No saturation in the accumulation of alien species worldwide

University of Vienna, Carl von Ossietzky Universität Oldenburg, Senckenberg Biodiversity and Climate Research Centre, Zoological Society of London, Stellenbosch University, King Saud University, University College London, The University of Adelaide, International Union for Conservation of Nature (United Kingdom), Istituto Superiore per la Protezione e la Ricerca Ambientale, Lincoln University, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin Brandenburg Institute of Advanced Biodiversity Research, Freie Universität Berlin, University of Auckland, International Union for Conservation of Nature, Czech Academy of Sciences, Charles University, Institute of Botany of the Slovak Academy of Sciences, Czech Academy of Sciences, Institute of Botany, German Centre for Integrative Biodiversity Research, National and Kapodistrian University of Athens, University of Fribourg, University of Sassari, Universidade do Porto, Zoological Research Museum Alexander Koenig, Infraestruturas de Portugal (Portugal), Sapienza University of Rome, University of Konstanz, Durham University, University of Concepción, Charles Darwin Foundation, Bank of America, ProThera Biologics (United States), CABI Switzerland, University of Göttingen, Helmholtz Centre for Environmental Research, Martin Luther University Halle-Wittenberg, US Forest Service, Northern Research Station, Bielefeld University, Botanical Society of Britain and Ireland, Environment Agency Austria, Smithsonian Institution, National Museum of Natural History, Institut National de la Recherche Agronomique du Niger, UK Centre for Ecology & Hydrology, Institute of Environmental Protection, University of Silesia in Katowice, National Institute for Agro-Environmental Sciences