Survival and Molting Incidence after Heat and Cold Shocks in Panstrongylus megistus Burmeister

Abstract

Survival and molting incidence were studied after heat (40°C) and cold (0°C) shocks in specimens of

Changes in nuclear phenotype frequencies following sequential cold shocks in Triatoma infestans (Hemiptera, Reduviidae)

“…HD was not a significant surviving strategy following cold shocks. Indeed, HD is not required for cell survival following cold shocks in T. infestans, in contrast to Panstrongylus megistus, a reduviid species which is more sensitive to cold shock and acquires cold-shock tolerance following sequential cold shocks (Garcia et al 1999(Garcia et al , 2000a.…”

Changes in nuclear phenotypes following cold shock in Panstrongylus megistus (Burmeister)

“…Exposure for l h at 0°C affects the survival of P. megistus nymphs at various developmental stages and adults, more than does a heat shock at 40°C for the same time, although this difference is relatively less pronounced in 5th instar nymphs (Garcia et al 1999b). Cold shock also drastically affects the frequency and time of molting, to a greater extent than does heat shock (Garcia et al 1999b).…”

“…Variations in the responses are a function of the shock duration and of the insect developmental phase, sex and species (Rodrigues et al 1991, Dantas & Mello 1992, Garcia et al 1999b. Panstrongylus megistus, for instance, is less resistant than Triatoma infestans to heat and cold shock assays (Rodrigues et al 1991, Garcia et al 1999b.…”

“…Variations in the responses are a function of the shock duration and of the insect developmental phase, sex and species (Rodrigues et al 1991, Dantas & Mello 1992, Garcia et al 1999b. Panstrongylus megistus, for instance, is less resistant than Triatoma infestans to heat and cold shock assays (Rodrigues et al 1991, Garcia et al 1999b. P. megistus is a very important disease vector because of its wide distribution in Brazil, its high rate of infection with Trypanosoma cruzi and its adaptability in invadThis paper received financial support from the State of São Paulo Research Foundation (Fapesp, grants no.…”

“…Cold shock also drastically affects the frequency and time of molting, to a greater extent than does heat shock (Garcia et al 1999b). Even so, more than 50% of the P. megistus nymphs at different developmental phases survive for at least one month after a short cold shock (Garcia et al 1999b).…”