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THE ARRIVAL SEQUENCE OF THE ARTHROPOD COMPLEX FOLLOWING ATTACK BY DENDROCTONUS BREVICOMIS (COLEOPTERA: SCOLYTIDAE) IN PONDEROSA PINE1

Published online by Cambridge University Press:  31 May 2012

Frederick M. Stephen  and
Donald L. Dahlsten
Frederick M. Stephen
Affiliation:
Division of Biological Control, Department of Entomological Sciences, University of California, Berkeley
Donald L. Dahlsten
Affiliation:
Division of Biological Control, Department of Entomological Sciences, University of California, Berkeley
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Abstract

Continuous trapping on the bark surface of Dendroctonus brevicomis LeConte infested trees in the central Sierra Nevada mountains was undertaken with the objective of determining the spatial and temporal arrival patterns of the natural enemies and other insect associates of the western pine beetle. Over 100 species of D. brevicomis associates were collected and patterns of arrival were described for many of these. The main bark beetle predators were trapped during D. brevicomis mass arrival and shortly thereafter. Enoclerus lecontei, Temnochila chlorodia, and Aulonium longum, all predaceous beetles on D. brevicomis adults and larvae, were among the first species to arrive, as was Medetera aldrichii (Diptera), a larval predator. The bark beetle parasites Roptrocerus xylophagorum and Dinotiscus (=Cecidostiba) burkei (Hymenoptera) were well synchronized with the beetles’ life cycle as they arrived late in the beetles’ larval stages when suitable hosts were available.

Approximately twice as many associates were trapped in the first (spring) beetle generation as in the second (fall). Differences between species with regard to height distribution were common, and these often varied with seasonal beetle generation.

Calculations of changes in species diversity through time, of the associate complex trapped at the bark surface, were made for both the first and second beetle generation. Linear correlation analysis indicated a highly significant increase in species diversity occurred from the time of the beetles’ mass arrival until brood emergence. This increase may correspond to an increase in diversity of the structure of the subcortical community, as more insect species arrived and progressively modified the habitat of the newly killed tree.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 3 , March 1976 , pp. 283 - 304
Copyright
Copyright © Entomological Society of Canada 1976

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