CRILAR   12590
CENTRO REGIONAL DE INVESTIGACIONES CIENTIFICAS Y TRANSFERENCIA TECNOLOGICA DE LA RIOJA
Unidad Ejecutora - UE
artículos
Título:
Phenotypic Variability of Rhodnius ecuadoriensis populations at the Ecuadorian central and southern Andean region.
Autor/es:
VILLACIS A, GRIJALBA M, CATALÁ S.
Revista:
Journal of Medical entomology
Editorial:
ENTOMOLOGICAL SOC AMER
Referencias:
Año: 2010 vol. 47 p. 1034 - 1043
ISSN:
0022 2585
Resumen:
Rhodnius ecuadoriensis is an important vector of Chagas disease in Ecuador. Whereas
only sylvatic and peridomestic populations are common in Manabõ´ province, this species occupies
domestic, peridomestic, and sylvatic habitats in Loja province where high reinfestation of houses was
observed. To explore the existence of phenetic changes linked to the domiciliation of the species, this
study set out to analyze the wing and antennal phenotypes of R. ecuadoriensis in these two provinces
where the vector presents different afÞnity for domestic habitats. The antennal phenotype and the
wing size and shape distinguish the two geographical populations of R. ecuadoriensis. In Manabõ´,
sylvatic and peridomestic specimens were very similar. In Loja, sylvatic and nonsylvatic (domestic and
peridomestic) populations showed distinctive characteristics. Remarkable sexual dimorphism of wing
and antenna, exclusive of domestic specimens, and high metric disparity in the wing shape of the
domestic females point out the existence of a particular situation in this habitat. The results of this
phenotypic analysis and previous evidence of behavioral differences support the hypothesis of
disruptive selection acting upon R. ecuadoriensis population.