1. CIDE-CSIC; Ctra. Naquera Km 4.5 (IVIA), Montcada Valencia 46113 Spain
2. Western Ecological Research Center; Sequoia Field Station; US Geological Survey; Three Rivers CA 93271 USA
3. Department of Ecology and Evolutionary Biology; University of California; Los Angeles CA 90095 USA
4. Department of Biological Sciences; Texas Tech University; Lubbock TX 79409 USA