011 8 10393 https://doi.org/10.1007/s10393-011-0695-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10393-011-0695-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Delpuech Jean-Marie 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 aut NATIONALLICENCE 700 1- Leger Lucas 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 aut NATIONALLICENCE 773 0- EcoHealth Springer-Verlag 8/2(2011-06-01), 190-198 1612-9202 8:2<190 2011 8 10393 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer