1. Department of Ecology and Evolution; University of Lausanne; Biophore Building CH-1015 Lausanne Switzerland
2. Section of Conservation Biology; Department of Environmental Sciences; University of Basel; St Johanns-Vorstadt 10 CH-4056 Basel Switzerland
3. Karch (Centre de coordination pour la protection des amphibiens et des reptiles de Suisse); Passage Maximilien-de-Meuron 6; CH-2000 Neuchâtel Switzerland
4. Siebeneichenstrasse 31; CH-5634 Merenschwand Switzerland