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Managing Urban Plant Invasions: a Multi-Criteria Prioritization Approach

  • Luke J. Potgieter
  • Mirijam Gaertner
  • Ulrike M. Irlich
  • Patrick J. O’Farrell
  • Louise Stafford
  • Hannah Vogt
  • David M. Richardson
Article
  • 49 Downloads

Abstract

Alien plant invasions in urban areas can have considerable impact on biodiversity and ecosystem services (ES). Managing urban plant invasions is particularly challenging given the complex interactions between ecological, economic and social elements that exist in the urban milieu. Strategic landscape-scale insights are crucial for guiding management, as are tactical site-scale perspectives to plan and coordinate control efforts on the ground. Integrating these requirements to enhance management efficiency is a major challenge. Decision-support models have considerable potential for guiding and informing management strategies when problems are complex. This study uses multi-criteria decision tools to develop a prioritization framework for managing invasive alien plants (IAPs) in urban areas at landscape and local scales. We used the Analytic Hierarchy Process (AHP; a multi-criteria decision support model) to develop and rank criteria for prioritising IAP management in the City of Cape Town (CoCT), South Africa. Located within a global biodiversity hotspot, Cape Town has a long history of alien plant introductions and a complex socio-political make-up, creating a useful system to explore the challenges associated with managing urban plant invasions. To guide the prioritization of areas for IAP management across the CoCT, a stakeholder workshop was held to identify a goal and criteria for consideration, and to assess the relative importance given to each criterion in IAP management. Workshop attendees were drawn from multiple disciplines involved with different aspects of IAP research and management: government departments, scientists and researchers, and managers with a diverse set of skills and interests. We selected spatial datasets and applied our multi-criteria decision analysis in a Geographic Information System (GIS) to develop a landscape-scale prioritization map. To address issues relevant in an urban setting, we also modified an existing IAP management framework to develop a tactical (site-level) prioritization scheme for guiding on-the-ground control operations. High-priority sites for IAP management were identified at landscape- and local scales across the study area. Factors related to safety and security emerged as pivotal features for setting spatially-explicit priorities for management. The approach applied in this study can be useful for managers in all urban settings to guide the selection and prioritization of areas for IAP management.

Keywords

Biological invasions Ecosystem services Invasive alien plants Multi-criteria analysis Prioritization Urban ecosystems 

Notes

Acknowledgements

Invited stakeholders for the prioritisation workshop were: David Le Maitre (CSIR), Brian van Wilgen (Centre for Invasion Biology), Nicola van Wilgen (SANParks), Greg Forsyth (CSIR), Patricia Holmes (City of Cape Town), Luca Afonso (Centre for Invasion Biology), Chandre Rhoda (City of Cape Town), Chad Cheney (SANParks), Karen Esler (Centre for Invasion Biology) and Leighan Mossop (City of Cape Town). Funding for this work was provided by the DST-NRF Centre of Excellence for Invasion Biology and the Working for Water Programme through their collaborative research project on “Integrated Management of invasive alien species in South Africa” and the National Research Foundation (grant 85417 to DMR). We thank the City of Cape Town (City Maps and Invasive Species Unit) and SANBI (BGIS) for access to spatial data.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

267_2018_1088_MOESM1_ESM.docx (98 kb)
Supplementary Information

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Luke J. Potgieter
    • 1
  • Mirijam Gaertner
    • 1
    • 2
  • Ulrike M. Irlich
    • 1
    • 3
  • Patrick J. O’Farrell
    • 4
    • 5
  • Louise Stafford
    • 3
  • Hannah Vogt
    • 3
  • David M. Richardson
    • 1
  1. 1.Centre for Invasion Biology, Department of Botany and ZoologyStellenbosch UniversityMatielandSouth Africa
  2. 2.Nürtingen-Geislingen University of Applied Sciences (HFWU)NürtingenGermany
  3. 3.Invasive Species Unit, Environmental Resource Management Department, City of Cape TownWestlake Conservation OfficeCape TownSouth Africa
  4. 4.Natural Resources and Environment CSIRStellenboschSouth Africa
  5. 5.Percy FitzPatrick Institute of African OrnithologyUniversity of Cape TownRondeboschSouth Africa

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