Effect of Sequential Cold Shocks on Survival and Molting Rate in Triatoma infestans Klug

Autor: Silvana GP Campos, Vera Lúcia CC Rodrigues, CY Wada, Maria Luiza S Mello
Jazyk: angličtina
Rok vydání: 2002
Předmět:
Zdroj: Memorias do Instituto Oswaldo Cruz, Vol 97, Iss 4, Pp 579-582 (2002)
Druh dokumentu: article
ISSN: 0074-0276
1678-8060
DOI: 10.1590/S0074-02762002000400024
Popis: The survival and molting incidence in Triatoma infestans, a vector of Chagas disease, were investigated following sequential shocks at 0ºC in fifth instar nymphs under moderate fasting and full nutritional conditions. The shocks were separated by intervals of 8 h and 24 h at 30ºC. The results indicated that in terms of insect survival, T. infestans is tolerant to a single cold shock at 0ºC 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 30ºC. 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.
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