Abstract
AbstractA study was conducted to examine the relationship between development rate and constant temperatures (14, 21, 24, 27, 33, 36, 40, and 45°C) for the rangeland grasshoppers Melanoplus sanguinipes (F.) and Aulocara elliotti (Thomas). Non-linear regression was used to generate estimates of lower development thresholds. The chosen model provided for a concave-shaped development rate function at temperatures above the lower threshold and required fewer parameters than previous models. Although experimental results suggested that no precise estimates of upper development thresholds could be obtained, previous field studies indicate that preferred body temperatures may be lower than ambient temperatures and probably are related in part to the thermoregulatory abilities of the two species studied. Results will be of interest to insect ecologists and those studying grasshopper biology as well as researchers and pest managers interested in predicting grasshopper development.
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