1. Centre National de la Recherche Scientifique and Univ. Paul Sabatier Toulouse III; SETE Station d'Ecologie Théorique et Expérimentale; UMR 5321 Moulis France
2. Univ. Catholique de Louvain, Earth and Life Inst.; Biodiversity Research Centre; Louvain-la-Neuve Belgique
3. Laboratoire Evolution and Diversité Biologique, UMR 5174; Univ. Paul Sabatier Toulouse III; Toulouse France
4. Eawag: Swiss Federal Inst. of Aquatic Science and Technology, Dept of Aquatic Ecology; Dübendorf Switzerland
5. Dept of Evolutionary Biology and Environmental Studies; Univ. of Zurich; Zürich Switzerland
6. Dept of Biology; Univ. of Florida; Gainesville FL USA
7. Inst. des Sciences de l'Evolution; Univ. Montpellier 2; CNRS, IRD, EPHE, CC65 Montpellier France
8. School of Biological Sciences; Univ. of Aberdeen; Aberdeen UK