Social-ecological tipping points in the rangeland system in the Waterberg Region in Namibia
Drylands are well-known for regime shifts, where small shifts in human pressures and/or environmental conditions bring about abrupt changes towards alternative states. One major type of regime shifts in drylands occurs at a 'Desertification Tipping Point' (DTP). Crossing a DTP is assumed to be triggered by a combination of several drivers, with climate change (mainly droughts) and land-use change (mainly overgrazing) as the most important. It leads to a reduction or loss of the critical ecosystem service 'forage provision', with direct impacts on people's livelihoods and well-being Research gap: literature on ecological tipping points (TP) is well established and on social TPs is increasing, while studies focussing on the interlinked social-ecological perspectives of TPs are scarce. Objective: to study social-ecological TPs in a rangeland system subjected to climate change in order to identify state changes with limited reversibility towards degradation in several cascades triggered by positive feedback loops running through the ecological and the social subsystem. Study Region: Namibia: Greater Waterberg Landscape Region, 250 km north of Windhoek; Semi-arid climate: 350-400 mm/a, dry season May-Oct, rainy season Nov-Apr; Dual land tenure system: freehold land and communal land incl. communal conservancies; Farming types: cattle farming, guest/hunting farms, mixed farming; Rainfall is an unreliable source of water for livestock, leading to dependency on groundwater resources.
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| Social_ecological tipping points in the rangeland system in Waterberg Region in Namibia.pdf | 1.48 MB |