1. Mitrani Department of Desert Ecology; Blaustein Institutes for Desert Research; Ben-Gurion University; Midreshet Ben-Gurion 8499000 Israel
2. Department of Bioscience; Aarhus University; Ny Munkegade 116, building 1540 8000 Aarhus C Denmark
3. Department Biology II; Ludwig Maximilians University Munich; Großhaderner Str. 2 82152 Planegg-Martinsried Germany