Validation of an acoustic location system to monitor Bornean orangutan (Pongo pygmaeus wurmbii) long calls

American Journal of Primatology
Brigitte SpillmannCarel P van Schaik

Abstract

The long call is an important vocal communication signal in the widely dispersed, semi-solitary orangutan. Long calls affect individuals' ranging behavior and mediate social relationships and regulate encounters between dispersed individuals in a dense rainforest. The aim of this study was to test the utility of an Acoustic Location System (ALS) for recording and triangulating the loud calls of free-living primates. We developed and validated a data extraction protocol for an ALS used to record wild orangutan males' long calls at the Tuanan field site (Central Kalimantan). We installed an ALS in a grid of 300 ha, containing 20 SM2+ recorders placed in a regular lattice at 500 m intervals, to monitor the distribution of calling males in the area. The validated system had the following main features: (i) a user-trained software algorithm (Song Scope) that reliably recognized orangutan long calls from sound files at distances up to 700 m from the nearest recorder, resulting in a total area of approximately 900 ha that could be monitored continuously; (ii) acoustic location of calling males up to 200 m outside the microphone grid, which meant that within an area of approximately 450 ha, call locations could be calculated through tr...Continue Reading

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Citations

Jul 30, 2020·Ecology and Evolution·Tessa A RhinehartJustin Kitzes
Dec 13, 2019·The Behavioral and Brain Sciences·Angelica Kaufmann, Arnon Cahen
May 10, 2019·The Journal of the Acoustical Society of America·Arik KershenbaumSara Waller
Apr 24, 2018·Frontiers in Zoology·Morgane PapinEstelle Germain
Jul 14, 2021·Journal of the Royal Society, Interface·Michael ReinwaldBeth Mortimer

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