Aggregation Behaviour and Interspecific Responses in Three Species of Triatominae

Figueiras, Alicia Nieves Lorenzo; Lazzari, Claudio R.

doi:10.1590/s0074-02761998000100025

Cited by 44 publications

(22 citation statements)

References 17 publications

(16 reference statements)

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“…This work represents the first detailed analysis of aggregation and geotaxis in adult males and females of T. infestans , and how both sexes are affected by T. cruzi infection. As shown before in nymphal instars 43,44 , adults exhibited an active aggregation due to the inter-attraction between individuals, illustrating the social character of these insects. A stable aggregation emerged for both sexes, but the fraction of aggregated individuals and the density of the clusters were higher for males than for females.…”

Section: Discussionsupporting

confidence: 77%

Alteration of the social and spatial organization of the vector of Chagas disease,Triatoma infestans, by the parasiteTrypanosoma cruzi

Depickère

Ramírez-Ávila

Deneubourg

2018

Preprint

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Insects of Triatominae subfamily are vectors of the parasite Trypanosoma cruzi, the etiological agent of Chagas disease affecting millions of people in Latin America. Some of these vector species, like Triatoma infestans, live in the human neighborhood, aggregating in walls or roof cracks during the day and going out to feed on animal or human blood at night. Except for their feeding specialization, these insects share this cycle of activities with many gregarious arthropod species. The understanding of how sex and T. cruzi infection affect their aggregation and geotaxis behavior is essential for understanding the spatial organization of the insects and the parasite dispersion. Experiments with non-infected and infected adults of T. infestans show that the insects presented a high negative geotaxis and aggregative behavior. Males had a higher negative geotaxis and a higher aggregation level than females. The aggregation level and the negative geotaxis were stronger in infected insects than in non-infected ones, the difference between sexes being maintained. The importance of these results is discussed in term of parasitic manipulation, dispersion of the vector and strategy of its monitoring.

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Section: Discussionsupporting

confidence: 77%

Alteration of the social and spatial organization of the vector of Chagas disease,Triatoma infestans, by the parasiteTrypanosoma cruzi

Depickère

Ramírez-Ávila

Deneubourg

2018

Preprint

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“…Following the strong reduction in abundance of T. infestans in this area, T. garciabesi and T. guasayana were found concurrently in only nine of > 2300 site searches (< 0.4%) during five surveys (mean 460 sites/survey). This lack of association is surprising because T. sordida nymphs (probably T. garciabesi given the origin of the specimens) showed an aggregative response to T. guasayana faeces in experimental assays, but not vice versa (Lorenzo Figueiras & Lazzari, 1998). Other triatomine species have been collected concurrently from the same sites (Zeledón & Rabinovich, 1981), but their frequency of association was not tested for significance.…”

Section: Discussionmentioning

confidence: 99%

Peridomestic distribution of Triatoma garciabesi and Triatoma guasayana in north‐west Argentina

Canale¹,

Cecere

Chuit

et al. 2000

Medical Vet Entomology

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The Reduviid bugs Triatoma garciabesi Carcavallo et al. (Hemiptera: Reduviidae: Triatominae), previously known as T. sordida Ståhl in the semi-arid chaco region, and T. guasayana Wygodzinsky & Abalos, vectors of Trypanosoma cruzi Chagas (Kinetoplastida: Trypanosomatidae), were found to occupy wide but different ranges of ecotopes in the peridomestic environment. At Amamá and nearby rural villages in north-western Argentina, a combined total of 1233 specimens were collected from 325/2314 (14%) sites surveyed at 6-monthly intervals from November 1994 to November 1996. Triatoma garciabesi and T. guasayana displayed a significantly different distribution among peridomestic ecotopes. Triatoma garciabesi predominated over T. guasayana in the prevalence of infested sites, the number of colonies and the number of bugs collected. For T. garciabesi, the predominant ecotopes most likely to yield T. garciabesi repeatedly were the rugged bark of Prosopis alba or P. nigra (Fabaceae) trees, where chickens roosted, and chicken coops. For T. guasayana the main ecotopes were goat or sheep corrals, piled materials and orchard fences. Triatoma garciabesi and T. guasayana were collected concurrently from the same site on 9/2314 (0.4%) occasions, and on different dates at the same site on 12 (0.5%) occasions. The observed low frequency of mixed populations (< 1%) was not significantly different from that expected from a hypothesis of independence. Triatoma garciabesi clearly outnumbered T. guasayana in four of the nine mixed populations, none of which persisted as such. Neither T. garciabesi nor T. guasayana colonized human habitations, even in the absence of T. infestans (formerly the predominant domestic vector of T. cruzi in this area), a situation that apparently has not changed in the last 50 years in northern Argentina.

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“…Triatomines use different physical and chemical cues to orient towards host refuges (Lazzari & Lorenzo, ). Many triatomine species are attracted to and aggregate around conspecific as well as heterospecific faeces in laboratory experiments, highlighting the effect of dry faeces on the attraction and aggregation of nymphs and adults (Schofield & Patterson, ; Cruz‐López et al ., ; Lorenzo Figueiras et al ., ; Lorenzo & Lazzari, ; Lorenzo Figueiras & Lazzari, ; Pires et al ., ; Vitta et al ., , ). Although volatile composition may shift over time (Lorenzo Figueiras & Lazzari, ; Mota et al ., ), fresh faeces are reported to have a repellent effect on triatomine bugs (Lorenzo Figueiras et al ., ).…”

Section: Introductionmentioning

confidence: 98%

Behavioural and electrophysiological responses of Triatoma dimidiata nymphs to conspecific faecal volatiles

Galvez-Marroquin

Cruz‐López

Malo

et al. 2017

Medical Vet Entomology

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Abstract. The behavioural and electrophysiological (electroantennography) responses of the first two instars of Triatoma dimidiata (Hemiptera: Reduviidae) Latreille to fresh and dry faecal headspace volatile extracts from fifth instar conspecific nymphs and synthetic compounds were analysed in this study. Recently emerged nymphs (3-5 days) aggregated around filter paper impregnated with dry faeces and around filter paper impregnated with extracts from both fresh and dry faeces. Older first instars (10-15 days) and second instars aggregated around filter paper impregnated with fresh and dry faeces, and their respective headspace extracts. Dry faecal volatile extracts elicited the strongest antennal responses, followed by fresh faecal extracts. Gas chromatography−mass spectrometry analysis of dried faecal headspace volatiles demonstrated the presence of 12 compounds: 2-ethyl-1-hexanol, 1,2,4-trimethylbenzene, n-octadecane, n-nonadecane, n-eicosane, n-heneicosane, n-tricosane, n-pentaeicosane, n-hexaeicosane, n-octaeicosane, nonanal, and 4-methyl quinazoline. In fresh faecal headspace extracts, only nonanal was clearly detected, although there were other trace compounds, including several unidentified sesquiterpenes. Four of the 11 compounds tested individually elicited aggregation behaviour at concentrations of 100 ng/μL and 1 μg/μL. A blend containing these four components also mediated the aggregation of nymphs. These volatiles may be valuable for developing monitoring methods and designing sensitive strategies to detect and measure T. dimidiata infestation.

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Aggregation Behaviour and Interspecific Responses in Three Species of Triatominae

Cited by 44 publications

References 17 publications

Alteration of the social and spatial organization of the vector of Chagas disease,Triatoma infestans, by the parasiteTrypanosoma cruzi

Alteration of the social and spatial organization of the vector of Chagas disease,Triatoma infestans, by the parasiteTrypanosoma cruzi

Peridomestic distribution of Triatoma garciabesi and Triatoma guasayana in north‐west Argentina

Behavioural and electrophysiological responses of Triatoma dimidiata nymphs to conspecific faecal volatiles

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