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• W2036664865 abstract "The hypothesis of optimal host species selection predicts that when a parasitoid has the choice between two host species, it will choose the species that gives the best survival chances for its progeny. We confirmed this hypothesis by laboratory experiments with Leptopilina boulardi Barb. et al., a cynipid parasitoid which prefers Drosophila melanogaster Meigen (the host species most suitable for parasitoid survival) above D. simulans Sturt. As far as fitness parameters are concerned, the fertility of L. boulardi is higher with D. melanogaster, the egg laying can be spread out over a long period when this host is relatively scarce. This does not occur with D. simulans in which parasitic oviposition stops soon when this host is not abundant. Investigations of this foraging strategy were done under more complex natural conditions. We found that L. boulardi has a type III functional response with D. melanogaster only; furthermore, it seems that a switching effect may exist with this host. Parasitoid females appear to distribute their eggs more regularly on D. melanogaster, thus avoiding superparasitism. This seems to be independent of the relative frequency of this host. However, superparasitism of D. simulans did occur more frequently when this host was scarce. Résumé Stratégie de ponte de Leptopilina boulardi (Hyménoptère parasite de drosophiles) dans les conditions naturelles Le concept de réponse optimale d'un parasite vis-à-vis de l'hǒte le plus favorable pour son développement demeure surtout théorique et n'a pu ětre vérifié que dans les conditions de laboratoire. Nous avons montré que Drosophila melanogaster s'avère ětre, par rapport à D. simulans, l'hǒte le plus favorable pour le développement du cynipide parasite Leptopilina boulardi. Une étude sur le terrain a démontré que ce parasite présente une réponse fonctionnelle densité dépendante vis-à-vis de D. melanogaster et non vis-à-vis de D. simulans, avec un effet de bascule. D'autre part, il s'avère que ce parasite exploite beaucoup mieux son hǒte, en évitant le superparasitisme, ceci étant démontré au laboratoire et dans la nature. Enfin, il apparaǐt qu'il est capable d'allonger sa période de ponte lorsque cet hǒte est rare, ce qui ne se produit pas avec D. simulans." @default.
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• W2036664865 date "1987-04-01" @default.
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• W2036664865 title "Egg-laying strategy under natural conditions of Leptopilina boulardi, a hymenopteran parasitoid of Drosophila spp" @default.
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• W2036664865 doi "https://doi.org/10.1111/j.1570-7458.1987.tb03605.x" @default.
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