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

Memórias do Instituto Oswaldo Cruz

Silvana Gp Campos²  Vera Lúcia Cc Rodrigues¹  Cy Wada¹  Maria Luiza S Mello² 

[1] ,Universidade Estadual de Campinas Instituto de Biologia Departamento de Biologia Celular

关键词: Triatoma infestans;    nutritional conditions;    cold-shock tolerance;    survival;    molting rate;   

DOI  :  10.1590/S0074-02762002000400024

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License