Dynamics of evolution and resistance to starvation of Triatoma vitticeps (Stal 1859) (Reduviidae: Triatominae), submitted to two different regimens of food deprivation

Moreira, Carlos José de Carvalho; Spata, Maria Celeste Dias

doi:10.1590/s0074-02762002000700020

Cited by 10 publications

(10 citation statements)

References 16 publications

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“…These observations, however, contrast with those of laboratory colonies of this species, in which the sex ratio is always close to 1 (Gonçalves et al. , 1988, 1989; Moreira & Spata, 2002). Fisher’s sexual allocation theory predicts that a balanced sex ratio will nearly always evolve in stable populations due to natural selection (Fisher, 1930).…”

Section: Discussioncontrasting

confidence: 91%

“…The sex ratio of the triatomines collected (0.36 M:F) was similar to that observed in sylvatic populations of T. vitticeps collected in anthropic habitats of Rio de Janeiro (0.53 M:F) (Gonçalves et al, 1998). These observations, however, contrast with those of laboratory colonies of this species, in which the sex ratio is always close to 1 (Gonçalves et al, 1988(Gonçalves et al, , 1989Moreira & Spata, 2002). Fisher's sexual allocation theory predicts that a balanced sex ratio will nearly always evolve in stable populations due to natural selection (Fisher, 1930).…”

Section: Discussionsupporting

confidence: 77%

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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: Discussioncontrasting

confidence: 91%

Section: Discussionsupporting

confidence: 77%

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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“…Long survival times have been reported for experimentally breeding nymphs (several months) and adults (around 1 year), with great variations depending on the species. Interestingly, in the case of Triatoma vitticeps , Moreira and Spata [28] reported a surprising increase in survival of the different stages after only one blood meal [28]. In this work, marking the insects gave the first indications of longevity of nymphs and adults in natural conditions.…”

Section: Discussionmentioning

confidence: 57%

Variations in time and space of an Andean wild population of T. infestans at a microgeographic scale

et al. 2014

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BackgroundWild populations of Triatoma infestans are now believed to be the source of reinfestation of dwellings in some Andean areas and could impede the full achievement of vector control campaigns in this region. Given the poor knowledge of these populations in natural conditions, their basic biology traits, such as monthly demographic variations and movements of individuals, were explored.MethodsA previously identified wild population of T. infestans in a field adjacent to a group of isolated houses in an Andean valley (department of La Paz, Bolivia) was explored using regular capture assays over 13 months in 50 sites selected at the beginning of the study. The capture-mark-recapture method was applied monthly using mouse-baited adhesive traps for captures and fingernail polish of different colors for the marking.ResultsThe monthly capture assays did not show significant differences between rainy and dry seasons, showing evidence for a certain stability of the wild T. infestans population with only the nymph population tending to decline during the middle of the rainy season when rain is more intensive. Throughout the study, the monthly average number of bugs was 51.1 ± 25.3 per assay, 91.1% were nymphs, and they were found at 30 of the 50 sites (60%). The number of times a site was positive varied from one to 13. Site infestation was associated with the underground position of the traps, and rocks around and in the surroundings of the traps. The recaptures after marking were successful (138 recaptures over the study). The marking made it possible to detect for 14.5% of the recaptures significant movements of adults (up to 168 m) and nymphs (up to 34 m). Some bugs (nymphs and females) were recaptured after 5 months. For adults, recaptures (46 in total) mostly occurred between September and March. Females were recaptured twice as frequently as males.ConclusionThe Andean wild populations of T. infestans showed a strong spatial and temporal stability during the year-long study. Dispersal may occur mainly during the rainy season. The capture-mark-recapture method was successful and the longevity of the bugs and the distances covered by nymphs and adults were recorded.

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“…, Triatoma vitticeps (8) 36 and Triatoma brasiliensis (11) 39 but lower than the value reported for T. pseudomaculata (14.7) 28 . However, differences in the experimental conditions used by the various authors must be considered.…”

mentioning

confidence: 62%

“…Resistance to fasting could be of great importance and might directly affect control campaigns targeting these vectors 11 . Tolerance to long periods of fasting helps these…”

Section: Introductionmentioning

confidence: 99%

Biology of Triatoma carcavalloi Jurberg, Rocha & Lent, 1998 under laboratory conditions

Cardozo-de-Almeida

Neves

Almeida

et al. 2014

Rev. Soc. Bras. Med. Trop.

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Introduction:Triatoma carcavalloi is a wild species that is found in sympatry with Triatoma rubrovaria and Triatoma circummaculata, which are vectors of Trypanosoma cruzi currently found in rural areas of Rio Grande do Sul, Brazil. Methods: Fertility was assessed and to determine the incubation period, the eggs were observed until hatching. The first meal was offered to 1 st stage nymphs. The intermolt period was also determined. The number of blood meals was quantified at each nymphal stage and the resistance to fasting as the period between ecdysis and death. Mortality was assessed and longevity was determined by recording the time that elapsed from molting to the adult stage and until death. The developmental cycle was assessed by recording the length in days of each stage from molting to adult hood. Results: The average incubation period was 22.7 days. The average first meal occurred 3.1 days after hatching. The 5 th stage nymph to adult intermolting period was the longest at 193.4 days. The average number of feedings during nymphal development was 13.4. The resistance to fasting assay indicated that the 3 rd , 4 th and 5 th stage nymphs presented higher resistance than did adults. The highest mortality rate was observed in the 3 rd stage nymphs (22.2%). The average length of adult survival was 25.6 weeks, and the average total life cycle lasted 503.4 days. Conclusions:This study is the first report on the biology of T. carcavalloi that fed on mice. The presented findings expand the bionomic knowledge of these species.

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Dynamics of evolution and resistance to starvation of Triatoma vitticeps (Stal 1859) (Reduviidae: Triatominae), submitted to two different regimens of food deprivation

Cited by 10 publications

References 16 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

Variations in time and space of an Andean wild population of T. infestans at a microgeographic scale

Biology of Triatoma carcavalloi Jurberg, Rocha & Lent, 1998 under laboratory conditions

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