Preliminary survey of the southernmost Tapanuli orangutan population

Prasetyo, Didik; Misdi, Misdi; Mulyana, Taufik; Cholifatullah, Fauzan; Sadjudin, Haerudin R; Kuswanda, Wanda; Sugardjito, Jito

doi:10.1017/s0030605321000491

Cited by 2 publications

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“…Their distribution was divided into three different forest blocks i.e. the west block which about 581 orangutans live, the east block with an estimate of 162, and the Sibual-buali Reserve with 24 individuals (Wich et al, 2016;Wich et al, 2019) as well as Lubuk Raya Reserve which estimated less than 5 individuals (Prasetyo et al, 2021). Of this distribution, the Tapanuli orangutan population was dispersed mainly within the protected area 42,98% and 15,54% could be found in the non-protected area (Nowak et al, 2017;Rahman et al, 2019).…”

Section: Study Areamentioning

confidence: 99%

Population Status of Tapanuli Orangutan (Pongo tapanuliensis) within the Renewable Energy Development and its Management Implications

Prasetyo

Hadiprakarsa

Kuswanda³

et al. 2021

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To protect Tapanuli orangutan it is essential to understand the actual situation. It has been studied 15% of its population live outside the protected area facing a density disruption due to forest conversion. Several best management practices have been created and tested for different natural concession types. Yet, the main objective to reduce the impact and increase wildlife survival is far away from the goal. To improve our understanding of the species survival within ongoing project construction, we conducted population density monitoring prior- to post-construction time frames within the hydroelectric dam project. Also, we carried out spatial analysis to understand the land cover change and orangutan’s suitable habitat distribution. This study found that during high construction activities, orangutans were avoiding the threat sources, and returned when the disturbances reduced. These findings indicated orangutans are ecology flexible and have the capability to increase its survival, although the company’s involvement is crucial to facilitate the successes. Our study is based on indirect observation, and spatial modeling, which may lead to an uncertain conclusion. Further research on orangutan ecology and behavior is prioritized.

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Section: Study Areamentioning

confidence: 99%

Population Status of Tapanuli Orangutan (Pongo tapanuliensis) within the Renewable Energy Development and its Management Implications

Prasetyo

Hadiprakarsa

Kuswanda³

et al. 2021

Self Cite

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The effectiveness of artificial canopy bridges for the diurnal primates within a hydroelectric project in North Sumatra-Indonesia

et al. 2022

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Primates that live within fragmented and disturbed habitat are facing population declines and a higher probability of extinction due to gene flow inhibition. To address this problem, land managers, practitioners, and primatologists have applied several approaches to enhance primates’ habitat quality and connectivity through habitat restoration and canopy bridge installation. In some cases, artificial canopy bridges have shown to be effective to facilitate movement between fragmented habitats for several primates’ taxa. However, while several types of canopy bridge designs are available, there is no clear evidence on which is the best for primates. Here we evaluated the effectiveness of three artificial canopy bridge designs within a hydroelectric project in Sumatra, Indonesia from 2019 to 2021. The hydroelectric project was located at the edge of a forest block within the Batang Toru Ecosystem which could disconnect the primate’s population from this protected forest to the other forest blocks. During 595 days of camera trapping, we captured 988 independent crossing events from six diurnal primate species (Pongo tapanuliensis, Hylobates agilis, Symphalangus syndactylus, Presbytis sumatrana, Macaca nemestrina, and Macaca fascicularis). Our initial observation finds the ladder canopy bridge design was commonly used by primates and Presbytis sumatrana was the species that often crossed the canopy bridge. These findings are important to improve species management plans and primate conservation in Indonesia.

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Preliminary survey of the southernmost Tapanuli orangutan population

Cited by 2 publications

References 0 publications

Population Status of Tapanuli Orangutan (Pongo tapanuliensis) within the Renewable Energy Development and its Management Implications

Population Status of Tapanuli Orangutan (Pongo tapanuliensis) within the Renewable Energy Development and its Management Implications

The effectiveness of artificial canopy bridges for the diurnal primates within a hydroelectric project in North Sumatra-Indonesia

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