Knowing what we count: a comment on Guo

Pyšek, Petr

doi:10.3897/neobiota.10.1976

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…On average, in the 48 conterminous US states, about 25% of naturalized plant species are domestically introduced from other states, which significantly increased the exotic richness but simultaneously decreased the earlier reported native richness in each state (Kartesz 2011). For example, out of 865 exotic plant species in North Carolina, 166 are actually introduced from other states but treated as 'native' species in earlier analyzes (for related statements and consequences, see Rejmánek and Randall 1994, McKinney 2005, Guo 2011, and Pyšek 2011. The corrected native and exotic richness data could potentially affect previously revealed relationships and their interpretations (a related issue of data quality and comparability in biological invasions has also been raised by Hulme and Weser 2011).…”

Section: Introductionmentioning

confidence: 99%

Geographical, socioeconomic, and ecological determinants of exotic plant naturalization in the United States: insights and updates from improved data

Guo¹,

Rejmánek²,

Wen³

2012

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Previous studies on alien species establishment in the United States and around the world have drastically improved our understanding of the patterns of species naturalization, biological invasions, and underlying mechanisms. Meanwhile, relevant new data have been added and the data quality has significantly increased along with the consistency of related concepts and terminology that are being developed. Here using new and/or improved data on the native and exotic plant richness and many socioeconomic and physical variables at the state level in the United States, we attempt to test whether previously discovered patterns still hold, particularly how native and exotic species are related and what are the dominant factors controlling the plant naturalization. We found that, while the number of native species is largely controlled by natural factors such as area and temperature, exotic species and exotic fraction are predominantly influenced by social factors such as human population. When domestically introduced species were included, several aspects in earlier findings were somewhat altered and additional insights regarding the mechanisms of naturalization could be achieved. With increased data availability, however, a greater challenge ahead appears to be how many and which variables to include in analyses

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Section: Introductionmentioning

confidence: 99%

Geographical, socioeconomic, and ecological determinants of exotic plant naturalization in the United States: insights and updates from improved data

Guo¹,

Rejmánek²,

Wen³

2012

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“…A recent aim in invasion biology has been to synthesise across the accumulated wealth of studies, in order to elucidate any general patterns regarding both causes and consequences of invasions, across species and regions (Blackburn et al 2011, Gurevitch et al 2011. Building generalisations may be hampered by the often very different definitions and measures of invasiveness employed (Guo 2011, Pyšek 2011. Synthesising efforts may therefore benefit from the use of a general measure of invasiveness, which integrates information on invasion success from multiple regions and at multiple scales.…”

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confidence: 99%

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

Dawson¹,

Keser²,

Winter³

et al. 2013

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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

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“…This differentiation is promising as species from both categories can induce severe invasion impacts. At the province scale, the number of non-native species can be underestimated if only species non-native to a larger unit, the whole country, are considered non-native (see Guo 2011, Pyšek 2011. Additional information on the taxonomy, native range, residence time, biological characters, and propagule pressure of non-native plants as well as on invaded habitats would help to reveal traits related to invasiveness and habitat invasibility and might strengthen the use of such lists in early warning approaches (Pyšek et al 2004, Lambdon et al 2008.…”

Section: Lists Of Non-native Species At Regional and National Scalesmentioning

confidence: 99%

Plant invasions in China: an emerging hot topic in invasion science

Liu¹,

Chen²,

Kowarik³

et al. 2012

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China has shown a rapid economic development in recent decades, and several drivers of this change are known to enhance biological invasions, a major cause of biodiversity loss. Here we review the current state of research on plant invasions in China by analyzing papers referenced in the ISI Web of Knowledge. Since 2001, the number of papers has increased exponentially, indicating that plant invasions in China are an emerging hot topic in invasion science. The analyzed papers cover a broad range of methodological approaches and research topics. While more that 250 invasive plant species with negative impacts have been reported from China, only a few species have been considered in more than a handful of papers (in order of decreasing number of references: Spartina alterniflora, Ageratina adenophora, Mikania micrantha, Alternanthera philoxeroides, Solidago canadensis, Eichhornia crassipes). Yet this selection might rather reflect the location of research teams than the most invasive plant species in China. Considering the previous achievements in China found in our analysis research in plant invasions could be expanded by (1) compiling comprehensive lists of non-native plant species at the provincial and national scales and to include species that are native to one part of China but non-native to others in these lists; (2) strengthening pathways studies (primary introduction to the country, secondary releases within the country) to enhance prevention and management; and (3) assessing impacts of invasive species at different spatial scales (habitats, regions) and in relation to conservation resources.

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Knowing what we count: a comment on Guo

Cited by 4 publications

References 23 publications

Geographical, socioeconomic, and ecological determinants of exotic plant naturalization in the United States: insights and updates from improved data

Geographical, socioeconomic, and ecological determinants of exotic plant naturalization in the United States: insights and updates from improved data

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

Plant invasions in China: an emerging hot topic in invasion science

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