Range Restriction Makes Tapanuli Orangutan the Most Geographically Limited Great Ape

All known individuals fit inside a forest smaller than many cities.

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🤯 Did You Know (click to read)

The Tapanuli orangutan was only recognized as a distinct species in 2017.

The Tapanuli orangutan occupies a total range of roughly 1,000 square kilometers in the Batang Toru ecosystem. This makes it the most geographically restricted of all great ape species. Other great apes inhabit multiple reserves or countries, providing geographic redundancy. In contrast, this species exists in a single mountainous landscape. Range restriction increases exposure to localized threats. Natural disasters, disease, or infrastructure projects affect the entire species simultaneously. Geographic limitation amplifies extinction probability. Its survival depends entirely on the stability of one forested valley.

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💥 Impact (click to read)

When a species occupies such a small area, conservation becomes hyper-local yet globally significant. Land-use decisions within a few hundred square kilometers influence planetary biodiversity. A single wildfire or road network can impact a measurable fraction of the population. The species lacks spatial insurance. Geography offers no backup plan.

Range restriction also constrains future adaptation to climate change. Shifting temperature or rainfall patterns leave limited space for migration. Protecting the Batang Toru ecosystem effectively means protecting the entire species. Few great apes face such total geographic dependence. One valley carries an evolutionary lineage.

Source

IUCN Red List Assessment

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