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Background  The protozoan  Trypanosoma cruzi  circulates in semiarid areas of northeastern Brazil in distinct ecotopes (sylvatic, peridomestic and domestic) where  Triatoma brasiliensis  Neiva, 1911 is the most important Chagas disease vector. In this study, we analyzed microevolutionary and demographic aspects of  T. brasiliensis  populations at the ecotypic, micro and macro-geographic scales by combining morphometrics and molecular results. Additionally, we aimed to address the resolution of both markers for delimiting populations in distinct scales.    Methods  We sampled populations of  T. brasiliensis  from distinct ecotypic and geographic sites in the states Rio Grande do Norte (RN) and Paraíba (PB). The geometric morphometry was carried out with 13 landmarks on the right wings ( n  = 698) and the genetic structure was assessed by sequencing a region of cytochrome  b  mitochondrial gene ( n  = 221). Mahalanobis distance (MD) and coefficient of molecular differentiation (Φ ST ) were calculated among all pairs of populations. The results of comparisons generated MD and Φ ST  dendrograms, and graphics of canonical variate analysis (CVA).    Results  Little structure was observed for both markers for macro-geographic scales. Mantel tests comparing geographic, morphometric and genetic matrices showed low correlation (all  R  2  < 0.35). The factorial graphics built with the CVA evidenced population delimitation for the morphometric data at micro-geographic scales.    Conclusions  We believe that  T. brasiliensis  carries in its genotype a source of information to allow the phenotypical plasticity across its whole distribution for shaping populations, which may have caused a lack of population delimitation for CVAs in morphometric analysis for macro-geographic scale analysis. On the other hand, the pattern of morphometric results in micro-geographic scales showed well-defined groups, highlighting the potential of this tool to inferences on the source for infestation.

parasites and vectors

Drivers of molecular and morphometric variation in Triatoma brasiliensis (Hemiptera: Triatominae): the resolution of geometric morphometrics for populational structuring on a microgeographical scale