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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 104, No. 8, 2009, pp. 1165-1170
Bioline Code: oc09232
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 104, No. 8, 2009, pp. 1165-1170

 en Ecological niche modelling and differentiation between Rhodnius neglectus check for this species in other resources Lent, 1954 and Rhodnius nasutus check for this species in other resources Stål, 1859 (Hemiptera: Reduviidae: Triatominae) in Brazil
Batista, Taíza Almeida & Gurgel-Gonçalves, Rodrigo

Abstract

Ecological niche modelling was used to predict the potential geographical distribution of Rhodnius nasutus check for this species in other resources Stål and Rhodnius neglectus check for this species in other resources Lent, in Brazil and to investigate the niche divergence between these morphologically similar triatomine species. The distribution of R. neglectus covered mainly the cerrado of Central Brazil, but the prediction maps also revealed its occurrence in transitional areas within the caatinga, Pantanal and Amazon biomes. The potential distribution of R. nasutus covered the Northeastern Region of Brazil in the semi-arid caatinga and the Maranhão babaçu forests. Clear ecological niche differences between these species were observed. R. nasutus occurred more in warmer and drier areas than R. neglectus. In the principal component analysis PC1 was correlated with altitude and temperature (mainly temperature in the coldest and driest months) and PC2 with vegetation index and precipitation. The prediction maps support potential areas of co-occurrence for these species in the Maranhão babaçu forests and in caatinga/cerrado transitional areas, mainly in state of Piaui. Entomologists engaged in Chagas disease vector surveillance should be aware that R. neglectus and R. nasutus can occur in the same localities of Northeastern Brazil. Thus, the identification of bugs in these areas should be improved by applying morphometrical and/or molecular methods.

Keywords
Rhodnius neglectus - Rhodnius nasutus - GARP - geographical distribution - ecological niche modelling - Brazil

 
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