The Effect of Acclimation Temperature on the Critical Thermal Maximum of a Cold-Water Population of Pteronarcys Dorsata (Say) (Plecoptera: Pteronarcyidae)

Abstract

The critical thermal maximum (CTmax) of Pteronarcys dorsata (Say) acclimated in the laaboratory to 5 different temperatures ranging from 4 to 28 degrees C was 34.7-36.6 degrees C. A 6th temperature (33 degrees C) resulted in 100% mortality during the acclimation period. Although its CTmax values rank P. dorsata as moderately sensitive to thermal stress, the