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Tag: Habitat

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 wildl...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Timber concessions
Some timber concessions overlap orangutan habitat in a number of key locations. If left to recover after logging, orangutans will gradually return to former concessions. But if the land is converted to monoculture planta...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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 for managing its forests. Some areas re...
01 Mar 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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 the map have been cleared and planted yet. The m...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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 Sumatran orangutan serves as a useful example to illustrate how the fat...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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 mos...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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), and the results are presented for these types separately. Values for ...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Conservation areas and the Leuser Ecosystem
Approximately 50% of Sumatran orangutan habitat is inside conservation areas directly managed by the Ministry of Forestry, and 78% lies within the boundaries of the vast Leuser Ecosystem Conservation Area.
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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 is very important to guarantee proper functioning of ecosystem services relate...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Land not suitable for major agriculture crops
An estimated 88% of Sumatran orangutan habitat is on land classified by Indonesian Government studies (RePPProT) as completely unsuitable for cultivation of major crops such as oil palm, rubber, robusta coffee or cocoa. O...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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 indirectly by road access. It includes a major gold mine near the town of Ba...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Elevation
The Bukit Barisan mountain range that runs down the full length of Sumatra reach altitudes of over 3,000 meters above sea level (m asl), with the highest peaks being Gunung Kerinci in West Sumatra (3,800 m asl) and Gunun...
13 Sep 2011 - 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 ...
15 Nov 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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