Siamangs (Symphalangus syndactylus) Modify Travel Behavior in Response to Playback Experiments of Anthropogenic Sound Events

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Justin D'Agostino, Dena J. Clink, Abdullah Abdullah, Stephanie Spehar

2025 Ethology Vol. 131 Issue 9 Article Cited by 0 SDG 17SDG 11SDG 15SDG 16 Quartile

Abstract

Anthropogenic noise is a pervasive byproduct of human activity that increasingly impacts wildlife behavior and ecology. This study examines the travel behavior of wild siamang (Symphalangus syndactylus) in response to playback experiments simulating the anthropogenic noises of a jackhammer, traffic, music, and a natural sound control of cicada calls. Over the course of 12 months, seven siamang groups from four field sites in northern Sumatra were studied using GPS-tracked movement patterns pre- and post-playback experiments. We found that siamangs traveled substantially farther following anthropogenic noise playbacks compared to baseline conditions, with the strongest responses to traffic and jackhammer stimuli. Although no significant group level differences (defined here as consistent differences in response patterns across siamang groups) between playback types were observed, there was anecdotal evidence that one group separated in response to noise events. This suggests that anthropogenic noise has the potential to disrupt pair bonds and influence home range usage, with potential fitness consequences. This research underscores the need for further investigation into the ecological impacts of anthropogenic noise and its implications for wildlife conservation. © 2025 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.

Affiliations

University of Tennessee, Knoxville, TN, United States; K. Lisa Yang Center for Conservation Bioacoustics, Cornell Lab of Ornithology, Cornell University, Ithaca, NY, United States; Syiah Kuala University, Banda Aceh, Indonesia; University of Wisconsin Oshkosh, Oshkosh, WI, United States

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