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The larger, the better? Effects of delayed diameter-limit cutting on old-growth attributes and saproxylic beetle diversity in temperate oak forests

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Abstract

Intensive management implies harvesting large, old trees, which reduces the old-growth attributes. This negatively affects biodiversity, especially saproxylic beetles. In managed temperate oak forests, rotation extension induced by increasing the diameter threshold of final harvest by about 10 cm compared to conventional practices (i.e. DBH around 70 cm) might mitigate this negative effect. Here, we used a gradient of the proportion of overmature trees (DBH ≥ 80 cm) among mature trees (DBH ≥ 70 cm) across plots of high oak French forests to test the potential effect of increasing diameter threshold on (1) structural features and (2) species composition and diversity of saproxylic beetles communities. We assessed deadwood and microhabitats availability (i.e. volume/density and diversity) and canopy openness in 81 1-ha plots across eleven French forests. Results highlighted that a larger proportion of overmature trees, for a given density of mature trees, had limited effects on structural features: only cavities density showed a significant positive response, with no cascading effect on cavicolous beetles. Moreover, the proportion of overmature trees had no significant effect on the composition of saproxylic beetles communities (and ecological variables altogether explained only 17% of the composition inertia). By contrast, mature tree density enhanced microhabitat density and indirectly increased the abundance of rare species. Thus, shifting DBH from 70 to 80 cm in high oak forest could have no or limited effect on saproxylic beetles conservation. Improved strategies might rather stem from combining (1) longer rotation extension and (2) less intensive management practices in extended rotation stands.

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Acknowledgements

We are grateful to Carl Moliard for field assistance and to Thierry Noblecourt (Scolytidae), Fabien Soldati (Tenebrionidae), Thomas Barnouin (Elateridae, Ptinidae (excl. Ptininae)), Olivier Rose and Bernard Moncoutier (Ciidae, Latridiidae, Cryptophagidae, Leiodidae), Philippe Millarakis (Histeridae), Christian Perez (Pselaphidae, Scydmaenidae), Julien Fleury (Curculionidae) and Benjamin Calmont (Ptininae) for specimen identification. We thank the agents from the National Forest Office involved in our project for their considerable help. We also thank Yoan Paillet for constructive statistical comments, Vicki Moore for refining the English manuscript, as well as three anonymous reviewers for their critical comments on the manuscript. This study was funded by the French National Forest Office, the French National Museum of Natural History and French Ministry in charge of Ecology.

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Correspondence to Gwendoline Percel.

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Communicated by Dr. Claus Bässler.

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Percel, G., Parmain, G., Laroche, F. et al. The larger, the better? Effects of delayed diameter-limit cutting on old-growth attributes and saproxylic beetle diversity in temperate oak forests. Eur J Forest Res 137, 237–249 (2018). https://doi.org/10.1007/s10342-018-1103-6

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  • DOI: https://doi.org/10.1007/s10342-018-1103-6

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