Identification spécifique et structure génétique des populations du papillon-cendre responsable des épisodes de papillonite en Guyane et au Vénézuela

Abstract : The genus Hylesia (Lepidoptera Saturniidae) are moths of human health importance in Venezula and French Guiana, inducing epidemic outbreaks of lepidopterism, a puriginous dermatitis caused by the urticating properties of the females’ abdominal setae. Adult female releases extremely urticating setae in the surrounding air, causing itchy dermatitis known as ‘papillonite’. Hylesia are attracted by artificial light source which are increasing since the end of the 19th century due to urbanization resulting in serious invasion event in towns and villages. Despite of the impact on human health, many aspects of the biology and their ecology remain unclear. The definition of specific methods of population regulation is thus very urgent but it was necessary first of all to verify that only the species H. metabus is involved in these episodes of urtication and to specify the population structure of these insects. It was also important to clarify the mechanisms for recognizing sexual partners in this same species. These questions were the mainobjectives of this thesis.The use of molecular tools has shown that a single species, Hylesia metabus, was involved in recent episodes ofurtication in Guyana and Venezuela. The study also demonstrated that the Guyanese populations of this species aregenetically distinct from the Venezuelan populations, and especially that they are structured in 2 distinct genetic subgroupsbetween the coast and the interior of French Guiana. All insects collected during outbreaks belonged to thecoastal subset. An approach based on the study of reproductive behavior has been used to clarify the temporality ofemission of the sex pheromone and opens new perspectives for the identification of this pheromone
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Marina Ciminera. Identification spécifique et structure génétique des populations du papillon-cendre responsable des épisodes de papillonite en Guyane et au Vénézuela. Sciences agricoles. Université de Guyane, 2017. Français. ⟨NNT : 2017YANE0016⟩. ⟨tel-01834559v2⟩

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