Cuticular hydrocarbon pattern as a chemotaxonomy marker to assess intraspecific variability in Triatoma infestans, a major vector of Chagas' disease

Triatoma infestans Klug (Hemiptera: Reduviidae) populations were sampled in various localities throughout most of the species' geographic range of distribution in Argentina, Bolivia, Paraguay and Peru. In order to contribute to understanding of the diversity and population structure of this maj...

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Bibliographic Details
Published in:Medical and veterinary entomology 2012-06, Vol.26 (2), p.201-209
Main Authors: CALDERÓN‐FERNÁNDEZ, G. M, GIROTTI, J. R, JUÁREZ, M. P
Format: Article
Language:English
Subjects:
Animals
capillary gas chromatography
Chagas disease
Chagas Disease - transmission
Chagas Disease - veterinary
chemotaxonomy
Chromatography, Gas
cuticular hydrocarbons
Discriminant Analysis
Female
Hemiptera
Humans
hydrocarbons
Hydrocarbons - metabolism
Insect Vectors - classification
Insect Vectors - genetics
Insect Vectors - physiology
Insecticide Resistance
Integumentary System - physiology
intraspecific variability
Male
phenotype
Phylogeny
Population Dynamics
population structure
Principal Component Analysis
Pyrethrins - pharmacology
Reduviidae
South America
statistical analysis
Triatoma - classification
Triatoma - genetics
Triatoma - physiology
Triatoma infestans
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Summary:Triatoma infestans Klug (Hemiptera: Reduviidae) populations were sampled in various localities throughout most of the species' geographic range of distribution in Argentina, Bolivia, Paraguay and Peru. In order to contribute to understanding of the diversity and population structure of this major vector of Chagas' disease, cuticular hydrocarbon (CHC) profiles were analysed by capillary gas chromatography and variations evaluated by statistical methods of classification and ordination. High levels of intrapopulation variation were detected, along with low levels of variability among populations. Based on relative amounts of the major odd‐numbered straight‐chain hydrocarbons n‐C27 to n‐C33, two hydrocarbon phenotypes were evident, unequally distributed along the species' geographic range. Analysis of CHC patterns showed that T. infestans populations segregate into two major groups consisting of an Andean group, which comprises specimens from Peru and most parts of Bolivia, and a non‐Andean group, which includes all specimens from Argentina and Paraguay, together with those from Tarija (Bolivia). Pyrethroid‐resistant and ‐susceptible specimens were differentiated based on relative amounts of some straight and monomethyl‐branched hydrocarbon components.
ISSN:0269-283X
1365-2915
DOI:10.1111/j.1365-2915.2011.00978.x