Biodiversity research: data without theory—theory without data

1 Plant Ecology, Institute of Biology, Freie Universität Berlin, Berlin, Germany, 2 Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, Germany, GeoZentrum Nordbayern, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany, Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity, Berlin, Germany, 5 Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany, 6 Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland, 7 Leibniz Center for Agricultural Landscape Research (ZALF), Müncheberg, Germany, 8 Leibniz Institute for Zoo and Wildlife Research (IZW), Berlin, Germany, 9 Biodiversity Research/Systematic Botany, University of Potsdam, Potsdam, Germany, 10 Institute of Geoecology, Technische Universität Braunschweig, Braunschweig, Germany, 11 Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany, 12 Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany, 13 Plant Ecology and Conservation Biology, University of Potsdam, Potsdam, Germany