Abstract
Dung beetles are indispensable in pasturelands, especially when poor efficiency of earthworms and irregular rainfall (e.g. under a Mediterranean climate) limit pad decomposition. Although observed and projected species range shifts and extinctions due to climate change have been documented for plants and animals, little effort has focused on the response of keystone species such as the scarab beetles of dung beetle decomposers. Our study aims to forecast the distribution of 37 common Scarabaeidae dung beetle species in France, Portugal and Spain (i.e. more than half of the western European Scarabaeidae fauna) in relation to two climate change scenarios (A2 and B1) for the period leading to 2080. On average, 21 % of the species should change in each 50-km UTM grid cell. The highest faunistic turnover rate and a significant increase in species richness are expected in the north of the study area while a marked impoverishment is expected in the south, with little difference between scenarios. The potential enrichment of northern regions depends on the achievement of the northward shift of thermophilous species, and climate change is generally likely to reduce the current distribution of the majority of species. Under these conditions, the distribution of resource—i.e. the extent and distribution of pastures—will be a key factor limiting species’ responses to climate change. The dramatic abandonment of extensive grazing across many low mountains of southern Europe may thus represent a serious threat to dung beetle distribution changes.
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Acknowledgments
We are very grateful to John Thompson (UMR 5175 CEFE, Montpellier, France) who revised the English version of the manuscript. ED received financial support from the Agence Nationale de la Recherche contract ANR-05-BDIV-014. WT received support from European Commission’s FP6 ECOCHANGE (Challenges in assessing and forecasting biodiversity and ecosystem changes in 17 Europe, No 066866 GOCE) project.
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Dortel, E., Thuiller, W., Lobo, J.M. et al. Potential effects of climate change on the distribution of Scarabaeidae dung beetles in Western Europe. J Insect Conserv 17, 1059–1070 (2013). https://doi.org/10.1007/s10841-013-9590-8
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DOI: https://doi.org/10.1007/s10841-013-9590-8