Abstract
Deadwood-associated species are increasingly targeted in forest biodiversity conservation. In order to improve structural biodiversity indicators and sustainable management guidelines, we need to elucidate ecological and anthropogenic drivers of saproxylic diversity. Herein we aim to disentangle the effects of local habitat attributes which presumably drive saproxylic beetle communities in temperate lowland deciduous forests. We collected data on saproxylic beetles in 104 oak and 49 beech stands in seven French lowland forests and used deadwood, microhabitat and stand features (large trees, openness) as predictor variables to describe local forest conditions. Deadwood diversity and stand openness were consistent key habitat features for species richness and composition in deciduous forests. Large downed deadwood volume was a significant predictor of beetle species richness in oak forests only. In addition, the density of cavity- and fungus-bearing trees had weak but significant effects. We recommend that forest managers favor the local diversification of deadwood types, especially the number of combinations of deadwood positions and tree species, the retention of large downed deadwood and microhabitat-bearing trees in order to maximize the saproxylic beetle diversity at the stand scale in deciduous forests. To improve our understanding of deadwood-biodiversity relationships, further research should be based on targeted surveys on species-microhabitat relationships and should investigate the role of landscape-scale deadwood resources and of historical gaps in continuity of key features availability at the local scale.
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Acknowledgments
We are grateful to Y. Paillet, A. Lassauce, C. Moliard (Irstea), T. Noblecourt, T. Barnouin, F. Soldati (ONF), N. Debaive (RNF), J. Willm, L. Burnel (INRA) and all the local forest managers for their field and laboratory work, and to F. Gosselin for helpful comments during the project, and Vicki Moore who checked the English language, and two anonymous reviewers whose detailed comments deeply improved our manuscript. This research was funded by the French Ministry in Charge of the Ecology through the BGF program (convention RESINE CVOJ000150, convention 10-MBGD-BGF-1-CVS-092, n°CHORUS 2100214651) and the National Forestry Board (ONF-Cemagref convention, Action 5, 2008). Part of this work was funded by the French Environment and Energy Management Agency (ADEME).
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Bouget, C., Larrieu, L., Nusillard, B. et al. In search of the best local habitat drivers for saproxylic beetle diversity in temperate deciduous forests. Biodivers Conserv 22, 2111–2130 (2013). https://doi.org/10.1007/s10531-013-0531-3
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DOI: https://doi.org/10.1007/s10531-013-0531-3