Lack of Segregation between Two Species of Chagas Disease Vectors

Mota, Theo; Lorenzo, Marcelo G.

doi:10.4269/ajtmh.2012.11-0168

Cited by 11 publications

(10 citation statements)

References 47 publications

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“…For example, some species of Triatominae are attracted to the chemical signals left from individuals of the same and of different species 39 . At the same time, in a binary choice experiment involving one or two species, individuals are not able to aggregate (or segregate) in a particular shelter and display therefore a spatial dispersion (equal distribution of individuals between the two shelters) 40 . Our model accounts for these situations even though the feedbacks retained relate to conspecific and heterospecific attractions.…”

Section: Discussionmentioning

confidence: 99%

Transition between segregation and aggregation: the role of environmental constraints

Nicolis

Halloy

Deneubourg

2016

Sci Rep

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Interactions between sub-groups (species, strains) have been reported in many species among many taxae. We propose a generic model based on earlier experiments accounting for both conspecific (or between individuals of the same strains) and heterospecific (or between strains) interactions. The model predicts different collective behaviours without any change of individuals’ algorithm as some key generic parameters such as the carrying capacity, the number of individuals involved and the strength of inter-attraction between sub-groups are varied. A key result is the possibility for sub-groups to segregate between patches and for transition between different patterns, even in absence of active agonistic behaviour. The model can be viewed as a network of feedbacks that is independent of the signals or cues involved in mixed groups interactions. Its predictions are therefore applicable to a wide spectrum of situations including social insects (inter castes interaction) and provides insights on possible mechanisms that can be at work.

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Section: Discussionmentioning

confidence: 99%

Transition between segregation and aggregation: the role of environmental constraints

Nicolis

Halloy

Deneubourg

2016

Sci Rep

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“…In one of the shelters, a piece of filter paper (4×6 cm) impregnated with a blend of the five compounds was introduced, while the other shelter contained a piece of filter paper treated with solvent as control. This shelter design ( Figure 1B ) is proven to successfully recruit triatomine bugs [6] , [7] , [23] , [24] , which tend to enter the shelters due to their strong thigmotaxis and intense negative phototaxis [25] .…”

Section: Methodsmentioning

confidence: 99%

A Multi-species Bait for Chagas Disease Vectors

et al. 2014

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BackgroundTriatomine bugs are the insect vectors of Trypanosoma cruzi, the etiological agent of Chagas disease. These insects are known to aggregate inside shelters during daylight hours and it has been demonstrated that within shelters, the aggregation is induced by volatiles emitted from bug feces. These signals promote inter-species aggregation among most species studied, but the chemical composition is unknown.Methodology/Principal FindingsIn the present work, feces from larvae of the three species were obtained and volatile compounds were identified by solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). We identified five compounds, all present in feces of all of the three species: Triatoma infestans, Panstrongylus megistus and Triatoma brasiliensis. These substances were tested for attractivity and ability to recruit insects into shelters. Behaviorally active doses of the five substances were obtained for all three triatomine species. The bugs were significantly attracted to shelters baited with blends of 160 ng or 1.6 µg of each substance.Conclusions/SignificanceCommon compounds were found in the feces of vectors of Chagas disease that actively recruited insects into shelters, which suggests that this blend of compounds could be used for the development of baits for early detection of reinfestation with triatomine bugs.

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“…The occurrence of competitive processes in triatomines has been studied through the analysis of interactions between different species in laboratory conditions (Mota & Lorenzo, ), semi‐natural environments (Bar et al ., ; Pereira et al ., ; Oscherov et al ., , ) and in the context of natural colonization and recolonization processes in domestic and peridomestic environments (Cecere et al ., ; Pereira et al ., ). Most of these reports analysed changes in the density of a controlled population of a particular species in the presence of a second species and suggested that individuals presenting higher feeding rates would demonstrate adaptive advantages over those that need more time to attain full alimentation when food is limited.…”

Section: Introductionmentioning

confidence: 99%

Differences in competitive ability for the occupancy of shelters in triatomines

Zacharias

Minoli

Manrique

2017

Medical Vet Entomology

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Triatomines (Hemiptera: Reduviidae: Triatominae) are nocturnal blood-sucking insects. During daylight hours they remain in an akinetic state inside their shelters, whereas at dusk they become active and move outside. When they are outside their shelters during the photophase, triatomines are vulnerable to diurnal predators and the period just before dawn is critical to their survival. This work analyses the existence of competitive interactions involved in the occupancy of shelters by triatomines. Behavioural assays were performed in which nymphs of different stages, nutritional status or species were released in an experimental arena containing a space-limited artificial shelter. The proportions of individuals occupying the shelter during the photophase were quantified to estimate the competitive abilities of each stage and species. Intraspecific comparisons showed higher levels of shelter occupancy for fourth over fifth instars and fed over unfed nymphs of Triatoma infestans. Interspecific comparisons showed higher rates of shelter occupancy for Triatoma sordida in comparison with T. infestans, and for T. infestans over Rhodnius prolixus. Arrival order was also relevant to determining shelter occupancy levels: early arrival was advantageous in comparison with later arrival. The study of intra- and interspecific competitive interactions for shelter occupancy provides relevant information about colonization and recolonization processes in the natural environments of triatomines.

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Lack of Segregation between Two Species of Chagas Disease Vectors

Cited by 11 publications

References 47 publications

Transition between segregation and aggregation: the role of environmental constraints

Transition between segregation and aggregation: the role of environmental constraints

A Multi-species Bait for Chagas Disease Vectors

Differences in competitive ability for the occupancy of shelters in triatomines

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