Abstract
V. Rolo and P.I. Olivier are supported by post-doctoral grants from the National Research Foundation (NRF) of South Africa. This work was also partly funded by an Ecologists in Africa grant by the British Ecological Society to P.I. Olivier. R.J. van Aarde is supported by Richards Bay Minerals, NRF and the Technology and Human Resources for Industry Programme (THRIP). M. Pfeifer was supported by European Research Council Project number 281986.
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