• Publications
  • Influence
Mound building termites contribute to savanna vegetation heterogeneity
It is indicated that graminoid herb richness peaks at lower productivity levels than trees and forbs in savanna ecosystems, as also recently found in temperate areas. Expand
Land-use/cover dynamics in Northern Afar rangelands, Ethiopia
This study uses a combination of remote sensing data, field observations and information from local people to analyze the patterns and dynamics of land-use/cover changes for 35 years from 1972 toExpand
Vegetation changes during a 36‐year period in northern Chobe National Park, Botswana
A significant decrease in browse use is found with increasing distance to the Chobe river for Combretum apiculatum,combretum elaeagnoides, combretum mossambicense and other woody plants combined, and there is no change in the density of any of the shrubs. Expand
The effects of exclosures in restoring degraded semi-arid vegetation in communal grazing lands in northern Ethiopia.
Rangeland degradation is a widespread problem throughout sub Saharan Africa and its restoration is a challenge for the management of many semi-arid areas. This study assessed the effectiveness ofExpand
Plant functional traits mediate reproductive phenology and success in response to experimental warming and snow addition in Tibet.
It is found that warming delayed the reproductive phenology and decreased number of inflorescences of Kobresia pygmaea C. B. Clarke, a shallow-rooted, early-flowering plant, which may be mainly constrained by upper-soil moisture availability. Expand
The Return of the Giants: Ecological Effects of an Increasing Elephant Population
Investigating the interactions between the increasing elephant population and other ecosystem components and processes in northern Botswana confirms that the ecosystem is changing following the increase in elephant and ungulate populations, and developing towards a situation resembling that before the reduction of large herbivores. Expand
What controls woodland regeneration after elephants have killed the big trees
Various seedling predators, including the ubiquitous impala Aepyceros melampus, regulate the regeneration of trees from seedlings, and the hypothesis that tall closed-canopy woodlands originate during episodic windows of opportunity for seedling survival is supported. Expand
Termitaria as browsing hotspots for African megaherbivores in miombo woodland
It is proposed that termite mound construction in miombo woodland contributes to sustaining populations of megaherbivores and perhaps some woody species in these areas. Expand
Pastoralists and livelihoods: A case study from northern Afar, Ethiopia
Abstract The changing contexts in the drylands of Africa in which pastoralists operate pose potential negative effects for the livelihood sustenance of pastoralists. We examined present livelihoodExpand
Home Gardens Sustain Crop Diversity and Improve Farm Resilience in Candelaria Loxicha, Oaxaca, Mexico
Home gardens are land use units embedded in a larger land use system, in this case in Candelaria Loxicha, Oaxaca, Mexico. Using a combination of qualitative and quantitative methods, we investigatedExpand