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Clearing invasive alien plant species Clearing invasive alien plant species
Despite the widespread distribution and extent of alien invasive species in South Africa, actions to control such plants have had some good results. In the fight against invasive alien plant species, the Working for Water programme has used various methods including mechanical methods, chemical methods, biological control, and integrated control.
21 Jun 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Invasive alien plant species potential distribution Invasive alien plant species potential distribution
Alien plant species pose a major threat to South Africa’s native biodiversity. It is estimated that more than 9 000 plant species have been introduced so far. Of these, about 198 species are deemed invasive, covering 10 per cent of the country. Since the invasive plants grow by an estimated 5 per cent a year, their presence has dramatic effects on both native species and ecosystems as well as economic activities in the area. In particular, alien ...
21 Jun 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Biodiversity threats Biodiversity threats
South Africa is recognised as the third most megadiverse country in the world. The abundance of biodiversity found within its borders covers an estimated ten per cent of the world’s plant species, seven per cent of all bird, six per cent of all mammal, and five per cent of all reptile species found on the planet. Due to various causes ranging from unsustainable land use and farming practices, to invasion by alien species and climate change, So...
21 Jun 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Carbon storage in terrestrial ecosystems vs. great ape distribution Carbon storage in terrestrial ecosystems vs. great ape distribution
All great ape species predominantly live in tropical rainforests, which are among the most carbon-rich areas in the world. This overlap between the areas where great apes occur and carbon indicates that more potential synergies between great apes and carbon conservation exist.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Land cover change in Batang Toru Land cover change in Batang Toru
Migration from the island of Nias to the West Batang Toru forests over the last two decades has been largely spontaneous. These settlers have opened up primary forests for agriculture and hunt many species of local wildlife, including orangutans. Currently at least eight Nias communities have been established inside the protected forest in the Batang Toru area, leading to the loss of more than 2,200 ha of orangutan forest habitat in specifically ...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Forest loss from 1985-2007 for Sumatra Forest loss from 1985-2007 for Sumatra
If only the most important orangutan habitat is examined – i.e. forest below 1,000 m – for the 1985-2007 period, the rate of loss was even higher, at 28% and 49% for Aceh and North Sumatra respectively. When only the most species-rich forests (below 500 m) are considered, forest loss between 1985 and 2007 was 36% for Aceh and 61% for North Sumatra. For the carbon-rich peat swamp forests the loss was 33% for Aceh and 78% for North Sumatra.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Administration Administration
Sumatran orangutan habitat overlaps 2 Provinces and 21 Districts, presenting many challenges for integrated development policies. 78% of the species’ present range lies within Aceh, and the remaining 22% in North Sumatra. A total of 13 districts in Aceh, and eight in North Sumatra, contain forests where wild Sumatran orangutans still occur.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Megafauna Megafauna
Forests that support Sumatran orangutans also harbour high numbers of other animal and plant species, including some of the most emblematic megafauna species in the world, the Sumatran tiger (Panthera tigris sumatrae), Sumatran elephant (Elephas maximus sumatranus) and Sumatran rhinoceros (Dicerorhinus sumatrensis).
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Saiga Antelope populations Saiga Antelope populations
The Saiga Antelope is a migratory herbivore of the steppes and deserts of Central Asia and Russia, capable of travelling hundreds of kilometres north to south on its annual migrations. Saigas have been hunted since prehistoric times and today poaching remains the primary threat to this critically endangered species. Following the collapse of the Soviet Union, Saiga populations crashed by more than 95% within a decade. While a number of Saiga po...
15 Nov 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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