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Hunting of orangutans Hunting of orangutans
Orangutans are also still regularly killed or captured. This occurs for three main reasons: first, even today some people still hunt orangutans for food, most notably in the non-Muslim parts of North Sumatra. Second, when orangutans enter farms or plantations at the for-est edge, for example to feed on fruit trees or other crops, they are often shot or otherwise killed, and any surviving infant eventually ends up in trade or as someone’s illegal ...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Change in forest cover, 1985-2007 Change in forest cover, 1985-2007
Between 1985 and 2007, 49.3% of all forests on the island were lost. In the provinces of Aceh and North Sumatra the figures were 22.7% and 43.4%, respectively. Most forest loss has occurred in the lowlands, the very areas where orangutan density is highest.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Carbon stock for different type of land uses, on mineral and peat soil Carbon stock for different type of land uses, on mineral and peat soil
For a range of land uses that occur in Tripa (forests on peatland) and Batang Toru (forest on non-peatland) the profitability and carbon stocks were determined. Undisturbed forest clearly has the highest carbon stock while rice fields have the lowest.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Ecological zones Ecological zones
Sumatran orangutans occur in two main forest habitats, those on dryland mineral soils and those on wet coastal peat. The three main peat areas are Singkil, Kluet and Tripa on the west coast of Aceh province.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Land use types that replaced forest in the Leuser Ecosystem during 1985-2007 Land use types that replaced forest in the Leuser Ecosystem during 1985-2007
The main driver for forest loss on peat areas in the Leuser Ecosystem was oil palm development between 1985 and 2007, while for forest on non-peatlands other land uses than oil palm contributed more to land use changes.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Land cover change in Tripa, Indonesia Land cover change in Tripa, Indonesia
In the Tripa peat swamps, companies are operating seven large concessions of between 3,000 and 13,000 hectares. They are converting the remaining forests on peatlands into oil palm plantations. The concessions cover more than 75 percent of Tripa’s total area of 62,000 hectares. While almost certainly hosting as many as 1,000 orangutans or more in the early 1990s, when still covered in pristine peat swamp forest, there are thought to be less than ...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Lesser White-fronted Goose migratory routes in Eurasiah Lesser White-fronted Goose migratory routes in Eurasiah
The globally threatened Lesser White-fronted Goose is a Palearctic migrant, breeding discontinuously in forest- or shrub tundra and mountainous shrubby wetlands from Fennoscandia to easternmost Russia. The species has declined rapidly since the 1950s leading to a fragmentation of its breeding range. Many key stop-over and wintering sites are still unknown. Today, three distinct wild sub-populations remain, of which the two Western Palearc...
15 Nov 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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