No saturation in the accumulation of alien species worldwide.
Seebens HSenckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325 Frankfurt am Main, Germany.
Blackburn TMCentre for Biodiversity and Environment Research, Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK.
Dyer EECentre for Biodiversity and Environment Research, Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK.
Genovesi PInstitute for Environmental Protection and Research (ISPRA), Via Vitaliano Brancati 48, 00144 Rome, Italy.
Hulme PEBio-Protection Research Centre, Lincoln University, PO Box 85084, Lincoln, Christchurch 7648, New Zealand.
Jeschke JMLeibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Müggelseedamm 310, 12587 Berlin, Germany.
Pagad SIUCN Species Survival Commission Invasive Species Specialist Group (ISSG), University of Auckland, Auckland 1072, New Zealand.
Pyšek PCentre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
Winter MGerman Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany.
Arianoutsou MFaculty of Biology, Department of Ecology and Systematics, School of Sciences, National and Kapodistrian University of Athens, Athens 15784 Greece.
Bacher SDepartment of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland.
Blasius BInstitute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky Strasse 9-11, 26111 Oldenburg, Germany.
Brundu GDepartment of Agriculture, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.
Capinha CCIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Cátedra Infraestruturas de Portugal-Biodiversidade, Universidade do Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal.
Celesti-Grapow LDepartment of Environmental Biology, Sapienza University, p. Moro, 5, 00185 Rome, Italy.
Dawson WDepartment of Ecology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.
Dullinger SDepartment of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Vienna, Austria.
Fuentes NDepartamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile.
Jäger HCharles Darwin Foundation, Puerto Ayora, Santa Cruz, Galápagos, Ecuador.
Kartesz JBiota of North America Program (BONAP), 9319 Bracken Lane, Chapel Hill, North Carolina 27516, USA.
Kenis MCABI, Rue des Grillons 1, 2800 Delémont, Switzerland.
Kreft HDepartment of Biodiversity, Macroecology and Biogeography, Georg-August-University Göttingen, Büsgenweg 1, 37077 Göttingen, Germany.
Kühn IHelmholtz Centre for Environmental Research (UFZ), Department of Community Ecology, Theodor-Lieser-Strasse 4, 06120 Halle, Germany.
Lenzner BDepartment of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Vienna, Austria.
Liebhold AUS Forest Service Northern Research Station, Morgantown, West Virginia 26505, USA.
Mosena ACenter for Interamerican Studies (CIAS), Department of Experimental and Systems Ecology, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany.
Moser DDepartment of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Vienna, Austria.
Nishino MBiota of North America Program (BONAP), 9319 Bracken Lane, Chapel Hill, North Carolina 27516, USA.
Pearman DBotanical Society of Britain and Ireland (BSBI), Suite 14, Bridge House, 1-2 Station Bridge, Harrogate HG1 1SS, UK.
Pergl JDepartment of Invasion Ecology, Institute of Botany, The Czech Academy of Sciences, Zámek 1, CZ-252 43 Průhonice, Czech Republic.
Rabitsch WDepartment of Biodiversity and Nature Conservation, Environment Agency Austria, Spittelauer Laende 5, 1090 Vienna, Austria.
Rojas-Sandoval JDepartment of Botany, National Museum of Natural History, MRC-166 Smithsonian Institution, P.O. Box 37012, Washington, DC 20013, USA.
Roques AInstitut National de la Recherche Agronomique (INRA), UR 0633, Zoologie Forestière, 45075 Orléans, France.
Rorke SCentre for Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford OX10 8BB, UK.
Rossinelli SDepartment of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland.
Roy HECentre for Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford OX10 8BB, UK.
Scalera RIUCN Species Survival Commission Invasive Species Specialist Group (ISSG), Via Valentino Mazzola 38 T2 B 10, I-00142 Roma, Italy.
Schindler SDepartment of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Vienna, Austria.
Štajerová KDepartment of Invasion Ecology, Institute of Botany, The Czech Academy of Sciences, Zámek 1, CZ-252 43 Průhonice, Czech Republic.
Tokarska-Guzik BFaculty of Biology and Environmental Protection, Department of Botany and Nature Protection, University of Silesia, Jagiellonska Strasse 28, 40-032 Katowice, Poland.
van Kleunen MDepartment of Ecology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.
Walker KBotanical Society of Britain and Ireland (BSBI), Suite 14, Bridge House, 1-2 Station Bridge, Harrogate HG1 1SS, UK.
Weigelt PDepartment of Biodiversity, Macroecology and Biogeography, Georg-August-University Göttingen, Büsgenweg 1, 37077 Göttingen, Germany.
English
Although research on human-mediated exchanges of species has substantially intensified during the last centuries, we know surprisingly little about temporal dynamics of alien species accumulations across regions and taxa. Using a novel database of 45,813 first records of 16,926 established alien species, we show that the annual rate of first records worldwide has increased during the last 200 years, with 37% of all first records reported most recently (1970-2014). Inter-continental and inter-taxonomic variation can be largely attributed to the diaspora of European settlers in the nineteenth century and to the acceleration in trade in the twentieth century. For all taxonomic groups, the increase in numbers of alien species does not show any sign of saturation and most taxa even show increases in the rate of first records over time. This highlights that past efforts to mitigate invasions have not been effective enough to keep up with increasing globalization.