Elephant-mediated cascading effects of water point closure in Kruger National Park

J. Hilbers, W.F. de Boer, F. van Langevelde, H.H.T. Prins, R. Grant, H.J. de Knegt, M. Peel, M.B. Coughenour, I. Smit, G. Kiker

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

The high density of African elephants in Kruger National Park (KNP), South Africa, is a concern for management because of their destructive effect on the vegetation. Construction or removal of artificial water points has been suggested to influence the densities and distribution of elephants and hence their effects on the vegetation. In this study we examined the long-term effects of different scenarios of water point closure in KNP on the spatial distribution of elephants and calculated the effects on the vegetation and other herbivores. Using a dynamic ecosystem model, SAVANNA, several scenarios were evaluated that varied in (1) decreases in availability and spatial arrangement of artificial WPs according to current and future policies, (2) different levels of natural water availability to investigate the effects of wet and dry years, and (3) different densities of elephants. Our results showed that elephants indirectly negatively affected the distributions of mesomixed feeders, mesobrowsers and some mesograzers under very wet and intermediately wet scenarios. Furthermore, the closure of water points only had an impact on the ecosystem during drought years, resulting in increased densities of all herbivores, except for giraffe and steenbok, in areas close to rivers. The spatial distributions of elephant bulls and breeding herds were less affected by the closure of water points than most of the other herbivore species. The future closure of almost half of the water points to allow vegetation and animal distribution patterns to recover and to increase heterogeneity is expected to have little effect.
Original languageEnglish
Title of host publicationProceedings of the 12th Savanna Science Network Meeting, Kruger National Park
PublisherSANPark's Scientific Services
Pages19-19
Publication statusPublished - 2014
Event12th Savanna Science Network Meeting, Skukuza, South Africa -
Duration: 10 Mar 201414 Mar 2014

Conference

Conference12th Savanna Science Network Meeting, Skukuza, South Africa
Period10/03/1414/03/14

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Hilbers, J., de Boer, W. F., van Langevelde, F., Prins, H. H. T., Grant, R., de Knegt, H. J., ... Kiker, G. (2014). Elephant-mediated cascading effects of water point closure in Kruger National Park. In Proceedings of the 12th Savanna Science Network Meeting, Kruger National Park (pp. 19-19). SANPark's Scientific Services.