Spear, D. and Foxcroft, L.C. and Bezuidenhout, H. and McGeoch, M.A. (2013) Human population density explains alien species richness in protected areas. Biological Conservation, 159. pp. 137-147.
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Abstract
Understanding the drivers of biological invasions, across taxa and regions, is important for designing appropriate management interventions. However there has been no work that has examined potential drivers of both plant and animal invasions, for both species considered to be aliens and those that are invasive. We use South Africa’s national park system (19 national parks, throughout South Africa and covering ∼39,000 km2) as a model to test the generality of predictors of alien species richness in protected areas. We also compare the predictors of alien versus invasive species richness, and alien plant versus alien animal species richness. Species were classified as alien, invasive (having known negative impact on biodiversity) or extralimital, using standard definitions. Potential predictors (numbers of years since the park was proclaimed and since new land was acquired, park area, data availability, human population density in the vicinity of the park, number of roads, number of rivers, indigenous plant species richness and normalised difference vegetation index) of the number of alien and invasive species in national parks were examined for plants and animals using generalised linear models. Human population density surrounding parks was a significant and strong predictor of numbers of alien and invasive species across plants and animals. The role of other predictors, such as NDVI and park age, was inconsistent across models. Human population density has emerged here as an important predictor of alien species richness in protected areas across taxa, providing a basis for guidelines on where to focus surveillance and eradication efforts.
| Item Type: | Article |
|---|---|
| Additional Information: | This research was funded by the DST-NRF Centre of Excellence for Invasion Biology and the Global Invasive Species Programme |
| Uncontrolled Keywords: | Alien mammals; Alien plants; Biological invasions; Extralimital species; Non-native species; Protected area management |
| Author Affiliation: | Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa |
| Subjects: | Statistics and Experimentation Environmental Science |
| Divisions: | General |
| Depositing User: | Mr Balakrishna Garadasu |
| Date Deposited: | 25 May 2013 13:53 |
| Last Modified: | 25 May 2013 13:53 |
| Official URL: | http://dx.doi.org/10.1016/j.biocon.2012.11.022 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/10590 |
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