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29 March 2007 Diversity of the beetle (Coleoptera) community captured at artificially-created snags of Douglas-fir and Grand fir
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Snags are dead standing trees that have been killed by such forces as fire, wind, lightning, insects/disease, drought and/or flooding. Snag management includes such practices as protecting/maintaining existing snags and artificially creating additional snags. Snags can be used by the insect community that occurs on a site. The objective of the current study was to describe and compare the abundance, species composition and diversity of the beetle community captured adjacent to artificially created snags of Douglas-fir, Pseudotsuga menziesii var. glauca Franco, and Grand fir, Abies grandis (Douglas) Lindley. Beetle populations directly adjacent to the artificially created snags were monitored throughout the season using Lindgren-funnel traps placed directly adjacent to snags. A total of 27,428 beetles from 28 families were captured from May through September, 2002. Significantly more beetles were captured adjacent to the Douglas-fir snags than the Grand fir snags. Beetle capture was highest in late May and lowest in early August. Family richness of the captured beetle community was similar at traps adjacent to the Douglas-fir and Grand fir snags but family diversity was lower at traps adjacent to the Douglas-fir snags. A single species, Hylastes nigrinus (Mannerheim) (Curculionidae: Scolytinae), dominated the early capture peak. Ten genera of scolytids and at least 14 species were captured. An additional 10 genera (16 species) of other curculionids were captured. The population of these other curculionids was similar in abundance, richness and diversity at both the Douglas-fir and Grand fir snags. There were 12 species (7 genera) of Buprestidae captured and the total population was also similar adjacent to both snag species. The Cerambycidae captured during the study represented 26 species, with species richness and diversity being higher adjacent to the Grand fir snags.

Stephani J. Sandoval, Stephen P. Cook, Frank W. Merickel, and Harold L. Osborne "Diversity of the beetle (Coleoptera) community captured at artificially-created snags of Douglas-fir and Grand fir," The Pan-Pacific Entomologist 83(1), 41-49, (29 March 2007).
Received: 30 January 2006; Accepted: 1 October 2006; Published: 29 March 2007

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