Morphological evidence suggests homoploid hybridization as a possible mode of speciation in the Triatominae (Hemiptera,Heteroptera, Reduviidae) |
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Authors: | Jane Costa A. Townsend Peterson Jean Pierre Dujardin |
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Affiliation: | 1. Grupo Biología y Control de Enfermedades Infecciosas — BCEI, Universidad de Antioquia, Calle 70 No. 52-21, Medellin, Colombia;2. Laboratorio de Parasitología, Instituto Hideyo Noguchi, Universidad Autónoma de Yucatán, Mérida, Mexico;3. Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA;1. Instituto de Medicina Tropical de São Paulo, Universidade de São Paulo, São Paulo, Brazil;2. Faculdade de Ceilândia, Universidade de Brasília, Brasília, Brazil;3. Laboratório de Parasitologia Médica e Biologia de Vetores, Área de Patologia, Faculdade de Medicina, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brazil;4. Departamento de Epidemiologia, Faculdade de Saúde Pública, Universidade de São Paulo, São Paulo, Brazil;1. Laboratório de Biodiversidade Entomológica,Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brazil;2. Dep. de Parasitología, Facultad de Farmacia, Univ. de Valencia, Burjassot, Valencia, Spain;3. Entomology Branch, Div. Parasitic Diseases, CDC, Atlanta, GA, USA;4. Laboratório de Fisiologia e Bioquímica de Insetos Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brazil;5. Secretaria de Vigilância em Saúde, Pernambuco, Brazil;6. Laboratório de Genética Humana, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brazil;7. Laboratório de Eco-epidemiologia da Doença de Chagas, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brazil;8. Centro de Des. Tecnológico em Saúde/Fiocruz, CDTS, Rio de Janeiro, RJ, Brazil;9. Univers. Est. Paulista Júlio de Mesquita Filho, Araquara, SP, Prog. de Pós-Graduação em Ecologia e Monitoramento Ambiental (PPGEMA), UFPB, Campus IV, Paraíba, Brazil;10. Institute de Recherche pour le Development, Montpelier, France |
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Abstract: | All known significant insect vectors of Trypanosoma cruzi are members of the Reduviidae, subfamily Triatominae. Infections with this parasite are the cause of Chagas disease, the single most costly parasitic disease in the Western Hemisphere. The Triatominae are almost completely restricted to the Americas, with >130 species distributed in several foci of species richness and endemism; nevertheless, the processes involved in the diversification of this group remain poorly understood. The Triatoma brasiliensis species complex was recently proposed based on geography, morphology, ecology, and molecular data, and is believed to comprise two species and two subspecies. Here, we report results from a broad series of studies, in which first-generation offspring of experimental crosses were studied in terms of wing morphometry and phylogenetic position. Morphometrics, morphological, ecological and geographic analyses were consistent with the hypothesis of T. brasiliensis macromelasoma as a product of hybridization between two others (T. brasiliensis brasiliensis and T. juazeirensis). Although evidence is supportive of the hypothesis of speciation via hybridization as a mode of triatomine diversification, the case is not as-yet conclusive, and confirmation via molecular markers is necessary. |
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