Triatoma infestans check for this species in other resources - nutritional conditions - cold-shock tolerance - survival - molting rate"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 4, 2002, pp. 579-582
Bioline Code: oc02110
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 4, 2002, pp. 579-582

 en Effect of Sequential Cold Shocks on Survival and Molting Rate in Triatoma infestans check for this species in other resources Klug
Silvana GP Campos; Vera Lúcia CC Rodrigues; CY Wada & Maria Luiza S Mello

Abstract

The survival and molting incidence in Triatoma infestans check for this species in other resources , a vector of Chagas disease, were investigated following sequential shocks at 0°C in fifth instar nymphs under moderate fasting and full nutritional conditions. The shocks were separated by intervals of 8 h and 24 h at 30°C. The results indicated that in terms of insect survival, T. infestans is tolerant to a single cold shock at 0°C even for 12 h, or to sequential cold shocks, regardless of the nutritional state of the specimens. In terms of molting rate, fasting enhanced the tolerance to sequential cold shocks, but did not exceed the tolerance acquired by fully-nourished specimens, except when cold shocks were separated by an 8 h interval at 30°C. The protective action elicited by fasting was assumed to be additive to that induced by a single mild cold shock or sequential cold shocks. The cold-tolerance response of T. infestans may have favoured its survival in areas of South America with low temperatures, even considering that this species is predominantly associated with human habitats.

Keywords
Triatoma infestans check for this species in other resources - nutritional conditions - cold-shock tolerance - survival - molting rate

 
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