Aspectos ecológicos da tripanossomíase americana: VII. Permanência e mobilidade do Triatoma sordida em relação aos ecótopos artificiais

Forattini, Oswaldo Paulo; Ferreira, Octávio Alves; Silva, Eduardo Olavo da Rocha e; Rabello, Ernesto Xavier

doi:10.1590/s0034-89101975000400003

Cited by 22 publications

(4 citation statements)

References 2 publications

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“…Fisher’s sexual allocation theory predicts that a balanced sex ratio will nearly always evolve in stable populations due to natural selection (Fisher, 1930). This suggests that the sex ratio of sylvatic populations is also close to 1 and that the difference observed in our samples may illustrate a specific reproductive strategy, in which mainly females seek new habitats so that their offspring have a greater chance of survival and reproductive success (Forattini et al. , 1975; Gajate et al.…”

Section: Discussionmentioning

confidence: 55%

Influence of the landscape on dispersal of sylvatic triatomines to anthropic habitats in the Atlantic Forest

Leite¹,

Santos

Falqueto

2010

Journal of Biogeography

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Aim The aim of this study was to test the hypothesis that the dispersal of sylvatic triatomines to anthropic habitats is stimulated by degradation of their natural habitat.Location State of Espírito Santo, south-eastern Brazil.Methods We georeferenced records of domiciliary captures of sylvatic triatomines (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) obtained from the database of the entomological surveillance programme of the Brazilian National Health Foundation. We partitioned the study area into 543 equal hexagons and attributed information on the presence/absence of triatomines and climatic, topographic and biological variables to each. Using generalized additive models (GAMs), we defined the determinant variables for triatomine presence/absence and demarcated the potential areas in which they might occur. We then subjected the hexagons with a high probability of triatomine presence to a second analysis, adding information on the number of domiciliary captures of triatomines and landscape indices that measured quantitative and spatial patterns of forest fragments. We used GAMs to determine the indices that influenced the number of domiciliary captures of triatomines. ResultsThe presence of triatomines was characterized by a strong positive correlation with variability of terrain slope. This variable was used to demarcate the areas where triatomines were likely to occur. Landscape indices associated with the number of domiciliary captures of triatomines were the number of patches, the fractal dimension index, the total core area and the clumpiness index. Main conclusionsOur results do not support the hypothesis that domiciliary invasion by sylvatic triatomines is stimulated by environmental degradation. Instead, the results suggest that less degraded areas maintain larger populations of triatomines and consequently present higher indices of dispersal and domiciliary invasion. Particular landscape patterns and dispositions of human dwellings, however, may enhance the probability of triatomines being attracted to the artificial light of dwellings. Initiation of flight and consequent dispersal is a naturally occurring process that allows triatomines to find and colonize areas that favour the survival of their offspring.

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Section: Discussionmentioning

confidence: 55%

Influence of the landscape on dispersal of sylvatic triatomines to anthropic habitats in the Atlantic Forest

Leite¹,

Santos

Falqueto

2010

Journal of Biogeography

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“…It occurs in Bolivia, Paraguay, Argentina and Uruguay [ 2 ], and Brazilian Cerrado [ 1 ]. This vector has broad ecological valence, and so it can live in several ecotopes and use different food sources [ 3 ]. It shows high rates of active dispersal [ 4 ], and it can also be passively introduced into artificial environments, possibly in firewood piles transported from forests to households, or from one household to another [ 5 ], or attached to bird feathers [ 3 ].…”

Section: Resultsmentioning

confidence: 99%

Markers for the population genetics studies of Triatoma sordida (Hemiptera: Reduviidae)

Belisário¹,

Pessoa²,

Santos³

et al. 2015

Parasites Vectors

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BackgroundTriatoma sordida, a vector of Trypanosoma cruzi, is native of Brazil, Bolivia, Paraguay, Argentina, and Uruguay, and occurs primarily in peridomiciles. Currently, it is the species most frequently captured by the Chagas Disease Control Program in Brazil. For this reason, population genetic studies attract great interest, as they can provide further information about the dispersal and household invasion processes of this species. In the absence of suitable markers, the objective of this study was to test the cross amplification of microsatellite primers.Findings23 primers were tested for microsatellite loci already described for other species of the genus Triatoma sp. Forty four specimens of T. sordida captured in the north of Minas Gerais were used to validate the use of standardized loci for population genetic analyses. It was possible to amplify 10 of the 23 loci tested for T. sordida.ConclusionsThis is the first study that provides 10 microsatellite markers for population analysis of this triatomine species. Cross-amplification of primers can be used among other phylogenetically related species whose loci are already available for study.

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“…9,10 Triatoma sordida is an endemic species in South America, distributed in Brazil, Bolivia, Paraguay, and Uruguay. 6,8 Because of the high dissemination capacity of T. sordida, 11 which inhabits sylvatic, peridomestic, and domestic environments, 10,12 and presents several food sources, [13][14][15][16][17][18] this species has an appraisable ecological value. 19 Broadly, infection rates by T. cruzi are relatively low, ranging from 0.5% to 16.2%.…”

Section: Introductionmentioning

confidence: 99%

Intraspecific and Interspecific Phenotypic Differences Confirm the Absence of Cryptic Speciation in Triatoma sordida (Hemiptera, Triatominae)

Garcia

Oliveira

Cristal

et al. 2021

The American Journal of Tropical Medicine and Hygiene

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Triatoma sordida is an endemic Chagas disease vector in South America, distributed in Brazil, Bolivia, Paraguay, and Uruguay. Chromosomal, molecular, isoenzimatic, and cuticular hydrocarbon pattern studies indicate cryptic speciation in T. sordida. Recently, T. rosai was described from specimens from Argentina initially characterized as T. sordida. Although several authors assume that the speciation process that supports this differentiation in T. sordida is the result of cryptic speciation, further morphological and/or morphometric studies are necessary to prove the application of this evolutionary event, because the only morphological intraspecific comparison performed in T. sordida is based on geometric morphometry and the only interspecific comparison made is between T. rosai and T. sordida from Brazil that evaluated morphological and morphometric differences. Based on this, morphological analyses of thorax and abdomen using Scanning Electron Microscopy and morphometric analyses of the head, thorax, and abdomen among T. sordida from Brazil, Bolivia, and Paraguay, as well as T. rosai, were performed to assess whether the evolutionary process responsible for variations is the cryptic speciation phenomenon. Morphological differences in the thorax and female external genitalia, as well as morphometric differences in the head, thorax, abdomen, pronotum, and scutellum structures, were observed. Based on this, the evolutionary process that supports, so far, these divergences observed for T. sordida populations/T. sordida subcomplex is not cryptic speciation. Moreover, we draw attention to the necessity for morphological/morphometric studies to correctly apply the cryptic species/speciation terms in triatomines.

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Aspectos ecológicos da tripanossomíase americana: VII. Permanência e mobilidade do Triatoma sordida em relação aos ecótopos artificiais

Cited by 22 publications

References 2 publications

Influence of the landscape on dispersal of sylvatic triatomines to anthropic habitats in the Atlantic Forest

Influence of the landscape on dispersal of sylvatic triatomines to anthropic habitats in the Atlantic Forest

Markers for the population genetics studies of Triatoma sordida (Hemiptera: Reduviidae)

Intraspecific and Interspecific Phenotypic Differences Confirm the Absence of Cryptic Speciation in Triatoma sordida (Hemiptera, Triatominae)

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