Changes

Given the discovery of orangutans at altitudes up to 1,500 m asl in various areas, connectivity among subpopulations in the mountainous Leuser Ecosystem is likely better than previously believed (Wich et al. 2008). However, recent studies indicate genetic differentiation between subpopulations, partly attributed to geographic barriers like rivers and high mountain ridges, even within the Leuser Ecosystem (Nater et al. 2013).

Given the discovery of orangutans at altitudes up to 1,500 m asl in various areas, connectivity among subpopulations in the mountainous Leuser Ecosystem is likely better than previously believed (Wich et al. 2008). However, recent studies indicate genetic differentiation between subpopulations, partly attributed to geographic barriers like rivers and high mountain ridges, even within the Leuser Ecosystem (Nater et al. 2013).

Apart from wild populations, two new Sumatran orangutan populations are emerging through the reintroduction of confiscated illegal pets—one around Bukit Tigapuluh National Park (Jambi and Riau provinces) and another around Jantho Pine Forest Nature Reserve in northern Aceh, with over 260 individuals reintroduced. The aim is to establish genetically-viable, self-sustaining wild populations as a safety net (Singleton et al. 2023).

Apart from wild populations, two new Sumatran orangutan populations are emerging through the reintroduction of confiscated illegal pets—one around Bukit Tigapuluh National Park (Jambi and Riau provinces) and another around Jantho Pine Forest Nature Reserve in northern Aceh, with over 260 individuals reintroduced. The aim is to establish genetically-viable, self-sustaining wild populations as a safety net (Singleton et al. 2023).

'''Threats'''

'''Threats'''