Institut for Biologi

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J.-C. Svenning

Alien plant invasion hotspots and invasion debt in European woodlands

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  • Viktoria Wagner, University of Alberta, Masaryk University
  • ,
  • Martin Večeřa, Masaryk University
  • ,
  • Borja Jiménez-Alfaro, University of Oviedo
  • ,
  • Jan Pergl, Czech Academy of Sciences
  • ,
  • Jonathan Lenoir, Universite de Picardie Jules Verne
  • ,
  • Jens Christian Svenning
  • Petr Pyšek, Czech Academy of Sciences, Charles University
  • ,
  • Emiliano Agrillo, ?Italian Institute for Environmental Protection and Research
  • ,
  • Idoia Biurrun, University of the Basque Country
  • ,
  • Juan Antonio Campos, University of the Basque Country
  • ,
  • Jörg Ewald, Weihenstephan-Triesdorf University of Applied Sciences
  • ,
  • Federico Fernández-González, University of Castilla-La Mancha
  • ,
  • Ute Jandt, Martin Luther University Halle-Wittenberg, German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
  • ,
  • Valerijus Rašomavičius, Institute of Botany Lithuanian
  • ,
  • Urban Šilc, Scientific Research Centre of the Slovenian Academy of Sciences and Arts
  • ,
  • Željko Škvorc, University of Zagreb
  • ,
  • Kiril Vassilev, Bulgarian Academy of Sciences
  • ,
  • Thomas Wohlgemuth, Swiss Federal Institute for Forest, Snow and Landscape Research
  • ,
  • Milan Chytrý, Masaryk University

Questions: European woodlands harbor at least 386 alien plant species but the factors driving local invasions remain unknown. By using a large vegetation-plot database, we asked how local richness and abundance of alien species vary by regions, elevation, climate, soil properties, human disturbance, and habitat types. Location: Western, central and southern Europe. Methods: We linked consolidated data from the European Vegetation Archive (16,211 plots) to a habitat classification scheme, climate, soil properties and human disturbance variables. In addition, we used 250 km × 250 km regional grid cells to test whether local patterns differ among regions. We used generalized additive models (GAMs) and quantile GAMs to explore how relative alien species richness and the sum of alien species covers per plot relate to predictors. Random Forest analyses (RFs) were employed to assess the importance of individual predictors that were not multicollinear. Results: Relative alien species richness and the sum of alien species covers varied across regions and habitat types, with effects being more pronounced at the maximum rather than average responses. Both response variables declined with increasing elevation and distance to the nearest road or railroad and increased with the amount of sealed soil. Maxima in fitted functions matched plots from regional invasion hotspots in northwestern and central Europe. RFs accounted for 39.6% and 20.9% of the total variation in relative alien species richness and the sum of alien species covers, respectively, with region and habitat being the most important variables. Conclusions: The importance of maximum response quantiles and the prevalence of regional hotspots point to invasion debt in European woodlands. As alien plants expand further, their species richness and abundance in woodlands will be likely driven by the shared effects of the introduction and planting history, differences in the invaded habitat types, and dispersal corridors.

OriginalsprogEngelsk
Artikelnummere13014
TidsskriftJournal of Vegetation Science
Vol/bind32
Nummer2
Antal sider15
ISSN1100-9233
DOI
StatusUdgivet - mar. 2021

Bibliografisk note

Funding Information:
VW initiated this study as a part of the InvasEVe project financed by the SoMoPro II program and considers it as part of her Discovery Grant from the Canadian Natural Science and Engineering Research Council. VW's research leading to these results has acquired a financial grant from the People Program (Marie Curie Action) of the Seventh Framework Program of the EU according to REA Grant Agreement No. 291782, and it was further co‐financed by the South‐Moravian Region. MV and MC were supported by the Czech Science Foundation (19‐28491X). PP and JP were supported by the Czech Science Foundation (19‐28807X) and the Czech Academy of Sciences (RVO 67985939). JCS considers this work a contribution to his VILLUM Investigator project “Biodiversity Dynamics in a Changing World” funded by VILLUM FONDEN (grant 16549). IB and JAC were funded by the Basque Government (IT936‐16). FFG was funded by the Plan Propio of the UCLM (2020‐GRIN‐29214)

Publisher Copyright:
© 2021 International Association for Vegetation Science

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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