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16 February 2018
Startling 50 percent in the orangutan population on the island of Borneo from 1999 to 2015, a population decrease of about 148,500
Startling orangutan population decline recorded in Borneo
By Will Dunham
Reuters16 February 2018
FILE PHOTO: An orangutan hold its baby at the Sepilok Orangutan Rehabilitation Center in the Malaysian state of Sabah on Borneo island on January 11, 2004. REUTERS/Bazuki Muhammad/File PhotoMore
By Will Dunham
WASHINGTON (Reuters) - Hunting by people and habitation destruction by oil palm, paper, logging and mining industries helped drive a startling drop of about 50 percent in the orangutan population on the island of Borneo from 1999 to 2015, scientists said on Thursday.
The researchers calculated a population decrease of about 148,500 during that 16-year period and projected another drop of 45,000 by 2050, painting a bleak picture for the future of these shaggy reddish tree dwellers that are among the world's most imperilled great apes.
Orangutans inhabit lowland forests on Borneo, an island shared by Indonesia, Malaysia and Brunei, and Indonesia's island of Sumatra, eating wild fruits, insects, bark, flowers and leaves.
Deforestation was only part of the danger. Around 70 percent of the loss in Borneo's populations may have resulted from orangutan killings by people in forested areas, the researchers said.
"People have hunted orangutans for their meat on Borneo since they colonised the area, as they hunt any other edible animal," said biologist Maria Voigt of the German Centre for Integrative Biodiversity Research and the Max Planck Institute for Evolutionary Anthropology.
"The orangutans are not their preferred prey species. This is, rather, pigs and deer. But they also take one when encountered. Killing also occurs in situations where humans are frightened or startled by orangutans, for example when orangutans enter gardens or plantations to eat the crop," Voigt added.
The researchers tallied arboreal nests for these apes and used satellite images to appraise forest loss, determining there were between 200,000 and 300,000 Borneo orangutans in 1999 and between 70,000 and 100,000 in 2015.
"It is disheartening that despite all the conservation efforts we still see these declines. But we need to remain optimistic because if the forests remain and we can reduce killing to zero we can, over time, see a rebound of orangutan numbers," Liverpool John Moores University ecologist Serge Wich said.
"Even though the numbers are bleak there is a reason for hope," Voigt added. "We don't think that it is likely that the species is going to go extinct soon, because we are seeing some stable populations in the larger national parks in the Indonesian part of Borneo and the some areas of the Malaysian part."
Borneo has one orangutan species and Sumatra has two. Wich said Sumatran population declines probably are also steep, though that data is less comprehensive.
The research was published in the journal Current Biology.
(Reporting by Will Dunham; Editing by Sandra Maler)
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