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COMPARISON OF FLIGHT AGGREGATION IN TWO SPECIES OF SOUTHERN IPS (COLEOPTERA: SCOLYTIDAE)1

Published online by Cambridge University Press:  31 May 2012

Richard R. Mason
Richard R. Mason
Affiliation:
Forest Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, Corvallis, Oregon
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Abstract

Comparisons were made of frequency distributions of Ips avulsus (Eichh.) and Ips grandicollis (Eichh.) caught in window traps while these species were attacking fresh pine slash. Relationships between mean and variance of trap data indicated that the flight of I. avulsus was more highly aggregated than the flight of I. grandicollis. Three different indices of aggregation were calculated which quantitatively expressed the degree of flight aggregation in each species. Degree of aggregation during attack may be an index of aggressiveness since it determines beetle density which influences attack success on a living host. The relatively high degree of flight aggregation of I. avulsus may partly explain why this species is more frequently a killer of live trees than is I. grandicollis.

Type
Articles
Information
The Canadian Entomologist , Volume 102 , Issue 8 , August 1970 , pp. 1036 - 1041
Copyright
Copyright © Entomological Society of Canada 1970

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