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Flora ( Vegetation in Siberut )

Siberut Island is a tropical island which has no dry month. No land system has an elevation >500 m. Thus, it is understandable that vegetation of this island should be low land tropical rain forest. The natural vegetation of Siberut is tropical rainforest and the local flora shows some unique properties and estimated that 15 percent of Siberut’s plant forms are endemic to the island. Mesua cathairinae (Clusiaceae), Diospyros brevicalyx (Ebenaceae), Aporusa quadrangularis (Euphorbiaceae), Baccaurea dulcis (Euphorbiaceae), Drypetes subsymmetrica (Euphorbiaceae) and Horsfieldia macrothyrsa (Myristicaceae) are sample endemic flora from this exotic island. Siberut has at east 7 type forest ecosystem such as: primary dipterocarp forest, primary mixed forest, secondary dipterocarp forest, freshwater swamps forest, mangrove forest, coast forest, sago forest. LIPI recorded there are 846 species, 390 genus dan 131 families in this island. But now, about 60 percent of the project area is covered with secondary or disturbed forest as logged over area because of logging concession before. The structure of these secondary logged forests varies considerably, depending on the original forest composition, degree of disturbance and length of time since they were logged. In other side, local community beliefs that forest serves as a source of medicinal plant/herbal, and from the facts Siberut forest consist 223 medicinal plants that can heal more than 30 diseases.
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Fauna in Siberut

Sundaland Hotspot of Biodiversity” is the name given to this island because it very rich with endemic species.  About 65 percent of mammals are endemic to the island and 168 bird species recorded  (at least 14 of which are considered to be endemic to the archipelago and 21 are protected birds). In addition to the wildlife mentioned above, the island and its surroundings are home to at least 15 species of amphibians (frogs and toads), 40 species of reptiles (geckos, skinks, agamas, snakes, turtles and crocodiles), 8 species of freshwater fish and a few marine mammals like dugong, whales and dolphins. Declared of World Biosphere in 1981 by UNESCO Man and Biosphere Reserve, and the publication of Decree of the Minister of Forestry in 1982 as the basis for Siberut National Park could not avoid threat to wildlife populations due to habitat fragmentation Siberut from deforestation and forest degradation.

Table below shows Threatened Endemic Species in Siberut.
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Local Name Scientific Name IUCN Status
Simakobu Simias concolor Critically Endangered
Bokoi Macaca siberu Vulnerable
Bilou Hylobates klosii Endangered
Joja Presbytis potenziani Endangered
Penyu Belimbing Dermochelys coriacea Critically Endangered

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