Climate, history and neutrality as drivers of mammal beta diversity in Europe: insights from multiscale deconstruction
Article first published online: 10 NOV 2010
© 2010 The Authors. Journal compilation © 2010 British Ecological Society
Journal of Animal Ecology
Volume 80, Issue 2, pages 393–402, March 2011
How to Cite
Svenning, J.-C., Fløjgaard, C. and Baselga, A. (2011), Climate, history and neutrality as drivers of mammal beta diversity in Europe: insights from multiscale deconstruction. Journal of Animal Ecology, 80: 393–402. doi: 10.1111/j.1365-2656.2010.01771.x
- Issue published online: 5 FEB 2011
- Article first published online: 10 NOV 2010
- Received 1 July 2010; accepted 11 October 2010Handling Editor: Kevin McCann
- historical factors;
- ice-age refugia;
- mammal community assembly;
- peninsular effect;
- Pleistocene ice ages;
- Post-glacial recolonization;
- species composition;
- vertebrate species distributions
1. Environmental sorting, historical factors and neutral dynamics may all drive beta diversity (change in species composition across space), but their relative importance remains unresolved. In the case of European mammals, key potential drivers of large-scale beta diversity include current climate, neutral dynamics and two historical factors: Pleistocene glaciations and peninsular dynamics (immigration from extra-regional eastern faunal source areas and inter-linked relictual survival and evolutionary differentiation in isolated areas).
2. We assessed the relative importance of these drivers using a novel analytical framework to deconstruct beta diversity of non-volant mammals in Europe (138 species) into its turnover (change in species composition because of species replacements) and nestedness components (change in species composition because of species richness differences) at continental and regional (250 000 km2) scales.
3. We found continental-scale mammal beta diversity to be mainly caused by spatial turnover (99·9%), with only a small contribution (0·1%) from nestedness.
4. Current climate emerged as an important driver of beta diversity, given the strong continental-scale turnover, particularly in north–south direction, i.e., in line with the latitudinal climate gradient, and, more directly, the strong correlation of climate with spatial turnover at both continental and regional scales.
5. However, there was also evidence for the importance of non-climatic drivers. Notably, the compositional variation purely accounted for by space was greater than that purely accounted for by environment for both the turnover and the nestedness component of beta diversity. Furthermore, the strong longitudinal turnover within Southern Europe is in accordance with the region’s long-term climatic stability having allowed multiple refugia and local evolutionary diversification. As expected from peninsular dynamics, there was increasing dissimilarity with geographic distance in an east–west direction because of nestedness, but only in Central and Northern Europe.
6. In conclusion, European mammal beta diversity mainly reflects spatial turnover and only to a limited extent nestedness and is driven by current climate in combination with historical – and perhaps, neutral – dynamics. These findings suggest that a key challenge for climate-change predictive studies will be taking the influence of non-climatic factors into account.