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POSSIBLE DUAL COLD-HARDINESS STRATEGIES IN CISSEPS FULVICOLLIS (LEPIDOPTERA: ARCTIIDAE)1

Published online by Cambridge University Press:  31 May 2012

Paul G. Fields  and
Jeremy N. McNeil
Paul G. Fields
Affiliation:
Département de biologie, Université Laval, Québec, Québec, Canada G1K 7P4
Jeremy N. McNeil
Affiliation:
Département de biologie, Université Laval, Québec, Québec, Canada G1K 7P4
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Extract

Insects are usually classified as either freeze-intolerant or freeze-tolerant (Danks 1978; Sømme 1982; Baust and Rojas 1985). Freeze-intolerant species cannot survive the formation of ice in their bodies and typically lower their supercooling points (SCP), the temperature of spontaneous ice formation, during the winter months (Sømme 1982). This is the lower lethal temperature for the insect, although prolonged exposure to temperatures above this may be harmful (Turnock et al. 1983). On the other hand, freeze-tolerant insects can survive the presence of ice crystals in their extracellular fluid and usually have nucleators that prevent supercooling below – 10°C (Zachariassen 1982).

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 12 , December 1986 , pp. 1309 - 1311
Copyright
Copyright © Entomological Society of Canada 1986

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