Changing Biomes in South Africa
Predictions of the effects of climate change on natural ecosystems in South Africa, over the medium to long term, have included reduced spatial extent of the Grassland biome (Ellery et al. 1991) and an increase in the extent of the Desert biome (Macdonald & Midgley 1996). This graphic shows how the Grassland Biome is expected to shrink as surrounding biomes expand their ranges. It also shows how increasingly arid conditions in the Northern Cape r...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
The vicious cycle of depletion
Agricultural systems in the temperate zone tend to occupy
fertile soils that would have formerly supported temperate
grassland or forest. Land clearance for croplands and pasture
has greatly reduced above ground carbon stocks from their
original state and soil carbon stocks are also often depleted as tillage disrupts the soil, opening it to decomposer organisms
and generating aerobic conditions that stimulate respiration
and release of carb...
27 May 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Emissions of the Brazilian Amazon
Brazil has been recognized as the fifth highest emitter of greenhouse gasses in the world, and is also the highest emitter within the Latin American and Caribbean region. This high level of emission is first and foremost due land use changes within the country. In 2005, forest and grassland conversion was responsible for emitting more than one billion of metric tons of CO2 equivalent (MtCO2-e) in the Brazilian Amazon.
22 Nov 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Migration of grassland birds in America
The grasslands of Argentina, Bolivia, Brazil, Paraguay, and Uruguay in southern South America represent important habitat to numerous migratory and resident bird species. These birds play vital roles in the ecosystem by dispersing seeds and controlling insect populations. Some species, such as the Buff-breasted Sandpiper (Tryngites subruficollis), migrate some 20,000 km from their breeding grounds along the Arctic coast to their non-breeding rang...
15 Nov 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal