Research press release


Scientific Reports

Behaviour: Why did the orang-utan come down from the tree


ボルネオオランウータン(Pongo pygmaeus)は、世界で最も大型の樹上性哺乳類だ。その陸上での行動を示す記録は非常に少なく、生息地の撹乱と関連している傾向がある。今回、Marc Ancrenazたちは、ボルネオ島の16地点で得られた包括的なカメラトラップデータを用いて、オランウータンの陸上行動に関する大規模解析を行い、オランウータンが樹上から降りて陸上を移動する程度とこの行動が人為的撹乱の影響を受けているのかどうかの評価を試みた。


Orang-utans may venture down from their arboreal habitat in the Bornean rainforest more often than previous anecdotal observations indicated. Research published in the journal Scientific Reports provides evidence of male and female orang-utans of all ages travelling on the ground. The study suggests that orang-utans may potentially be more resilient to drastic habitat change than previously thought.

The Bornean orang-utan (Pongo pygmaeus) is the world’s largest arboreal mammal. Records of terrestrial behaviour are rare and tend to be associated with habitat disturbance. Marc Ancrenaz and colleagues conducted a large-scale analysis of orang-utan terrestriality using comprehensive camera-trapping data from 16 sites across Borneo. The authors sought to evaluate the extent to which orang-utans come down from the trees to travel terrestrially, and the whether anthropogenic disturbances influence this behaviour.

Orang-utans from all age-sex classes were recorded on the ground, with large flanged males (those with distinctive cheek pads, throat pouches and long fur) making terrestrial appearances most frequently. Additionally, orang-utans were recorded on the ground in primary forests as well as in heavily degraded habitats, suggesting that anthropogenic canopy disruptions may influence terrestrial activity, but are not the only driver of this behaviour. The findings suggest that terrestrial locomotion may have a larger than expected role in the Bornean orang-utan’s natural behavioural repertoire.

doi: 10.1038/srep04024


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