1. Dept of Biological Sciences; Univ. of Illinois at Chicago; 845 W. Taylor St. Chicago IL 60304 USA
2. Mitrani Dept of Desert Ecology, Blaustein Inst. for Desert Research; Ben-Gurion University of the Negev; Midreshet Ben-Gurion Israel
3. Dept of Zoology; Univ. of Wisconsin; Madison WI USA