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Population Survey of the Philippine Tarsier (Tarsius syrichta) in Corella, Bohol

In: Folia Primatologica
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In 1986, in response to the rapid habitat destruction throughout the archipelago, the Philippine tarsier was classified as endangered. Since that time, this tarsier has been reclassified as data deficient and more recently as near threatened despite a significant lack of information on the population density of the species. Data were collected at the Philippine Tarsier Foundation Sanctuary from June to October 2010. Population density was estimated using a modified form of the quadrat census method. A total of 55 individuals were located within the sampled area. This is equivalent to approximately 1.55 tarsiers per hectare. Ecologically, there were significantly more tarsiers found in the young secondary forest than in areas characterized as old secondary forest. Extrapolating to the entire protected area, as many as 258 tarsiers may reside in the sanctuary. The vegetation plots where tarsiers were found had substantially more trees per plot, contained trees with larger diameters, and contained slightly taller trees than did the plots where no tarsiers were observed.

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