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Vertical and seasonal variation in canopy arthropod communities in an old-growth conifer forest in southwestern Washington, USA

Published online by Cambridge University Press:  10 July 2009

T.D. Schowalter  and
L.M. Ganio
T.D. Schowalter*
Affiliation:
Department of Entomology, Oregan State University, Corvallis, OR97331-2907, USA
L.M. Ganio
Affiliation:
Department of Forest Science, Oregan State University, Corvallis, OR97331-2907, USA
*
*Fax: 541 737 3643 E-mail: schowalt@bcc.orst.edu
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Abstract

Variation in canopy arthropod abundances and community structure were evaluated in an old-growth (500-year-old) forest at the Wind River Canopy Crane Research Facility in southwestern Washington, USA. Arthropods were sampled at three canopy levels and two seasons in each of four tree species (Pseudotsuga menziesii, Tsuga heterophylla, Abies grandis, and Thuja plicata). The four tree species had distinguishable arthropod species compositions and community organization. Thuja plicata (Cupressaceae) had a particularly distinctive canopy fauna dominated by several mite taxa which did not occur on the other tree species (all Pinaceae). Pseudotsuga menziesii hosted a relatively diverse arthropod fauna with greatest richness of taxa and functional groups. Distinct arthropod assemblages were not observed among canopy levels and sampling dates, but these factors significantly influenced abundances of 63% of the arthropod taxa, either individually or interactively with other factors. These data indicate that forests managed for fewer tree species eliminate important components of arthropod diversity in Pacific Northwest forests and that sampling for biodiversity assessment also should represent season and canopy level.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 88 , Issue 6 , December 1998 , pp. 633 - 640
Copyright
Copyright © Cambridge University Press 1998

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