1. Department of Botany; University of Hawaii Manoa; 3190 Maile Way Honolulu HI 96822 USA
2. Department of Biology; University of Tübingen; Auf der Morgenstelle 5 72076 Tübingen Germany
3. Laboratory of Isotope Biogeochemistry; Bayreuth Center of Ecology and Environmental Research (BayCEER); University of Bayreuth; 95440 Bayreuth Germany
4. Department of Ecology and Evolutionary Biology; University of California-Irvine; Irvine CA 92697 USA