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OVERWINTER SURVIVAL OF SPEAR-MARKED BLACK MOTH, RHEUMAPTERA HASTATA (LEPIDOPTERA: GEOMETRIDAE), PUPAE IN INTERIOR ALASKA

Published online by Cambridge University Press:  31 May 2012

Richard A. Werner
Richard A. Werner
Affiliation:
Institute of Northern Forestry, Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Fairbanks, Alaska 99701
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Abstract

Snow depth is the most important environmental factor in the survival of overwintering Rheumaptera hastata (L.) pupae in interior Alaska. Pupae spend the winter in the leaf litter where litter temperatures are directly related to snow depth at given air temperatures. Winter survival is also dependent on the cessation of pupal development (diapause) and the development of cold-hardiness which is induced by certain physiological processes such as supercooling and changes in glycerol and carbohydrate levels. Glycerol content and supercooling are dependent on changes in carbohydrate levels which in turn are directly related to changes in the rate of pupal development prior to diapause.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 8 , 01 August 1978 , pp. 877 - 882
Copyright
Copyright © Entomological Society of Canada 1978

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