1. U.S. Geological Survey, Integrated Information Dissemination Division, Data Science Branch; Tucson AZ USA
2. Flathead Lake Biological Station; University of Montana; Polson MT USA
3. U.S. Geological Survey, Grand Canyon Monitoring and Research Center; Flagstaff AZ USA
4. Department of Plant Biology and Ecology; University of the Basque Country; Bilbao Spain