Niche breadth explains the range size of European-centred butterflies, but dispersal ability does not.
Johannes Hausharter, Sonia Rashid, Johannes Wessely, Patrick Strutzenberger, Dietmar Moser, Andreas Gattringer, Konrad Fiedler, Karl Hülber, Stefan Dullinger
Author Information
Johannes Hausharter: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Sonia Rashid: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Johannes Wessely: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Patrick Strutzenberger: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Dietmar Moser: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Andreas Gattringer: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Konrad Fiedler: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Karl Hülber: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Stefan Dullinger: Department of Botany and Biodiversity Research University of Vienna Vienna Austria. ORCID
Aim: The breadth of ecological niches and dispersal abilities have long been discussed as important determinants of species' range sizes. However, studies directly comparing the relative effects of both factors are rare, taxonomically biased and revealed inconsistent results. Location: Europe. Time Period: Cenozoic. Major Taxa: Butterflies, Lepidoptera. Methods: We relate climate, diet and habitat niche breadth and two indicators of dispersal ability, wingspan and a dispersal tendency index, to the global range size of 369 European-centred butterfly species. The relative effects of these five predictors and their variation across the butterfly phylogeny were assessed by means of phylogenetic generalized least squares models and phylogenetically weighted regressions respectively. Results: Climate niche breadth was the most important single predictor, followed by habitat and diet niche breadth, while dispersal tendency and wingspan showed no relation to species' range size. All predictors together explained 59% of the variation in butterfly range size. However, the effects of each predictor varied considerably across families and genera. Main Conclusions: Range sizes of European-centred butterflies are strongly correlated with ecological niche breadth but apparently independent of dispersal ability. The magnitude of range size-niche breadth relationships is not stationary across the phylogeny and is often negatively correlated across the different dimensions of the ecological niche. This variation limits the generalizability of range size-trait relationships across broad taxonomic groups.
