Browsing by Autor "Didier Fontenille"

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Active dispersal by wild <i>Triatoma infestans</i> in the Bolivian Andes
(Wiley, 2007) Wilfrid Richer; Pierre Kengne; Mirko Rojas Cortez; Marie Mathilde Perrineau; Anna Cohuet; Didier Fontenille; François Noireau
Triatoma infestans is the main vector of Chagas disease and target of control programmes in the Southern Cone countries. So far Bolivia is the only country where true T. infestans wild foci are documented. The dispersal ability for wild T. infestans was studied at microgeographical scale in Bolivian Andes, to assess the possibility for wild populations to actively recolonize insecticide-treated villages. Nine microsatellite loci were used to detect the extent of gene flow between neighbouring collecting sites. The detection of restricted gene flow between close but distinct sylvatic sites supports the hypothesis that wild T. infestans does not disperse by flying at high altitude (2,750 m asl). It gradually disperses over small distances by walking within a 'patch' of continuous land cover. The genetic differentiation detected between sylvatic and domestic populations suggests a limited short-term role of wild insects in the process of recolonization of insecticide-treated houses in the Andes.
Gene Flow Between Domestic and Sylvan Populations of Aedes aegypti (Diptera: Culicidae) in North Cameroon
(Oxford University Press, 2008) Christophe Paupy; Cécile Brengues; Basile Kamgang; Jean-Pierre Hervé; Didier Fontenille; Frédéric Simard
Polymorphisms at eight microsatellite loci and a fragment of the mitochondrial DNA (mtDNA)-ND4 gene were surveyed in Aedes aegypti (L.) (Diptera: Culicidae) populations collected from six localities in North Cameroon, with emphasis on comparing domestic versus sylvan populations. The microsatellites revealed significant genetic differentiation among sylvan populations, with mean FST = 0.066. Domestic collections were genetically homogeneous (mean FST = 0.012). No pattern of isolation by distance was detected, and one of highest levels of genetic differentiation was estimated between populations sampled a few kilometers apart, each in a distinctly different ecological environment (FST = 0.076). Analyses of mtDNA-ND4 polymorphisms and divergence between the two neighboring populations revealed increased genetic diversity within the domestic population, with molecular signatures suggesting recent demographic expansion, whereas a single haplotype was observed in the sylvan sample. These data suggest reduced gene flow between sylvan and domestic Ae. aegypti populations in North Cameroon, reminiscent of the situation for Ae. aegypti in Kenya in East Africa.
Genetic structure and phylogeography of Aedes aegypti, the dengue and yellow-fever mosquito vector in Bolivia
(Elsevier BV, 2012) Christophe Paupy; Gilbert Le Goff; Cécile Brengues; Mabel Guerra; Jimmy Revollo; Z. Barja Simon; Jean-Pierre Hervé; Didier Fontenille