Rangeland Ecology & Management
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- Library Collection RecordAn overview of ecological models of grasslands and their research questions is presented. For the purpose of this article, models are regarded as a simplified and formalized representation of…Publication Date 2008
- competition
- disturbance
- Ecosystem modeling
- Grassland dynamics
- grazing
- Optimal life-history strategies
- primary production
- Remote sensing data
- Spatially explicit models
- succession
- modelling
- ecosystem ecology
- community
- vegetation dynamics
- plant production
- southern Africa
- Library Collection RecordThe contribution deals with the contextual design of spatial data for regional development and land management purposes. Further development of information technologies, image processing techniques…Publication Date 2003
- management
- remote sensing
- GIS
- modelling
- southern Africa
- Library Collection RecordUsing new tools (boosted regression trees) in predictive biogeography, with extensive spatial 23 distribution data for >19 000 species, we developed predictive models for South African plant…Publication Date 2006
- modelling
- species richness
- ecosystem ecology
- Alien invasive species
- grasslands
- Africa
- Library Collection Record[1] Land use/cover change has been recognized as a key component in global change. Various land cover data sets, including historically reconstructed, recently observed, and future projected, have…Publication Date 2007
- land use
- climate change
- management
- classification
- data analysis
- remote sensing
- modelling
- rainfall
- Africa
- Library Collection RecordHistorically, agriculturally induced CO2 release from soils has contributed to rising levels in the atmosphere. However, by using appropriate management, soils can be turned into carbon sinks. Many…Publication Date 2007
- carbon sequestration
- drylands
- modelling
- soil carbon
- farming systems
- tropics
- global warming
- carbon dioxide
- management
- subsistence agriculture
- socio-economic aspects
- Africa
- Library Collection RecordAn 18-year time series of monthly NOAA-AVHRR Pathfinder Land burned area was analyzed for the region of tropical Africa, from July 1981 to June 1999. The transition period between NOAA-11 and NOAA-14…Publication Date 2007
- Global burned area
- Southern Oscillation Index
- NOAA-AVHRR Pathfinder Land
- Forecast
- SARIMA
- fire ecology
- NOAA
- modelling
- Africa
- Library Collection RecordEarly warning systems (EWS) tend to focus on the identification of slow onset disasters such famine and epidemic disease. Since hazardous environmental conditions often precede disastrous outcomes by…Publication Date 2006
- Early warning
- Africa
- food security
- NDVI
- precipitation
- rainfall
- Malaria
- Rift valley fever
- Pastoral livelihoods
- modelling
- drought
- management
- system ecology
- Africa
- Library Collection RecordThis paper presents an environmental exposure assessment model for estimating chronic intake of vanadium (a transition metal) by cattle farmed extensively in areas contaminated by vanadium pollutants…Publication Date 2006
- Environmental epidemiology
- Vanadium
- pollution
- cattle
- model
- Transition metals and exposure assessment
- modelling
- Africa
- Library Collection RecordEvidence suggests that C4 grasses, adapted to conditions of low CO2, high temperatures, and water-stressed environments, expanded relatively quickly, and in several geographically distinct regions,…Publication Date 2007
- Oligocene
- Climate modelling
- C4 grasses
- Miocene
- C3 grasses
- palaeobotany
- modelling
- Africa
- Library Collection RecordPlant invasions are a serious threat to natural and semi-natural ecosystems worldwide. Most management-orientated research on invasions focuses on invaders that are already widespread and often have…Publication Date 2007
- biological invasions
- invasive alien plants
- Emerging plant invaders
- Bioclimatic modelling
- Potential distribution
- Alien invasive species
- biodiversity
- landscape ecology
- management
- modelling
- Africa
- Library Collection RecordBiodiversity is a critical component of the natural environment and the protection of it often meant the displacement of local communities in developing countries. The Richtersveld National Park (…Publication Date 2007
- rangelands
- conservation
- Population crashes
- Herd recovery
- goats
- biodiversity
- socio-economic aspects
- national parks
- sheep
- pastoralism
- land use
- Africa
- Library Collection RecordThis paper demonstrates the potential of hyperspectral remote sensing to predict the chemical composition (i.e., nitrogen, phosphorous, calcium, potassium, sodium, and magnesium) of three tree…Publication Date 2007
- hyperspectral
- chemical composition
- reflectance
- Derivative
- Continuum removal
- modelling
- remote sensing
- surface vegetation
- Africa
- Library Collection RecordWe evaluate the possible effects of climate change on vegetation in Central and West Africa. We chose two climate scenarios from the IPCC Third Assessment Report, ECHAM3 with scenario B2 and HADCM3…Publication Date 2008
- vegetation model
- climate change
- Central and West Africa
- modelling
- global warming
- Africa
- Library Collection RecordTraditional vegetative techniques to control gully development rely mainly on the effects of above ground biomass, whereas little attention has been given to the role of below ground biomass. Yet, in…Publication Date 2006
- roots
- grass
- Concentrated flow erosion
- Rill
- Gully
- Erodibility
- soil erosion
- rangelands
- hydrology
- modelling
- Africa
- Library Collection RecordThis paper describes a procedure for evaluating the desertification risk in threatened areas. The procedure is based on an eight-equation dynamic model of a generic human-resource system that can be…Publication Date 2008
- Desertification risk
- System Dynamics
- Alternative long-term states
- desertification
- modelling
- management
- grasslands
- sustainability
- land use
- Africa
- Library Collection RecordThis paper reports on the development and testing of a simulation model to assess the impacts of two seed-feeding biological control agents on the dispersal of an invasive perennial tree, Hakea…Publication Date 2008
- Hakea sericea
- South Africa
- biological control
- population dynamics
- seed dispersal
- Weibull distribution
- fire frequency
- seed banks
- Alien invasive species
- fire
- modelling
- Africa
- Library Collection RecordThe self-thinning line is a very robust pattern, which can be obtained in modeling studies by a variety of different mechanistic assumptions. Our opinion is that we can only advance in our…Publication Date 2008
- Size inequality
- Competitive asymmetry
- Zone of influence model
- Arid savanna
- Acacia reficiens
- Namibia
- Parsimony
- Pattern-oriented modeling
- savanna
- vegetation dynamics
- modelling
- Africa
- Library Collection RecordMany mechanisms have been suggested to explain the coexistence of woody species and grasses in savannas, yet, evidence from field studies and simulation models has been mixed. Shrub encroachment is…Publication Date 2007
- Patch-dynamics
- Cyclical succession
- shrub encroachment
- Spatially explicit root growth
- Computer simulation model
- Validation
- Latin Hypercube sensitivity analysis
- Acacia mellifera
- savanna
- indigenous encroaching species
- vegetation dynamics
- ecosystem ecology
- modelling
- rainfall
- fire
- soil moisture
- Africa
- Library Collection RecordIn arid and semi-arid savannas, species diversity is strongly influenced by structural diversity, which in these systems is characteristically formed by woody vegetation. Shrub encroachment,…Publication Date 2007
- Yellow mongoose
- rangelands
- Individual-based model
- shrub encroachment
- Spatial explicit
- structural diversity
- ecosystem ecology
- savanna
- biodiversity
- mammals
- indigenous encroaching species
- modelling
- Africa
- Library Collection RecordIn semiarid savannas of Southern Africa current land use practices and climate change may lead to substantial changes of vegetation structure in the near future, however uncertainty remains about the…Publication Date 2006
- Acacia erioloba
- Bush encroachment
- global change
- Grewia flava
- overgrazing
- seed dispersal
- shrub encroachment
- Southern Kalahari
- Spatial-explicit simulation model
- savanna
- land use
- grazing
- climate change
- vegetation dynamics
- cattle
- ecosystem ecology
- ecosystem dynamics
- rainfall
- fire ecology
- modelling
- conservation
- management
- carrying capacity
- biodiversity
- indigenous encroaching species
- Africa
- Library Collection RecordClassic rangeland theory advocates stocking rangelands at relatively low and constant levels. This theory has been labelled inappropriate for savanna rangelands, because savannas are strongly…Publication Date 2007
- Bush encroachment
- Disequilibrium theory
- Opportunistic strategies
- Grass-tree interactions
- fire
- livestock production
- savanna
- rangelands
- stocking rates
- management
- modelling
- sustainability
- animal production
- Africa
- Library Collection RecordWater erosion creates negative impacts on agricultural production, infrastructure, and water quality across the world. Regional-scale water erosion assessment is important, but limited by data…Publication Date 2006
- Review
- land degradation
- soil erosion
- remote sensing
- modelling
- Validation
- degradation
- agriculture
- plant production
- animal production
- satellite imagery
- monitoring
- Africa
- Library Collection RecordClimate matching can assist in exploration for biological control agents to control invasive organisms, especially when the native range of the target organism is broad, and control is required in a…Publication Date 2008
- Agent selection
- biological control
- Chromolaena odorata
- climate matching
- CLIMEX
- FloraMap
- Invasive alien species
- modelling
- Alien invasive species
- management
- decision support systems
- Africa
- Library Collection RecordThis series of two papers describes a mechanistic model that simulates within years the productivity of vegetation and livestock on the communal semi-arid rangeland of the Succulent Karoo of South…Publication Date 2007
- semi-arid rangelands
- Mechanistic model
- plant growth
- diet selection
- food intake
- animal productivity
- rangeland condition
- rangelands
- plant production
- animal production
- communal farming
- livestock
- management
- soil moisture
- rainfall
- runoff
- modelling
- Africa
- Library Collection RecordThe worldwide loss of utilisable rangeland in (semi-) arid areas results in huge economic and social costs. Only adaptive management strategies are able to cope with these systems, which are mainly…Publication Date 2007
- Non-equilibrium system
- grazing
- Opportunistic management
- Resting
- semi-arid
- simulation model
- rangeland condition
- rangelands
- modelling
- Economic Aspects
- management
- rainfall
- Africa
- Library Collection RecordPastoral communities in East Africa are facing considerable challenges arising from shifts in land tenure policy from communal to individual landholdings and high human population growth rates. Over…Publication Date 2006
- savanna
- Household model
- Kajiado District
- Subdivision
- policies
- communal farming
- pastoralism
- socio-economic aspects
- household income studies
- modelling
- ecosystem dynamics
- food security
- land use
- land reform
- Africa
- Library Collection RecordLivestock production systems in Africa are experiencing rapid changes in structure and function due to increased demands for livestock products from a more prosperous and ever-increasing human…Publication Date 2008
- Methane
- livestock systems
- Livestock Populations
- climate change
- IPCC
- Africa
- cattle
- sheep
- goats
- greenhouse gases
- Africa
- Library Collection RecordMeeting the challenge of sustainable development requires substantial advances in understanding of the interaction of natural and human systems. The emerging ecosystem management paradigm of multiple…Publication Date 1999
- management
- ecosystem ecology
- modelling
- GIS
- economics
- decision support systems
- Africa
- Library Collection RecordResearch on the effects of ozone on agricultural crops and agro-ecosystems is needed for the development of regional emission reduction strategies, to underpin practical recommendations aiming to…Publication Date 2003
- Tropospheric ozone
- Ozone flux
- Ozone risk assessment
- detoxification
- Antioxidants
- Agricultural crops
- grassland
- climate change
- agriculture
- modelling
- plant production
- ecosystem ecology
- carbon dioxide
- Africa
- Library Collection RecordRiver salination due to dryland agriculture was studied between 1985 and 1986 in the 150-km2 large catchment of the Sandspruit river, a tributary of the Berg river in the semi-arid Western Cape…Publication Date 1995
- agriculture
- hydrology
- rainfall
- modelling
- soils
- Africa
- Library Collection RecordThis study reports on a simulation growth model developed to predict daily gain (DG) of dairy cattle heifers. The model input parameters are gross energy (GE), ash, crude protein (CP), organic matter…Publication Date 2011
- elephant grass
- Daily Gain
- Supplement
- desmodium
- lablab
- Dairy cattle
- diet selection
- modelling
- Uganda
- Africa
- Library Collection RecordThis study examined intraspecific variation in mineral composition and rumen degradability of Atriplex nummularia plants and the influence on selection preferences of sheep. Individual plants were…Publication Date 2009
- forage quality
- in situ degradability
- intraspecific variation
- salt bush
- sheep
- nutrition
- diet selection
- forage quality
- South Africa
- Library Collection RecordPrimary energy extraction patterns by livestock under agropastoralism and ranching were investigated by the bite count method in semiarid south-eastern Kenya. Sward biomass for optimal energy intake…Publication Date 2009
- agropastoralism
- energy intake
- ranching
- livestock
- cattle
- sheep
- goats
- pastoralism
- diet selection
- grazing
- management
- animal production
- Kenya
- Africa
- Library Collection RecordThe nutritive value of four subtropical grasses (Panicum maximum, Anthephora pubescens, Digitaria eriantha and Chloris gayana) standing hay were compared in terms of qualitative intake and partial…Publication Date 2009
- Anthephora pubescens
- Chloris gayana
- Digitaria eriantha
- nutritive value
- Panicum maximum
- diet selection
- sheep
- forage quality
- animal nutrition
- grazing
- South Africa
- Library Collection RecordBrowsing herbivores are generally highly selective feeders, selecting for new shoots and young plant material. Determinations of browser carrying capacity are then greatly inflated when based on…Publication Date 2014
- savanna
- browsing
- grazing
- game
- wildlife
- conservation
- carrying capacity
- climate
- soil
- rainfall
- modelling
- plant production
- management
- Zululand region
- KwaZulu-Natal
- South Africa
- Library Collection RecordMany of the intransigent problems facing the world arise in complex systems. In this paper, I propose that communal rangelands in South Africa be recognised as complex social-ecological systems and…Publication Date 2013
- communal farming
- rangelands
- socio-economic aspects
- Sustainable development
- climate change
- policy
- management
- modelling
- subsistence agriculture
- South Africa
- Library Collection RecordFicus thonningii is a multipurpose browse tree in northern Ethiopia. Despite its importance, techniques for quantifying its browsable biomass have not been developed. To develop best-estimation…Publication Date 2012
- allometry
- indigenous fodder trees
- Tigray
- modelling
- plant production
- forage quality
- foraging ecology
- North Africa
- Ethiopia
- Library Collection RecordPredicting the effect of different management strategies on range condition is a challenge for farmers in highly variable environments. A model that explains how the relations between rainfall,…Publication Date 2010
- catastrophe theory
- complexity theory
- Disequilibrium
- hysteresis
- moving attractors
- vegetation dynamics
- livestock
- rainfall
- rangelands
- mangement
- rangeland condition
- modelling
- ecosystem ecology
- stocking rate
- South Africa
- Library Collection RecordThe reliability of a field test kit for the detection and the persistence of Synergistes jonesii bacteria in sheep was investigated in two trials for 12 months. The test kit consisted of a culture…Publication Date 2010
- DHP-degrading bacteria
- dihydroxypyridine
- mimosine
- diagnostic kits
- sheep
- drought
- forage quality
- disease
- South Africa
- Library Collection RecordSeed ecology may play a role in the widespread increase of Acacia karroo in savanna and grassland. Accordingly, fecundity, predation, mortality by fire, dispersal by livestock, and seed longevity…Publication Date 2010
- dispersal
- fire
- seed bank
- seed lngevity
- seed predation
- seed production
- ecology
- savanna
- grassland
- livestock
- insects
- germination
- cattle
- sheep
- goats
- management
- Eastern Cape
- South Africa
- Library Collection RecordThe relative benefit of different grazing management practices for maintaining grassland biodiversity integrity was assessed. Practices considered were grazing system, stocking rate, animal type,…Publication Date 2010
- analytic heirarchy process
- plant diversity
- stocking rate
- veld condition assessment
- grazing
- management
- biodiversity
- fire
- cattle
- sheep
- Impact assessment
- South Africa
- Library Collection RecordCommunal rangelands have a wide range of vegetation communities that sustain livestock. Limited information exists on forage availability and quality in communal areas and how it influences Nguni…Publication Date 2010
- biomass
- bite size
- foraging behaviour
- Nguni
- communal farming
- livestock
- sheep
- KwaZulu-Natal
- South Africa
- Library Collection RecordSinking boreholes to tap groundwater supplies facilitated expansion of all-year round livestock production into the semi-arid Kalahari. Increased grazing and trampling pres sure around the boreholes…Publication Date 1997
- agriculture
- piosphere
- grazing
- grasslands
- soil erosion
- Soil Condition
- cattle
- watering points
- rainfall
- modelling
- Africa
- Library Collection RecordIn spite of a manager's best attempts, a managed rangeland may hit an irreversible state in which it provides neither consumptive nor nonconsumptive services to humans. Therefore, given a…Publication Date 2005
- Irreversible state
- Markov chain
- range management
- uncertainty
- rangelands
- management
- rangeland condition
- modelling
- Africa
- Library Collection RecordAbstract. Shrub encroachment, i.e. the increase in woody plant cover, is a major concern for livestock farming in southern Kalahari savannas. We developed a grid-based computer model simulating the…Publication Date 2004
- Acacia erioloba
- browsing
- Bush encroachment
- Savanna dynamics
- shrub invasion
- Spatial-explicit simulation model
- indigenous encroaching species
- modelling
- rangelands
- livestock
- savanna
- cattle
- fire ecology
- shrub encroachment
- stocking rates
- Africa
- Library Collection RecordIncreasing evidence shows that anthropogenic climate change is affecting biodiversity. Reducing or stabilizing greenhouse gas emissions may slow global warming, but past emissions will continue to…Publication Date 2010
- biodiversity hotspot
- climate change risk assessment
- Mediterranean type ecosystem
- species distribution modelling
- modelling
- climate change
- biodiversity
- greenhouse gases
- conservation
- rainfall
- South Africa
- Library Collection Record1. Ecologists debate the importance of neutral versus niche-based explanations for patterns of species coexistence and whether small-scale data can inform ecological understanding of communities,…Publication Date 2011
- community analysis
- ecosystem ecology
- rainfall
- soil nutrients
- modelling
- abiotic gradients
- community assembly theory
- environmental filters
- grass phylogeny
- K-statistic
- plant population and community dynamics
- plant species richness
- species coexistence
- structural equation modelling
- trait dispersion
- Tanzania
- Africa
- Library Collection RecordAbstract Recent IPCC projections suggest that Africa will be subject to particularly severe changes in atmospheric conditions. How the vegetation of Africa and particularly the grassland-savanna-…Publication Date 2009
- adaptive vegetation modelling
- aDGVM
- climate change
- demographic model
- DGVM
- fire
- process-based model
- savanna
- vegetation distribution
- grasslands
- modelling
- fire ecology
- disturbance
- carbon dioxide
- ecosystem ecology
- Africa
- Library Collection RecordAbstract Carbon sequestration programs, including afforestation and reforestation, are gaining attention globally and will alter many ecosystem processes, including water yield. Some previous…Publication Date 2005
- afforestation
- land-use change
- plantation
- runoff
- water yield
- carbon sequestration
- ecosystem dynamics
- modelling
- grasslands
- rainfall
- hydrology
- Africa
- Library Collection RecordPredicting the probability of successful establishment of plant species by matching climatic variables has considerable potential for incorporation in early warning systems for the management of…Publication Date 2005
- Bioclimatic modelling
- biological invasions
- exotic species
- Invasive alien species
- plant invasions
- prediction
- propagule pressure
- risk assessment
- management
- Alien invasive species
- hazard assessment
- modelling
- biodiversity
- mapping
- climate
- ecosystems
- Africa