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Environmental and anthropogenic determinants of the spread of alien plant species: insights from South Africa’s quaternary catchments

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Abstract

Alien plants invasion has negative impacts on the structure and functionality of ecosystems. Understanding the determinants of this process is fundamental for addressing environmental issues, such as the water availability in South Africa’s catchments. Both environmental and anthropogenic factors determine the invasion of alien species; however, their relative importance has to be quantified. The aim of this paper was to estimate the importance of 32 explanatory variables in predicting the distribution of the major invasive alien plant species (IAPS) of South Africa, through the use of Species Distribution Models. We used data from the National Invasive Alien Plants Survey, delineated at a quaternary catchment level, coupled with climatic, land cover, edaphic, and anthropogenic variables. Using two-part generalized linear models, we compared the accuracy of two different sets of variables in predicting the spatial distribution of IAPS; the first included environmental correlates alone, and the second included both environmental and anthropogenic variables. Using Random Forest, we explored the relative importance of the variables in producing a map of potential distribution of IAPS. Results showed that the inclusion of anthropogenic variables did not significantly improve model predictions. The most important variables influencing the distribution of IAPS appeared to be the climatic ones. The modeled potential distribution was analyzed in relation to provinces, biomes, and species’ minimum residence time.

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Acknowledgements

This study was supported by SECOSUD II Project funded by the Italian Agency for Development Cooperation. We are also grateful to Laura Clarke for revising the text.

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Authors and Affiliations

  1. Department of Environmental Biology, Sapienza University of Rome, Rome, Italy

    Dilva Terzano, Silvio Cianciullo, Paolo Caroli, Luca Malatesta & Fabio Attorre

  2. ARC-Institute for Soil, Climate and Water, Stellenbosch, South Africa

    Ian Kotzé

  3. Department of Environmental Affairs, Natural Resource Management Programmes, Cape Town, South Africa

    Christo Marais

  4. Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy

    Alessio Farcomeni

Authors
  1. Dilva Terzano
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  2. Ian Kotzé
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Correspondence to Dilva Terzano.

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Communicated by Peter Minchin.

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Terzano, D., Kotzé, I., Marais, C. et al. Environmental and anthropogenic determinants of the spread of alien plant species: insights from South Africa’s quaternary catchments. Plant Ecol 219, 277–297 (2018). https://doi.org/10.1007/s11258-018-0795-5

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