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Do we understand the causes of bush encroachment in African savannas?
- D. Ward
- Environmental Science
- 1 July 2005
Bush encroachment affects the agricultural productivity and biodiversity of 10–20 million ha of South Africa. Many people believe that we understand the causes of bush encroachment. We do not. Many…
A patch-dynamics approach to savanna dynamics and woody plant encroachment – Insights from an arid savanna
Large Mammalian Herbivores and the Conservation of Arid Acacia Stands in the Middle East
It is concluded that large mammalian herbivores are essential components of arid Acacia savannas and that wild and domestic ungulates must be included in future conservation plans.
Land degradation is not a necessary outcome of communal pastoralism in arid Namibia
- D. Ward, Ben T. Ngairorue, Johannes N. Kathena, R. Samuels, Y. Ofran
- Environmental Science
- 1 December 1998
Abstract In Otjimbingwe, a region of arid south-central Namibia, human population densities are high and these communal pastoralists own large numbers of livestock. Such situations are commonly…
Walter’s two-layer hypothesis revisited: back to the roots!
It is found that, within the scope of Walter’s original intentions, this hypothesis works remarkably well, and in some cases is appropriate for deserts as well as for dry temperate systems and even some mesic savannas.
Multi-scale patterns and bush encroachment in an arid savanna with a shallow soil layer
Abstract Question: Bush encroachment (i.e. an increase in density of woody plants often unpalatable to domestic livestock) is a serious problem in many savannas and threatens the livelihood of many…
Soil quality gradients around water-points under different management systems in a semi-arid savanna, South Africa
Anthropogenic causes of high mortality and low recruitment in three Acacia tree taxa in the Negev desert, Israel
It is found that the major probable cause of mortality was the absence of culverts under roads cross-cutting the ephemeral river beds where the Acacias are mostly found, and an average of five species of perennial plants disappeared downstream from the roads.
Additions to, and a review of, the Miocene shark and ray fauna of Malta
Bulk sampling sediments and surface picking have increased the number of fossil sharks and rays from the Miocene of the Maltese Islands by 10 species and confirmed another. These are: Sphyrna…
A comparison of the effects of different rangeland management systems on plant species composition, diversity and vegetation structure in a semi-arid savanna
Most of South Africa's land surface is arid or semi-arid rangeland. Three management systems exploit these areas: commercial livestock ranching, communal livestock ranching and game ranching. The…