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COLD TOLERANCE IN RELATION TO STARVATION OF ADULT RHYZOPERTHA DOMINICA (COLEOPTERA: BOSTRICHIDAE)

Published online by Cambridge University Press:  31 May 2012

Wayland R. Swain
Wayland R. Swain
Affiliation:
Lake Superior Basin Studies Center, University of Minnesota, Duluth
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Abstract

The tolerance of young adult Rhyzopertha dominica (Fab) to sub-freezing temperatures, −5, −10, −12, −18, −21, and −25 °C, was studied. Mortality in test populations increased in proportion to amplification of both intensity and duration. The increase in mortality with respect to duration follows a sigmoid curve. Environmental stresses, i.e., intense cold and starvation, increase the slope of the curve. In all cases, starvation mitigates against survival. R. dominica dies of starvation in a period between 116 and 432 h. Mortality due to starvation plotted against time yields a sigmoid curve.

Inhibition in feeding was observed in starved populations after 20 min of exposure at −18 °C or lower. This inhibition led to death after 7 days and apparently occurred secondarily to a state of “stress-induced lethargy.” Stress-induced lethargy was observed only in organisms which were both starved and subjected to sub-freezing temperatures.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 10 , October 1975 , pp. 1057 - 1061
Copyright
Copyright © Entomological Society of Canada 1975

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