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Cryptic speciation in Triatoma sordida (Hemiptera: Reduviidae) from the Bolivian Chaco

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Eight natural Bolivian populations of two closely related species of Triatominae, Triatoma sordida and T. guasayana, were analysed by multilocus enzyme electrophoresis at 20 loci. Both species were readily separated and no natural hybrid was observed. Among the silvatic sample of T. sordida, strong departure from panmixia within and between loci was detected in two sites of the Chaco, suggesting two reproductively separate populations easily recognized at Idh2 and Mdh2 loci. Genetic distance between them was in agreement with the hypothesis of distinct species. However, the detection of 3% of putative hybrids suggested a recent evolutionary divergence.

Keywords: Hardy-Weinberg disequilibrium; T. guasayana; Triatoma sordida; linkage disequilibrium; multilocus enzyme electrophoresis (MLEE); speciation

Document Type: Research Article

Affiliations: 1: Institut Francais de Recherche Scientifique pour le Developpement en Cooperation (ORSTOM), La Paz, Bolivia 2: Museo de Historia Natural Noel Kempff M., Santa Cruz, Bolivia 3: Instituto Boliviano de Biologia de Altura (IBBA), La Paz, Bolivia 4: UMR CNRS/ORSTOM, Montpellier, France 5: Centro Nacional de Enfermedades Tropicales (CENETROP), Santa Cruz, Bolivia

Publication date: 1998-05-01

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