Saproxylic Beetles in Standing Dead Wood Density in Relation to Substrate Sun-exposure and Diameter |
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Authors: | Email author" target="_blank">Anders?LindheEmail author ?ke?Lindel?w Nils??senblad |
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Institution: | (1) Department of Entomology, SLU, SE-750 07, Uppsala, Sweden;(2) Department of Biometry and Informatics, SLU, SE-750 07, Uppsala, Sweden |
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Abstract: | Species-specific densities of saproxylic beetles in cut 4-m high, medium to large diameter stumps of spruce, birch, aspen
and oak were monitored for 7 years after cutting, by trapping emerging insects within seasonally applied net enclosures. A
total of 47,038 individuals, representing 316 saproxylic beetle species including 40 red-listed species, were recorded. Densities
of 86 species were modelled in relation to stump diameter and measured levels of sun-exposure. Two thirds of the species favoured
semi- or fully exposed substrates, while one third performed better in shade. Few species seemed to be specifically adapted
to semi-exposed conditions. Diameter was generally of less importance than exposure, and similar numbers of species favoured
medium and large diameter substrates. Group mean diameter and exposure calculated from means per individual and species were
similar for groups of modelled and non-modelled species, and for groups of red-listed and non-red-listed species, respectively.
This indicates that the proportions found in the models are representative for the diverse regional fauna of saproxylic beetles
that utilise high stumps of spruce, birch, aspen and oak in early stages of decay. The results suggest that sun-exposed dead
wood substrates generated and retained in managed forest landscapes are potentially important for many species. However, stands
of unmanaged self-thinning successions of deciduous trees, as well as substantial areas of old-growth spruce-forests are also
necessary to address the wide spectrum of saproxylic beetles. |
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Keywords: | Conservation Dead wood quality Dead wood diameter Forest dynamics Forest management High stumps Red-listed beetles Saproxylic beetles Sun-exposure |
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