1. Mitrani Department of Desert Ecology, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel.
2. Department of Biological Sciences, Texas Tech University, Box 43131, Lubbock, TX 79409, USA.
3. Normandeau Associates, Inc., Gainesville, FL 32601, USA.
4. Department of Biology, The University of Western Ontario, London, ON N6A 5B7, Canada.