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Effect of sequential cold shocks on survival and molting rate in Triatoma infestans Klug
Campos, Silvana G. P; Rodrigues, Vera Lúcia C. C; Wada, C. Y; Mello, Maria Luiza S.
  • Campos, Silvana G. P; Universidade Estadual de Campinas. Instituto de Biologia. Departamento de Biologia Celular. Campinas. BR
  • Rodrigues, Vera Lúcia C. C; Sucen. Mogi-Guaçu. BR
  • Wada, C. Y; Universidade Estadual de Campinas. Instituto de Matemática, Estatística e Computaçäo Científica. Departamento de Estatística. Campinas. BR
  • Mello, Maria Luiza S; Universidade Estadual de Campinas. Instituto de Biologia. Departamento de Biologia Celular. Campinas. BR
Mem. Inst. Oswaldo Cruz ; 97(4): 579-582, June 2002. tab
Article in English | LILACS, SES-SP | ID: lil-314525
RESUMO
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
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Triatoma / Cold Temperature / Molting Limits: Animals Language: English Journal: Mem. Inst. Oswaldo Cruz Journal subject: Tropical Medicine / Parasitology Year: 2002 Type: Article Affiliation country: Brazil Institution/Affiliation country: Sucen/BR / Universidade Estadual de Campinas/BR

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Full text: Available Index: LILACS (Americas) Main subject: Triatoma / Cold Temperature / Molting Limits: Animals Language: English Journal: Mem. Inst. Oswaldo Cruz Journal subject: Tropical Medicine / Parasitology Year: 2002 Type: Article Affiliation country: Brazil Institution/Affiliation country: Sucen/BR / Universidade Estadual de Campinas/BR