Ecological characteristics of Triatoma patagonica at the Southern limit of its distribution (Chubut, Argentina)

Wisnivesky‐Colli, Cristina; Vezzani, Darío; Pietrokovsky, Silvia; Scurti, Hugo; Iriarte, Jorge

doi:10.1590/s0074-02762003000800018

Cited by 11 publications

(6 citation statements)

References 12 publications

(15 reference statements)

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“…Even for T. patagonica , which recovered from chill‐coma in a shorter time, minimum temperatures for the coldest month close to 0 °C are very common according to its distribution model (Figure S4 of File S1). Both, domiciliated and sylvatic populations of these subtropical vectors show a seasonal variation in population size, with few records in winters associated with the low temperatures (Gorla & Schofield, ; Wisnivesky‐Colli et al ., ). By contrast, tropical vectors, including T. dimidiata , show seasonal variation related to the wet season (Dumonteil et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Ecological and physiological thermal niches to understand distribution of Chagas disease vectors in Latin America

Vega

Schilman

2017

Medical Vet Entomology

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Abstract. In order to assess how triatomines (Hemiptera, Reduviidae), Chagas disease vectors, are distributed through Latin America, we analysed the relationship between the ecological niche and the limits of the physiological thermal niche in seven species of triatomines. We combined two methodological approaches: species distribution models, and physiological tolerances. First, we modelled the ecological niche and identified the most important abiotic factor for their distribution. Then, thermal tolerance limits were analysed by measuring maximum and minimum critical temperatures, upper lethal temperature, and 'chill-coma recovery time'. Finally, we used phylogenetic independent contrasts to analyse the link between limiting factors and the thermal tolerance range for the assessment of ecological hypotheses that provide a different outlook for the geo-epidemiology of Chagas disease. In triatomines, thermo-tolerance range increases with increasing latitude mainly due to better cold tolerances, suggesting an effect of thermal selection. In turn, physiological analyses show that species reaching southernmost areas have a higher thermo-tolerance than those with tropical distributions, denoting that thermo-tolerance is limiting the southern distribution. Understanding the latitudinal range along its physiological limits of disease vectors may prove useful to test ecological hypotheses and improve strategies and efficiency of vector control at the local and regional levels.

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Section: Discussionmentioning

confidence: 97%

Ecological and physiological thermal niches to understand distribution of Chagas disease vectors in Latin America

Vega

Schilman

2017

Medical Vet Entomology

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“…Triatoma patagonica is a peridomestic vector of Chagas disease that has been found colonizing domiciles and most commonly peridomiciliary structures in different Argentine provinces (Lent and Wigodzinsky 1979, Ferrero et al 1999, Wisnivesky‐Colli et al 2003, Giraldez et al 2009). Several factors define the competence of a triatomine as a vector of Chagas disease, such as reproductive characteristics and the relationship with feeding‐related patterns.…”

Section: Introductionmentioning

confidence: 99%

“…This species is in the process of adapting to human dwellings in accordance with their biological characteristics, including life cycle, reproduction and antennal phenotype (Rodríguez 2011 1 , Rodríguez et al 2013). It is also adapting to a wide geographic range where this species has been reported colonizing the peridomiciliary structures in Argentina (Lent and Wigodzinsky 1979, Virla de Arguello 1984, Ferrero et al 1999, Wisnivesky‐Colli 2003). We specifically evaluated whether the blood meal source influences: 1) the use of food resources and the conversion of ingested blood into body components in the last nymphal instar and female adult, 2) the amount of blood ingested and its relationship with fecundity, and 3) reproductive parameters and life span in females.…”

Section: Introductionmentioning

confidence: 99%

Effects of blood meal source on food resource use and reproduction inTriatoma patagonicaDel Ponte (Hemiptera, Reduviidae)

Nattero

Rodríguez

Crocco

2013

Journal of Vector Ecology

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Triatoma patagonica (Del Ponte, 1929) (Hemiptera-Reduviidae) is a peridomestic vector of Chagas disease that has been frequently found colonizing peridomestic structures in several localities in Argentina. Studying relationships between feeding and reproductive factors is important because these traits regulate population density and define vectorial capacity. Since T. patagonica can circulate among peridomestic structures taking blood from both bird and mammal hosts, we evaluated the extent to which different blood meal sources affect food resource use and reproductive parameters. We used 5 th instar nymphs and females that fed on either guinea pigs or pigeons to estimate food resource use. We estimated reproductive parameters in adults that fed on these sources. Nymphs and adults showed differences in blood consumption between feeding sources. Females fed on pigeons ingested more blood and needed a higher amount of blood to produce an egg than females fed on guinea pigs. There were no differences in the number of eggs laid and hatched between insects fed on different feeding sources. The higher amount of blood ingested and consumed by T. patagonica fed on pigeons did not translate into higher fecundity or fertility. The lower amount of guinea pig blood ingested was offset by its high nutritional quality. Journal of Vector Ecology 38 (1): 127-133. 2013.

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“…Small numbers of triatomines have been found in Chubut 21 but all tested negative for T cruzi whilst infections have been reported in the seven northern regions of Chile but not in the south 22 . Maps from the Pan American Health Organisation (PAHO) and the International Association for Medical Assistance to Travellers (IAMAT) provide clear advice for no risk of vector-related T. cruzi transmission south of these regions (https://www.iamat.org/risks/chagas-disease, http://www.paho.org/salud-en-las-americas-2012).…”

Section: Methodsmentioning

confidence: 99%

The contemporary distribution of Trypanosoma cruzi infection in humans, alternative hosts and vectors

et al. 2017

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Chagas is a potentially fatal chronic disease affecting large numbers of people across the Americas and exported throughout the world through human population movement. It is caused by the Trypanosoma cruzi parasite, which is transmitted by triatomine vectors to humans and a wide range of alternative host species. The database described here was compiled to allow the risk of vectorial transmission to humans to be mapped using geospatial models. The database collates all available records, published since 2003, for prevalence and occurrence of infection in humans, vectors and alternative hosts, and links each record to a defined time and location. A total of 16,802 records of infection have been extracted from the published literature and unpublished sources. The resulting database can be used to improve our understanding of the geographic variation in vector infection prevalence and to estimate the risk of vectorial transmission of T. cruzi to humans.

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Ecological characteristics of Triatoma patagonica at the Southern limit of its distribution (Chubut, Argentina)

Cited by 11 publications

References 12 publications

Ecological and physiological thermal niches to understand distribution of Chagas disease vectors in Latin America

Ecological and physiological thermal niches to understand distribution of Chagas disease vectors in Latin America

Effects of blood meal source on food resource use and reproduction inTriatoma patagonicaDel Ponte (Hemiptera, Reduviidae)

The contemporary distribution of Trypanosoma cruzi infection in humans, alternative hosts and vectors

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