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The maintenance of extensively exploited pastures within the Alpine mountain belt: implications for dung beetle conservation (Coleoptera: Scarabaeoidea)

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Abstract

The abandonment of marginal areas and the decline of traditional small-scale cattle-breeding is bringing about substantial changes in many areas of the Alpine mountain belt. Extensively exploited pastures, which were colonized by typical ecological communities, are now being replaced by shrublands and forests. In this paper, we evaluate the effectiveness of the maintenance of small pastures for dung beetle (Scarabaeoidea: Geotrupidae, Aphodiidae, Scarabaeidae) conservation in a protected area of the north-western Italian Alps. From July until September 2007, we studied the dung beetle coenosis in the main habitats of the mountain belt: beech forest, scots pine forest, mountain pine forest and pasture. Twenty-three species were sampled. We compared abundance, species richness, α-diversity, evenness and species turnover between the four habitat assemblages and performed a correspondence analysis based on dominance patterns of the three families. Two main ensembles were identified: a pasture ensemble, highly diverse and dominated by Scarabaeidae, and a closed habitats ensemble, less structured and dominated by Aphodiidae and Geotrupidae. Combining habitat specificity and fidelity, the IndVal method showed that half of the species collected made a strong habitat selection toward pasture, while only C. granarius (Aphodiidae) was a reliable indicator of woody areas. We therefore conclude that the loss of extensively exploited pastures may bring about fundamental changes in dung insect communities. In protected areas, a management policy intended to preserve the traditional, sustainable human activities within the mountain belt is highly recommended for the conservation of these insects.

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Abbreviations

FAG:

Beech (Fagus sylvatica L.) forest

PAS:

Pasture

PS:

Scots pine (Pinus sylvestris L.) forest

PU:

Mountain pine (Pinus uncinata Mill. ex Mirb.) forest

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Acknowledgments

We are grateful to Claudia Tocco, Teresa Petrone and Elio Cannarsa, who contributed to fieldwork and beetle identification; Matteo Negro, Enrico Caprio and Sergio Castellano for discussions and useful suggestions on data analysis; Enrico Barbero for assistance with beetle identification; Angela Roggero, who helped with lab facilities, and two anonymous reviewers that helped us improve an earlier version of the manuscript. The staff of Mont Avic Natural Park (and especially Massimo Bocca, Ermanno Broglia and Luca Ganis) gave fundamental assistance during the fieldwork and provided the cartography used in the study. Ottavio Janni revised English. The work was supported by the EU project Interreg IIIA ALCOTRA (COGEVA-VAHSA).

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  1. Dipartimento di Biologia Animale e dell’Uomo, Università degli Studi di Torino, Via Accademia Albertina 13, 10123, Torino, Italy

    Anna Lorenza Maria Macagno & Claudia Palestrini

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  1. Anna Lorenza Maria Macagno
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Correspondence to Anna Lorenza Maria Macagno.

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Macagno, A.L.M., Palestrini, C. The maintenance of extensively exploited pastures within the Alpine mountain belt: implications for dung beetle conservation (Coleoptera: Scarabaeoidea). Biodivers Conserv 18, 3309–3323 (2009). https://doi.org/10.1007/s10531-009-9643-1

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