The recent devastating floods in Indonesia have had a catastrophic impact on the world's rarest great ape, the Tapanuli orangutan. This species, already facing numerous threats, has suffered a devastating loss, with 58 individuals killed, representing 7% of the remaining population. The study, published in the journal Current Biology, highlights the devastating effects of extreme rainfall and landslides, fueled by the climate crisis, on this critically endangered species.
The research team, led by Prof Serge Wich and Prof Jatna Supriatna, combined satellite imagery analysis with ape density estimates to determine the impact of Cyclone Senyar on the Tapanuli orangutans in the Batang Toru ecosystem. The results are alarming, with approximately 8,300 hectares of forest habitat destroyed by landslides, an area equivalent to 11.7% of the key forest habitat. Human-induced climate change, caused by the burning of fossil fuels, is estimated to have increased rainfall intensity by up to 50%, exacerbating the severity of the event.
"The loss of an estimated 58 Tapanuli orangutans to a single climate-induced landslide event is a devastating demographic shock to the world’s rarest great ape," said Prof Jatna Supriatna. "To prevent the first modern extinction of a great ape species, Indonesia must permanently protect the Batang Toru ecosystem, but our international partners must also meet their global commitments by providing immediate biodiversity-recovery financing."
This tragic event underscores the vulnerability of the Tapanuli orangutan to climate-related disasters. Previous research has suggested that annual losses of 1% of the population would be sufficient to lead to eventual extinction. The Indonesian government has responded by temporarily pausing all major industrial activity in the Batang Toru area, allowing scientists to investigate and develop strategies to secure the long-term survival of the species while also assessing the risks to human lives.
The study's authors recommend an immediate moratorium on land-use activities that degrade the remaining Tapanuli orangutan habitat and the expansion of protected areas to stabilize the population. This is a crucial step towards ensuring the species' survival, but it also highlights the urgent need for global action to address the climate crisis and its devastating impact on biodiversity.
In my opinion, this tragedy serves as a stark reminder of the interconnectedness of our planet's ecosystems and the profound impact of human activities on the natural world. It is a call to action for all of us to take responsibility for our environmental footprint and work towards a more sustainable future. The fate of the Tapanuli orangutan is a reminder that the survival of all species, including our own, depends on our ability to protect and preserve the delicate balance of nature.
