The number of families of Triatoma dimidiata in a Guatemalan house

Melgar, Sergio; Chávez, Juan José; Landaverde-González, Patricia; Herrera, Franklin; Rodas, Antonieta; Enríquez, Eunice; Dorn, Patricia L.; Monroy, Carlota

doi:10.1590/s0074-02762007005000001

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…On the other hand, there is molecular evidence that, within a single house in Guatemala, the T. dimidiata population is mostly composed of genetically unrelated individuals rather than siblings and that families of siblings are small. 27 This is also in agreement with population genetics data, indicating that 10-50% of domestic T. dimidiata are actually coming from peri-domestic and sylvatic areas. 7 Indeed, because these estimates are based on genetic or morphometric differentiation of bugs, they may provide an estimation of the minimum immigration detectable with these tools.…”

Section: Discussionsupporting

confidence: 88%

“…7,25,26 Population size at equilibrium was considered consistent with the field data when they were between 1 and 100, because the average population size per house is typically ∼5-20, 4,5 up to 100 insects/house/yr. 27 The theoretical proportion of adults (with or without immigration) was considered to conform to the data when the number of adults as part of the whole population was > 80%. 4…”

Section: Range Of Demographic and Dispersal Parameters Consistentmentioning

confidence: 99%

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Demographic and Dispersal Constraints for Domestic Infestation by Non-Domicilated Chagas Disease Vectors in the Yucatan Peninsula, Mexico

Gourbière¹,

Dumonteil²,

Rabinovich³

et al. 2008

The American Journal of Tropical Medicine and Hygiene

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Chagas disease is one of the most important diseases in Latin America. Insecticides have been sprayed to control domiciliated vectors. However, some triatomine species are not strictly domiciliated, and the transmission risk posed by immigrants is identified as a major challenge. The design of new control strategies requires disentangling the importance of demography and immigration in vector occurrence inside houses. Using a population dynamics model, we confirmed that dispersal can explain satisfactorily the domestic abundance of Triatoma dimidiata in Yucatan, Mexico. A surprisingly low fecundity was also required (no more than one to two female offspring per female per trimester). A wide range of survival probabilities was possible, although the best fit was obtained for a very low immature survival (< or = 0.01/trimester). Our model predicted that domestic populations are not sustainable, and up to 90% of the individuals found in houses are immigrants. We discuss the potential of different strategies to control the transmission of Chagas disease by non-domiciliated vectors.

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Section: Discussionsupporting

confidence: 88%

Section: Range Of Demographic and Dispersal Parameters Consistentmentioning

confidence: 99%

Demographic and Dispersal Constraints for Domestic Infestation by Non-Domicilated Chagas Disease Vectors in the Yucatan Peninsula, Mexico

Gourbière¹,

Dumonteil²,

Rabinovich³

et al. 2008

The American Journal of Tropical Medicine and Hygiene

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“…Undoubtedly the fact that T. dimidiata females released volatiles during mating to attract males provides an advantage for polyandry. Melgar et al (2007) suggested that polyandry exists as a mating system for T. dimidiata, and that the female volatiles that attract males could be related to this mating system, as also suggested for other triatomine bugs (Crespo & Manrique, 2007;Pontes & Lorenzo, 2012). However, the biological significance of the attraction of males to volatiles from other males is difficult to explain.…”

Section: Nomentioning

confidence: 95%

Volatile compounds emitted by Triatoma dimidiata, a vector of Chagas disease: chemical analysis and behavioural evaluation

May-Concha

Rojas

Cruz‐López

et al. 2012

Medical Vet Entomology

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In this study, we evaluated the responses of Triatoma dimidiata Latreille (Hemiptera: Reduviidae) to volatiles emitted by conspecific females, males, mating pairs and metasternal gland (MG) extracts with a Y-tube olfactometer. The volatile compounds released by mating pairs and MGs of T. dimidiata were identified using solid-phase microextraction and coupled gas chromatography-mass spectrometry (GC-MS). Females were not attracted to volatiles emitted by males or MG extracts; however, they preferred clean air to their own volatiles or those from mating pairs. Males were attracted to volatiles emitted by males, females, mating pairs, pairs in which the male had the MG orifices occluded or MG extracts of both sexes. However, males were not attracted to volatiles emitted by pairs in which the female had the MG orifices occluded. The chemical analyses showed that 14 and 15 compounds were detected in the headspace of mating pairs and MG, respectively. Most of the compounds identified from MG except for isobutyric acid were also detected in the headspace of mating pairs. Both females and males were attracted to octanal and 6-methyl-5-hepten-2-one, and males were attracted to 3,5-dimethyl-2-hexanol. Males but not females were attracted to a seven-compound blend, formulated from compounds identified in attractive MG extracts.

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“…Surprisingly, in areas apparently lacking sylvan populations, high levels of migration among houses within a village and nearby villages are inferred by high gene flow (Dorn et al, 2003;Stevens et al, unpublished data; Table 2). A finding of mostly unrelated or distantly related individuals within a house by random amplification of polymorphic DNA-PCR (RAPD-PCR) (Melgar et al, 2007) also supports substantial movement by T. dimidiata. R. prolixus also shows movement between most sylvan and domestic populations, indicating that sylvan populations can pose a risk for human infection (Fitzpatrick et al, 2008; Table 2).…”

Section: Genetic Diversitymentioning

confidence: 81%

Genetics and evolution of triatomines: from phylogeny to vector control

et al. 2011

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Triatomines are hemipteran bugs acting as vectors of the protozoan parasite Trypanosoma cruzi. This parasite causes Chagas disease, one of the major parasitic diseases in the Americas. Studies of triatomine genetics and evolution have been particularly useful in the design of rational vector control strategies, and are reviewed here. The phylogeography of several triatomine species is now slowly emerging, and the struggle to reconcile the phenotypic, phylogenetic, ecological and epidemiological species concepts makes for a very dynamic field. Population genetic studies using different markers indicate a wide range of population structures, depending on the triatomine species, ranging from highly fragmented to mobile, interbreeding populations. Triatomines transmit T. cruzi in the context of complex interactions between the insect vectors, their bacterial symbionts and the parasites; however, an integrated view of the significance of these interactions in triatomine biology, evolution and in disease transmission is still lacking. The development of novel genetic markers, together with the ongoing sequencing of the Rhodnius prolixus genome and more integrative studies, will provide key tools to expanding our understanding of these important insect vectors and allow the design of improved vector control strategies.

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The number of families of Triatoma dimidiata in a Guatemalan house

Cited by 12 publications

References 19 publications

Demographic and Dispersal Constraints for Domestic Infestation by Non-Domicilated Chagas Disease Vectors in the Yucatan Peninsula, Mexico

Demographic and Dispersal Constraints for Domestic Infestation by Non-Domicilated Chagas Disease Vectors in the Yucatan Peninsula, Mexico

Volatile compounds emitted by Triatoma dimidiata, a vector of Chagas disease: chemical analysis and behavioural evaluation

Genetics and evolution of triatomines: from phylogeny to vector control

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