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Nested clade and phylogeographic analyses of the Chagas disease vector Triatoma brasiliensis in Northeast Brazil

Monteiro, F. A., Donnelly, Martin ORCID:, Beard, C. B. and Costa, J. (2004) 'Nested clade and phylogeographic analyses of the Chagas disease vector Triatoma brasiliensis in Northeast Brazil'. Molecular Phylogenetics and Evolution, Vol 32, Issue 1, pp. 46-56.

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Triatoma brasiliensis (Hemiptera: Reduviidae: Triatominae) is the most important Chagas disease vector in the semiarid areas of Northeast Brazil. We analyzed mitochondrial cytochrome b sequence variation among 136 individuals representing 16 populations from across the species' distribution. Neighbor-joining and parsimony tree-building methods were used in conjunction with nested clade analysis to describe the systematics and phylogeography of this species. Our results indicate that T brasiliensis is composed of four genetically distinct chromatic forms (referred to as brasiliensis, macromelasoma, juazeiro, and melanica) that present inter-population divergence values (0.027-0.119, corrected K2-p) and a pattern of haplotype geographic distribution compatible with the existence of a species complex. As a consequence, such forms can be treated as isolated targets in vector control programs. We were unable to infer what is shaping the population structure of the brasiliensis form as we obtained mutually exclusive causes of structure, namely a barrier to gene flow caused by past population fragmentation, and isolation by distance between populations (which would permit gene flow). We found indication of mitochondrial DNA introgression occurring among forms in putative hybrid zones. (C) 2004 Elsevier Inc. All rights reserved.

Item Type: Article
Uncontrolled Keywords: triatoma brasiliensis cytochrome b phylogeography mtdna speciation chagas disease phenotypic associations cladistic-analysis population history reduviidae haplotypes hemiptera program neiva
Subjects: QX Parasitology > Protozoa > QX 50 Protozoa
QX Parasitology > Insects. Other Parasites > QX 503 Hemiptera (e.g., Bedbugs)
QX Parasitology > Insects. Other Parasites > QX 650 Insect vectors
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 705 Trypanosomiasis
Faculty: Department: Groups (2002 - 2012) > Vector Group
Digital Object Identifer (DOI):
Depositing User: Sarah Lewis-Newton
Date Deposited: 17 Jan 2012 14:15
Last Modified: 16 Sep 2019 09:17


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