Anthropogenic-based regional-scale factors most consistently explain plot-level exotic diversity in grasslands

Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1, Environmental Decisions Group, University of Queensland, Brisbane, 4072, Australia, Queensland University of Technology, School of Earth, Environmental and Biological Sciences, Brisbane Qld, 4001 Australia, Department of Ecology, Evolution, and Behavior, University of Minnesota, 1987 Upper Buford Circle, St Paul, MN 55108, USA, Department of Zoology, University of Wisconsin, 250 North Mills Street, Madison, WI 53704, USA, Department of Ecology, Evolution and Organismal Biology, Iowa State University, 133 Bessey Hall, Ames, IA 50011, USA, Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland, Department of Wildland Resources and the Ecology Center, Utah State University, 5230 Old Main, Logan, UT 84322, USA, Ecology, Behavior and Evolution Section, University of California, San Diego, 9500 Gilman Drive 0116, LaJolla, CA 92093, USA, Department of Ecology and Evolutionary Biology, RL-1120, University of Colorado, 1560 30th Street, Boulder, CO, 80309, USA, Commonwealth Scientific and Industrial Research Organisation Ecosystem Sciences, Private Bag 5, Wembley, WA, 6913, Australia, School of Environmental and Forest Sciences, Box 354115, University of Washington, Seattle, WA 98195-4115, USA, Grassland Soil and Water Research Lab, US Department of Agriculture Agricultural Research Service (USDA-ARS), 808 East Blackland Road, Temple, TX 76502, USA, Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06520, USA, Australian Research Centre for Urban Ecology, Melbourne, Australia, School of Biological Sciences, Monash University, Vic. 3800, Australia, La Trobe University, Melbourne, Australia, Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK ABSTRACT