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The heat resistance of calliphoridae larvae and its dependence on development and breeding temperature

The heat resistance of calliphoridae larvae and its dependence on development and breeding temperature

Journal of Insect Physiology 22(7): 907-912

Five stages of larvae of Callitroga macellaria, Lucilia cuprina and Calliphora vicina were examined for heat resistance. The 3 spp. show differences as far as temperature adaptation and acclimatization are concerned. The heat coma point of the larvae and the ability to pupate and to emerge after heating were investigated. Differences in adaptation or acclimatization of the 3 spp. are reflected by the differences in heat resistance: Callitroga is the most resistant, followed by Lucilia and Calliphora. During development the heat resistance of the larvae of the 3 spp. increased. With stage IV of Callitroga and Calliphora and stage V of Lucilia heat tolerance decreased. The results of testing different instars of the larvae require that a distinction be made not only between feeding and non-feeding larvae but also within the 2 groups. Generally ED50 (heat coma) is higher than ED50 (pupation) and this is higher than ED50 (emergence). Exceptions were observed especially with Calliphora, which is very sensitive to heat. There is an inverse relation between the rate of metabolism and heat resistance. The sensibility of non-feeding larvae (stage V) probably depends on the different effective acclimatization of the feeding and non-feeding larvae. Heat resistance probably depends particularly upon oxidative phosphorylation.

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