Abstract
Context
Species distributions are influenced by habitat conditions and ecological processes at multiple spatial scales. An understanding of the importance of habitat characteristics at different spatial scales is important when developing biodiversity conservation measures.
Objectives
We investigated the effect of habitat characteristics or amount at three spatial scales on the occurrence of saproxylic (=dead wood-dependent) beetles.
Methods
Saproxylic beetles were sampled under the bark of dead wood in a managed forest landscape in central Sweden. We modelled the occurrence probability in dead wood items of 44 species (all species occurring in >2 % of the items), based on dead wood item characteristics, forest stand characteristics, and habitat connectivity (i.e. area of potentially suitable forest stands in the surrounding of each stand), using hierarchical Bayesian regression.
Results
For the majority of species, dead wood item characteristics (especially tree species and whether standing or downed) were more important than measured stand characteristics and habitat connectivity. Whether the stands were clear-cuts, mature forests, or reserves affected some species, whereas the stand-level amount of dead wood per hectare was not important for any species. Habitat connectivity improved the occurrence models for about a half of the species, but there were both positive and negative relationships, and they were generally weak.
Conclusions
Forest management should include creation and retention of a high diversity of dead wood to sustain habitat for all species. In a forest-dominated landscape, the spatial distribution of dead wood is of little importance for common saproxylic beetle species.
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Acknowledgments
We thank Holmen Skog for access to their databases. Matilda Apelqvist, Björn Forsberg, Markus Franzén, David Isaksson, Niklas Jönsson, Mats Larsson, Per Larsson, Carola Orrmalm, Erik Sahlin, Måns Svensson, and Jan ten Hoopen helped with field and laboratory work. Stig Lundberg identified the beetles. Håkan Berglund, Matthew Hiron, Joakim Hjältén, and Tobias Jeppsson provided valuable comments on the manuscript. The study was supported by the Mistra research program Future Forests (to TR).
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Ranius, T., Johansson, V., Schroeder, M. et al. Relative importance of habitat characteristics at multiple spatial scales for wood-dependent beetles in boreal forest. Landscape Ecol 30, 1931–1942 (2015). https://doi.org/10.1007/s10980-015-0221-5
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DOI: https://doi.org/10.1007/s10980-015-0221-5
Keywords
- Connectivity
- Dead wood
- Hierarchical Bayesian regression
- Island effect
- Occurrence patterns
- Sampling effect
- Saproxylic beetles
- Threshold