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PLUNGING POPULATION. A wild orangutan is spotted in a tree during a rescue and release operation for orangutans trapped in a swath of jungle destroyed by a forest fire in Sungai Mangkutub, Central Kalimantan, Indonesia, in this January 7, 2016 file photo. The most comprehensive study of Borneo’s orangutans estimates their numbers have plummeted by more than 100,000 since 1999. (AP Photo/Dita Alangkara, File)

From The Asian Reporter, V28, #6 (March 19, 2018), page 3.

Borneo’s orangutan population has plunged by 100,000 since 1999

JAKARTA, Indonesia (AP) — The most comprehensive study of Borneo’s orangutans estimates their numbers have plummeted by more than 100,000 since 1999, as palm-oil and paper industries shrink their jungle habitat and fatal conflicts with people increase.

The finding, published in the journal Current Biology, is in line with the 2016 designation of Borneo’s orangutans as critically endangered by the International Union for Conservation of Nature (IUCN).

Researchers from the Max Planck Institute for Evolutionary Anthropology and other institutions said the original population of the gentle ginger-haired great apes is larger than previously estimated, but so is the rate of decline.

The most dramatic declines were found in areas where tropical forests were cut down and converted to plantations for palm oil, which is used in a vast array of consumer products, and for timber.

But significant population declines occurred in selectively logged forests.

"In these forest areas, human pressures such as conflict killing, poaching, and the collection of baby orangutans for the pet trade, have probably been the major drivers of decline," the authors of the study said.

In February, an orangutan on the Indonesian part of Borneo island died after being shot at least 130 times with an air gun, stabbed, and clubbed.

Erik Meijaard, a conservationist involved in the study, said current estimates of the orangutan population on Borneo range from 75,000 to 100,000.

He said the estimates vary because of uncertainty about how many animals are living in alien habitats such as plantations and burnt forests.

According to IUCN, their numbers could drop to 47,000 by 2025 from their 2016 population estimate of about 105,000.

Sumatra’s orangutan, a separate species, is even more endangered, with a population estimated at about 12,000 animals.

In a positive twist, the new study found Bornean orangutans are more resilient and adaptable than thought. They walk on the ground more often than previously known and can feed on plants that have not been part of their natural diet.

The authors said this may allow them to survive in smaller forests and in landscapes where the forest is fragmented.

"The one thing they cannot cope with, however, is the high killing rates seen currently," said Serge Wich of Liverpool John Moores University, one of the researchers.

"Orangutans are a very slow breeding species," he said in a statement. "If only one in 100 adult orangutans is removed from a population per year, this population has a high likeliness to go extinct."

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