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2 resultados encontrados para: AUTOR: Catalá, Silvia S.
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- Artículo con arbitraje
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Electroantennogram responses of the Triatoma dimidiata complex to volatiles produced by its exocrine glands
May Concha, Irving Jesús ; Guerenstein, Pablo G. (coaut.) ; Malo Rivera, Edi Álvaro (coaut.) ; Catalá, Silvia S. (coaut.) ; Rojas, Julio C. (coaut.) ;
Contenido en: Acta Tropica Vol. 185 (September 2018), p. 336-343 ISSN: 0001-706X
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Resumen en: Inglés |
Resumen en inglés

Members of the Triatoma dimidiata complex are vectors of the protozoan parasite Trypanosoma cruzi, the etiologic agent of Chagas disease. Morphological and genetic studies indicate that T. dimidiata complex has three principal haplogroups in Mexico. However, whether there are differences in the olfactory physiology among the haplogroups of this complex and a possible correlation with their antennal phenotype are not yet known. Antennal responses to 13 compounds released from the metasternal and Brindley´s glands, which are involved in the alarm and mating-related behaviours of T. dimidiata were investigated using electroantennography (EAG). Overall, of the 13 compounds tested, seven triggered EAG responses in both sexes of three Mexican haplogroups. The sensitivity of the EAG responses show some relationship with the total number of chemo-sensilla present on the antennae. Antennal sensitivity was different between sexes and haplogroups of the T. dimidiata complex. Discriminant analysis of EAG sensitivity was significant, separating the three haplogroups. Our finding is consistent with morphological and genetic evidence for haplogroups distinction within the complex.

- Artículo con arbitraje
Antennal phenotype of Mexican haplogroups of the Triatoma dimidiata complex, vectors of Chagas disease
May Concha, Irving Jesús (autor) ; Guerenstein, Pablo G. (autor) ; Ramsey Willoquet, Janine M. (autor) ; Rojas, Julio C. (autor) ; Catalá, Silvia S. (autora) ;
Contenido en: Infection, Genetics and Evolution Vol. 40 (June 2016), p. 73–79 ISSN: 1567-1348
Resumen en: Inglés |
Resumen en inglés

Triatoma dimidiata (Latreille) is a species complex that spans North, Central, and South America and which is a key vector of all known discrete typing units (DTU) of Trypanosoma cruzi, the etiologic agent of Chagas disease. Morphological and genetic studies indicate that T. dimidiata is a species complex with three principal haplogroups (hg) in Mexico. Different markers and traits are still inconclusive regarding if other morphological differentiation may indicate probable behavioral and vectorial divergences within this complex. In this paper we compared the antennae of three Mexican haplogroups (previously verified by molecular markers ND4 and ITS-2) and discussed possible relationships with their capacity to disperse and colonized new habitats. The abundance of each type of sensillum (bristles, basiconics, thick- and thin-walled trichoids) on the antennae of the three haplogroups, were measured under light microscopy and compared using Kruskal–Wallis non-parametric and multivariate non-parametric analyses. Discriminant analyses indicate significant differences among the antennal phenotype of haplogroups either for adults and some nymphal stages, indicating consistency of the character to analyze intraspecific variability within the complex. The present study shows that the adult antennal pedicel of the T. dimidiata complex have abundant chemosensory sensilla, according with good capacity for dispersal and invasion of different habitats also related to their high capacity to adapt to conserved as well as modified habitats.

However, the numerical differences among the haplogroups are suggesting variations in that capacity. The results here presented support the evidence of T. dimidiata as a species complex but show females and males in a different way. Given the close link between the bug's sensory system and its habitat and host-seeking behavior, AP characterization could be useful to complement genetic, neurological and ethological studies of the closely related Dimidiata Complex haplogroups for a better knowledge of their vectorial capacity and a more robust species differentiation.