Abstract
Research on changes in biodiversity due to the abandonment of forestry is important in understanding the role of reserves in conservation. The aim of this study was to investigate whether changes have occurred in species richness, abundance and composition of ground, longhorn and bark beetles due to habitat changes as a result of the cessation of forest management. We surveyed ten managed and ten abandoned forest plots in two watersheds located in the north-eastern Italian alpine region, which share a common history of use, climate regimes, stand structure and topography. Ground beetles, and longhorn and bark beetles were collected with pitfall and flight-intercept window traps, respectively, from May to mid-October 2010. The three beetle taxa responded differently to changes in habitat features and management cessation. Differences in individual species responses between the two watersheds may indicate a role of management abandonment through its impact on forest habitat structure. For instance, ground beetle species mainly responded negatively to soil moisture and positively to understorey vegetation cover. Unexpectedly, saproxylic species responded variably, and often negatively, to deadwood features in these forests, but did respond positively to the volume of standing Abies alba trees. The assemblages of carabids and bark beetles differed between the two watersheds. Our results confirmed that 50 years of forest management cessation resulted in changes in the biodiversity of beetles in alpine forests, likely due to their response to changes in habitat structure. Moreover, we expect that where the unplanned abandonment of forestry practices and habitat rewilding are undergoing, like in many marginal areas of Europe, similar habitat structure dynamics and beetle responses are likely to occur spontaneously.
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Acknowledgments
We thank P. Brandmayr and A. Casale for providing useful information on the life history of the carabid beetles collected. This project was supported by the Italian Ministry of Agricultural, Food and Forestry Policies, State Forestry Corps, within the framework of the research agreement No. 767/2008 with the University of Padova (scientific coordinator: TS). The authors express their thanks to A. Andrighetti and F. Viola for their support in coordinating the work. Finally, we thank the two anonymous reviewers for their detailed comments that have improved this manuscript considerably.
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Sitzia, T., Campagnaro, T., Gatti, E. et al. Wildlife conservation through forestry abandonment: responses of beetle communities to habitat change in the Eastern Alps. Eur J Forest Res 134, 511–524 (2015). https://doi.org/10.1007/s10342-015-0868-0
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DOI: https://doi.org/10.1007/s10342-015-0868-0