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Saproxylic beetles in high stumps and residual downed wood on clear-cuts and in forest edges

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This study evaluates how the placement and the different possible outcomes of a spruce retention tree affected species richness and assemblages of spruce-associated saproxylic beetles. In a field experiment in the boreal zone of central Norway, high stumps were created and compared with residual wood pieces (i.e. top boles with branches), in clear-cuts versus in forest edges. Flight interception traps were mounted close to the substrate. The results were analysed using rarefaction techniques, ordination (DCA) and anova. It was found that the placement of retention trees of spruce does matter: beetle assemblages were significantly different in stumps in the four treatments. For all species pooled, the species richness was higher in stumps in clear-cuts than in stumps or boles in the forest edge. Four red-listed species were more abundant near stumps than boles, and two red-listed species were more abundant in clear-cuts than forest edge. To cater for the variety of habitat preferences among forest beetles in managed forest, managers should leave both standing spruce trees (many of which will end up as windthrown, downed boles) and some high stumps (to secure some upright dead wood), in both exposed clear-cut and semi-shaded forest edge.
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Keywords: Beetles (Coleoptera); Picea abies; boreal forest management; clear-cut; forest edge; high stumps; red-listed; retention; saproxylic; sun exposure

Document Type: Research Article

Affiliations: 1: Norwegian University of Life Sciences (UMB), Ås, Norway 2: Norwegian Institute for Nature Research (NINA), Oslo, Norway

Publication date: 2009-10-01

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