Correlations between global and regional measures of invasiveness vary with region size

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2013
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Winter, Marten
Pyšek, Petr
Kartesz, John
Nishino, Misako
Fuentes, Nicol
Chytrý, Milan
Celesti-Grapow, Laura
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NeoBiota. 2013, 16, pp. 59-80. ISSN 1314-2488. eISSN 1314-2488. Available under: doi: 10.3897/neobiota.16.4351
Zusammenfassung

We aimed to assess the utility of the Global Compendium of Weeds (GCW) as an indicator of plant invasiveness, by relating it to invasiveness at smaller scales. We correlated two global measures of invasiveness for alien plant species taken from the GCW (the total number of references for each species and the number of continental areas they are reported from), against distribution data from 18 regions (countries and continents). To investigate relationships between correlation strength and region size and spatial resolution (size of distribution units), we conducted meta-analyses. Finally, invasiveness measures were correlated against the number of habitats occupied by alien plant species and their median abundance in those habitats, in fine-scale vegetation plots in the Czech Republic and the state of Montana (USA). The majority of Spearman’s rho coefficients between GCW-derived invasiveness and regional distributions were less than 0.4. Correlation strength was positively related to region size and resolution. Correlations were weaker when the number of habitats occupied by a species, and species abundances within occupied habitats, were considered. We suggest that the use of the GCW as an invasiveness measure is most appropriate for hypotheses posed at coarse, large scales. An exhaustive synthesis of existing regional distributions should provide a more accurate index of the global invasiveness of species.

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570 Biowissenschaften, Biologie
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Abundance, alien species distribution, database, exotic plant, global invasiveness, range size
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ISO 690DAWSON, Wayne, Lidewij H. KESER, Marten WINTER, Petr PYŠEK, John KARTESZ, Misako NISHINO, Nicol FUENTES, Milan CHYTRÝ, Laura CELESTI-GRAPOW, Mark VAN KLEUNEN, 2013. Correlations between global and regional measures of invasiveness vary with region size. In: NeoBiota. 2013, 16, pp. 59-80. ISSN 1314-2488. eISSN 1314-2488. Available under: doi: 10.3897/neobiota.16.4351
BibTex
@article{Dawson2013Corre-24247,
  year={2013},
  doi={10.3897/neobiota.16.4351},
  title={Correlations between global and regional measures of invasiveness vary with region size},
  volume={16},
  issn={1314-2488},
  journal={NeoBiota},
  pages={59--80},
  author={Dawson, Wayne and Keser, Lidewij H. and Winter, Marten and Pyšek, Petr and Kartesz, John and Nishino, Misako and Fuentes, Nicol and Chytrý, Milan and Celesti-Grapow, Laura and van Kleunen, Mark}
}
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