1. Informatics Institute, University of Missouri, Columbia, Missouri 65211 USA
2. Department of Computer Science, University of Missouri, Columbia, Missouri 65211 USA
3. Department of Information Science, Pennsylvania State University–Great Valley, Malvern, Pennsylvania 19355 USA
4. Department of Plant Biology, University of Illinois, Urbana, Illinois 61801 USA
5. Center for Tropical Paleoecology and Archaeology, Smithsonian Tropical Research Institute, Apartado 0843, 03092 Balboa, Ancón, República de Panamá