Journal Title
Title of Journal: Biodivers Conserv
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Abbravation: Biodiversity and Conservation
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Publisher
Springer Netherlands
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Authors: Jörg Brunet Gunnar Isacsson
Publish Date: 2009/02/14
Volume: 18, Issue: 9, Pages: 2387-
Abstract
The influence of spatial location and density of beech snags on species diversity and distribution patterns of saproxylic beetles was studied in a 2400 ha forest landscape in southern Sweden Complete snag surveys were combined with a beetle survey using small window traps directly attached to the beech snags The density of beech snags ≥30 cm dbh varied between one and seven snags per ha within the study area corresponding to 11–51 m3/ha A total of 2610 specimens of 180 saproxylic beetles species were trapped of which 19 species were redlisted Within the study area the number of redlisted and formerly redlisted species was highest around traps in oldgrowth stands intermediate in managed stands contiguous with oldgrowth and lowest in managed stands isolated from oldgrowth by a two kmwide zone without beech forest Logistic regressions revealed negative relationships between distance to oldgrowth forest and occurrence of eleven species among them six redlisted or formerly redlisted species The number of non redlisted species was not correlated with isolation from oldgrowth forest The number of redlisted species also increased with snag density within 200–300 m around the traps Our results suggest that redlisted species generally have a lower dispersal capacity than other saproxylic beetles We conclude that retention of dead wood close to existing populations is more beneficial for redlisted species than an even distribution of snags across the forest landscapeWe are very grateful to Emma Holmström and Prisca Schäffer for help with field work and GISanalyses and to Rickard Andersson for determination of the saproxylic beetles We would also like to thank Oddvar Fiskesjö Carina Zätterström Anders Ekstrand and Bo Edlund for providing information and access to the study area and Eric Agestam and Jogeir Stokland for providing data files Valuable comments from two reviewers helped to improve the paper Many thanks to Vikki Bengtsson for language revision The project was financed by the research program Sustainable Management of Broadleaved Forest at the Swedish University of Agricultural Sciences SLU Species determination was financed by the Regional Council of Skåne
Keywords:
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