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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,…
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Water catchments
Orangutan habitat overlaps the catchments of 44 major rivers in Sumatra, each of which reaches the coast and discharges into the sea. Thus it…
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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…
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Population growth in North Sumatra and Aceh 1920-2008
Overall population growth in the region has been very rapid during the past nine decades. In 1920, the human populations of Aceh and North…
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Conversion of forests to different land uses
Using satellite images, land use changes were determined at Batang Toru (2001-2009) and Tripa (2001-2009) to calculate overall CO2 emissions. Deforestation in both areas…
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Smuggling routes of illegally logged ramin timber from Indonesia, including from national parks and protected areas
Illegal transport and organization of illegal logging by syndicates. Much of the timber is re-sold during transport and thus changes ownership en route, obliterating…
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Below-ground carbon stocks
The three coastal peat swamps of Tripa, Kluet and Singkil together represent the most important habitat for Sumatran orangutan populations in terms of density…
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Mining exploration
The mining industry is a potential threat to Sumatran orangutan habitat in a number of important areas, both directly by its own activities and…
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Annual rainfall
Sumatran orangutans live in lowland tropical rainforests, with precipitation normally between 1,680 mm and 4,070 mm annually. Western regions receive much more rain than…
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Above-ground carbon stocks
Some of the richest above-ground carbon stocks are found in forests occupied by Sumatran orangutans. The total carbon stored in the above-ground woody biomass…
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Tourism
Sumatran orangutan habitat offers excellent opportunities for tourism, including direct viewing of orangutans and other diverse wildlife, jungle treks and caving, rafting and bathing…
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Above-ground carbon-stock density changes
In Batang Toru, land use changes and deforestation led to an overall loss of around 10 tonnes of carbon per hectare between 1994 and…