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Does natural reforestation represent a potential threat to dung beetle diversity in the Alps?

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Abstract

Traditional agro-pastoral practices are in decline over much of the Alps, resulting in the complete elimination of livestock grazing in some areas. Natural reforestation following pastoral abandonment may represent a significant threat to alpine biodiversity, especially that associated with open habitats. This study presents the first assessment of the potential effects of natural reforestation on dung beetles by exploring the relationships between the beetle community (abundance, diversity, species turnover and assemblage structure) and the vegetation stages of ecological succession following pastoral abandonment. A hierarchical sampling design was used in the montane belt of the Sessera Valley (north-western Italian Alps). Dung beetles were sampled across 16 sampling sites set in four habitat types corresponding to four different successional stages (pasture, shrub, pioneer forest and beech forest) at two altitudinal levels. The two habitats at the extremes of the ecological succession, i.e. pasture and beech forest, had the greatest effect on the structure of local dung beetle assemblages. Overall, dung beetle abundance was greater in beech forest, whereas species richness, Shannon diversity and taxonomic diversity were significantly higher in pasture, hence suggesting this latter habitat can be considered as a key conservation habitat. Forests and pastures shared a lower number of species than the other pairs of habitats (i.e. species turnover between these two habitats was the highest). The two intermediate seral stages, i.e. shrub and pioneer forest, showed low dung beetle abundance and diversity values. Local dung beetle assemblages were also dependent on season and altitude; early-arriving species were typical of pastures of high elevation, whereas late-arriving species were typical of beech forests. It is likely that grazing in the Alps will continue to decrease in the future leading to replacement of open habitats by forest. This study suggests therefore that, at least in the montane belt, reforestation may have potentially profound and negative effects on dung beetle diversity. Maintaining traditional pastoral activities appears to be the most promising approach to preserve open habitats and adjacent beech forests, resulting in the conservation of species of both habitats.

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Acknowledgments

We thank Giovanni Dellacasa for his invaluable help in identifying certain Aphodiidae species. We express gratitude to Tommaso Biglino and Davide Bocola who helped us with the fieldwork. Dan Chamberlain checked the English and made useful suggestions to improve the manuscript.

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  1. Dipartimento Scienze della Vita e Biologia dei Sistemi, Università di Torino, via Accademia Albertina 13, 10123, Turin, Italy

    Claudia Tocco, Matteo Negro, Antonio Rolando & Claudia Palestrini

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  1. Claudia Tocco
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  2. Matteo Negro
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  3. Antonio Rolando
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  4. Claudia Palestrini
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Correspondence to Claudia Tocco.

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Tocco, C., Negro, M., Rolando, A. et al. Does natural reforestation represent a potential threat to dung beetle diversity in the Alps?. J Insect Conserv 17, 207–217 (2013). https://doi.org/10.1007/s10841-012-9498-8

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