1. Department of Life Sciences; Ben-Gurion University of the Negev; Beer-Sheva 85104 Israel
2. Mitrani Department of Desert Ecology; The Jacob Blaustein Institutes for Desert Research; Ben-Gurion University of the Negev; Sede Boqer Campus Midreshet Ben-Gurion 84990 Israel
3. Department of Solar Energy and Environmental Physics; The Jacob Blaustein Institutes for Desert Research; Ben-Gurion University of the Negev; Sede Boqer Campus Midreshet Ben-Gurion 84990 Israel
4. Department of Biology; Washington University; St. Louis MO 63130 USA
5. Department of Evolutionary and Environmental Ecology; University of Haifa; Haifa 31905 Israel