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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/23866

Title: Effect of Sequential Cold Shocks on Survival and Molting Rate in Triatoma infestans Klug
Authors: Campos, Silvana G. P.
Rodrigues, Vera Lúcia Cortiço Corrêa
Wada, C. Y.
Mello, Maria Luiza S.
Keywords: Triatoma infestans   - nutritional conditions - cold-shock tolerance - survival - molting rate
Issue Date: 31-Dec-2002
Publisher: Fundação Oswaldo Cruz, Fiocruz
Citation: Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 97 Num 4
Abstract: The survival and molting incidence in Triatoma infestans   , 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.
URI: http://hdl.handle.net/1807/23866
Other Identifiers: http://www.bioline.org.br/abstract?id=oc02110
Rights: Copyright 2002 - Instituto Oswaldo Cruz - Fiocruz
Appears in Collections:Bioline International Legacy Collection

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