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DEVELOPMENTAL SUCCESS OF TWO SPECIES OF IPS (COLEOPTERA: SCOLYTIDAE) IN A CHRONICALLY IRRADIATED FOREST COMMUNITY1

Published online by Cambridge University Press:  31 May 2012

John H. Brower
John H. Brower
Affiliation:
Biology Department, Brookhaven National Laboratory, Upton, New York and Entomology Department, University of Massachusetts, Amherst
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Abstract

Pinus rigida trees exposed throughout the study to chronic gamma irradiation were inventoried to determine the intensity of attack by the bark beetles Ips grandicollis and I. calligraphus. Beetle developmental success was determined from bark samples by estimating the percentage of the cambial surface utilized. Trees killed by high radiation doses were attacked by the beetles even though radiation exposure proved lethal (> 500 r/day). In dead trees receiving lower doses adults survived but progeny were killed during different stages of development, depending on the dose rate. Developmental success was less on the exposed side of each tree than on the shielded side. Species with short life cycles have a survival advantage over those that have a long life cycle when exposed to chronic irradiation.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 3 , March 1974 , pp. 233 - 238
Copyright
Copyright © Entomological Society of Canada 1974

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