Urban Ecosystems

, Volume 18, Issue 3, pp 1021–1030 | Cite as

The role of roads and urban area in occurrence of an ornamental invasive weed: a case of Rudbeckia laciniata L

  • Munemitsu Akasaka
  • Takeshi Osawa
  • Makihiko Ikegami
Article

Abstract

Road density and proportion of urban area are considered to be useful indicators of invasion risk from non-native plants. However, the mechanisms behind the relationship between these indicators and establishment of non-native species have rarely been addressed explicitly. To identify these mechanisms, we used a species distribution model (MaxEnt) for an invasive ornamental weed Rudbeckia laciniata using road density and proportion of urban area as explanatory variables, along with soil moisture and solar radiation. Overall model performance is relatively high (AUC = 0.91). Road density explained most R. laciniata occurrence, followed by the proportion of urban area. The occurrence probability of R. laciniata increased monotonically with road density, but the rates of increase constantly fell. The occurrence probability also increased with urban area when the proportion of urban area was small, but started to decrease when the proportion of urban area reached 0.2. Our results suggest that both road density and proportion of urban area are important factors in determining R. laciniata establishment but work differently.

Keywords

Biological invasion Distribution Landscape planning National park Risk management 

Notes

Acknowledgments

We thank A. Tsujimoto and N. Kozuma for help conducting the field census and Joseph Bennett for his comments on the manuscript.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Munemitsu Akasaka
    • 1
    • 2
  • Takeshi Osawa
    • 3
  • Makihiko Ikegami
    • 4
  1. 1.Institute of AgricultureTokyo University of Agriculture and TechnologyFuchuJapan
  2. 2.School of Biological SciencesThe University of QueenslandQueenslandAustralia
  3. 3.National Institute for Agro-Environmental ScienceTsukubaJapan
  4. 4.The Bio-Protection Research CentreLincoln UniversityCanterburyNew Zealand

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