A comparison of three methods to survey saproxylic beetles in hollow oaks |
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Authors: | Thomas Ranius Nicklas Jansson |
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Affiliation: | (1) Department of Entomology, Swedish University of Agricultural Sciences, SE-75007, Uppsala, Sweden;(2) Environmental Department, The County Administration Board of Östergötland, SE-58186 Linköping, Sweden |
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Abstract: | One of the most endangered assemblages of species in Europe is insectsassociated with old trees. For that reason there is a need of developing methodsto survey this fauna. This study aims at comparing three methods – windowtrapping, pitfall trapping and wood mould sampling – to assess speciesrichness and composition of the saproxylic beetle fauna in living, hollow oaks.We have used these methods at the same site, and to a large extent in the sametrees. Useful information was obtained from all methods, but they partiallytarget different assemblages of species. Window trapping collected the highestnumber of species. Pitfall trapping collected beetles associated with treehollows which rarely are collected by window traps and therefore it isprofitable to combine these two methods. As wood mould sampling is the cheapestmethod to use, indicator species should preferably be chosen among specieswhich are efficiently collected with this method. |
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Keywords: | Pitfall traps Saproxylic beetles Trapping efficiency Tree hollows Window traps |
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