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Land use values
The area where orangutans occur can be separated into two main habitat types: forest on peat-lands (Tripa) and forests on mineral soils (Batang Toru),…
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Plantation concessions
Oil palm plantations depend on the microclimate conditions generated by nearby forests, and the rivers emanating from orangutan habitat. Not all plantations concessions on…
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Roads
Roads, both existing and planned, are a major threat to Sumatran orangutans as they increasingly fragment populations, making them more vulnerable and less viable.…
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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…
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Ecosystem services value for the Leuser Ecosystem
Values for the various non-carbon ecosystem services (water, regulation of floods and landslides, fisheries, prevention and limitation of fires, agriculture, tourism, and non-timber forest…
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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…
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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…
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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…
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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…
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Sites
Sumatran orangutan habitat is restricted to the westernmost tip of Indonesia. Boxes indicate the case study areas Tripa and Batang Toru. The case of…
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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…
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Forest status
Most Sumatran orangutan habitat is protected by Indonesian law. The government has created a very comprehensive system of functional forest categories, and institutions responsible…