Abstract
The use of flight interception traps (window traps) has been criticized for catching too many species without affinity to the immediate surroundings. We study aspen retention trees left for conservation reasons in a boreal forest in south-eastern Norway, and investigate how placement of window traps affects the beetle species assemblage, abundance of habitat specialists, saproxylic species and vagrant species. We also test the correlation between beetle trappings and beetle exit holes in wood. The window traps clearly responded to the immediate surroundings of the trap. Traps located on tree trunks had a different species assemblage than traps hanging freely. Traps mounted on trees caught more aspen associated beetles and less vagrant species than their free-hanging counterparts. The differences were larger when trees were dead than alive. There was a significant positive correlation between presence of individuals in the trunk-window traps and presence of exit holes for three aspen associated species. Thus, the trapping results indicated successful reproduction, showing that aspen associated beetles are not only attracted to but also utilise aspen retention trees/high stumps left in clear-cuts. This indicates that this conservation measure in forest management can have positive, alleviating effects concerning the dead wood deficit in managed boreal forest.
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Acknowledgements
We are grateful to Espen Wandås for assistance in field, to Sindre Ligård for identification of beetles and to Steve Coulson, Erik Framstad and Frode Ødegaard for useful comments on an earlier version of the manuscript. The study was possible due to grants from the Norwegian Research Council (Part of NFR project no. 140161/110 and 163230).
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Sverdrup-Thygeson, A., Birkemoe, T. What window traps can tell us: effect of placement, forest openness and beetle reproduction in retention trees. J Insect Conserv 13, 183–191 (2009). https://doi.org/10.1007/s10841-008-9141-x
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DOI: https://doi.org/10.1007/s10841-008-9141-x