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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060 EISSN: 1678-8060
Vol. 94, No. 4, 1999, pp. 451-457
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Bioline Code: oc99083
Full paper language: English
Document type: Research Article
Document available free of charge
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Memórias do Instituto Oswaldo Cruz, Vol. 94, No. 4, 1999, pp. 451-457
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Ecogenetics of Triatoma sordida and Triatoma guasayana (Hemiptera: Reduviidae) in the Bolivian Chaco
François Noireau; Teresa Gutierrez; Rosmary Flores; Frédérique Brenière; Marie France Bosseno & Cristina Wisnivesky-Colli
Abstract
Triatoma guasayana and two putative cryptic species
pertaining to T. sordida complex (named groups 1 and 2)
occur in sympatry in the Bolivian Chaco. Using multilocus enzyme
electrophoresis and subsequent genetic analysis, our work assesses
their population distribution and dispersal capacity in domestic,
peridomestic, and silvatic environments. Our collections by light
trap in the silvatic environment indicated a predominance of T.
guasayana and T. sordida group 2 and a lesser abundance
of T. sordida group 1 ({ or =10% of the total of captures).
Their similar distribution in two silvatic areas 80 km apart
supports the hypothesis of their homogeneous dispersal through the
Bolivian Chaco. The distribution of T. guasayana and T.
sordida groups 1 and 2 was similar between silvatic environment
and peridomestic ecotopes where 25% of positive places was occupied
by two or three species. Bromeliads were confirmed as favorable
shelter for T. guasayana but were free of T. sordida.
T. sordida group 1 and to a lesser extent T.
guasayana would be more invasive vectors for houses than T.
sordida group 2. The spatial partition in the three species
sampled in two distant sites suggested a reduced dispersive
capacity.
Keywords
Triatoma sordida - Triatoma guasayana - distribution - population genetics - multilocus enzyme electrophoresis - Bolivia
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