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PLoS One. 2019 Jul 17;14(7):e0218819. doi: 10.1371/journal.pone.0218819. eCollection 2019.

Changes to Sabah's orangutan population in recent times: 2002-2017.

Author information

1
WWF-Malaysia, Kota Kinabalu, Sabah, Malaysia.
2
Durrell Institute of Conservation and Ecology (DICE), University of Kent, Canterbury, United Kingdom.
3
HUTAN-Kinabatangan Orangutan Conservation Programme, Sandakan, Sabah, Malaysia.
4
Borneo Futures, Bandar Seri Begawan, Brunei Darussalam.

Abstract

The Bornean orangutan is critically endangered and monitoring its population is needed to inform effective conservation management. In this paper, we present results of 2014-17 aerial nest surveys of the major orangutan populations in Sabah and compare them with baseline data produced during surveys conducted in 2002-03 using similar methods. Our results show three important points: a) by increasing the survey effort (estimated at 15-25% cover), sparsely scattered orangutan sub-populations not recorded in the previous aerial surveys were located and the accuracy of the nest count estimates is expected to improve; b) large populations in the interior forests of Sabah, occupying sustainably managed logged and unlogged forests, have been stable over 15 years and are of vital importance for the species' conservation; c) fragmented populations located in eastern Sabah, that are surrounded by extensive oil palm plantations, have declined at varying rates.

PMID:
31314781
PMCID:
PMC6636716
DOI:
10.1371/journal.pone.0218819
[Indexed for MEDLINE]
Free PMC Article

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