Worldwide Soundscapes : A Synthesis of Passive Acoustic Monitoring Across Realms

Darras, Kevin F. A. and Rountree, Rodney A. and Van Wilgenburg, Steven L. and Cord, Anna F. and Pitz, Frederik and Chen, Youfang and Dong, Lijun and Rocquencourt, Agnès and Desjonquères, Camille and Diaz, Patrick Mauritz and Lin, Tzu‐Hao and Turco, Théophile and Emmerson, Louise and Bradfer‐Lawrence, Tom and Gasc, Amandine and Marley, Sarah and Salton, Marcus and Schillé, Laura and Wensveen, Paul J. and Wu, Shih‐Hung and Acero‐Murcia, Adriana C. and Acevedo‐Charry, Orlando and Adam, Matyáš and Aguzzi, Jacopo and Akoglu, Irmak and Amorim, M. 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Global Ecology and Biogeography, 34 (5): e70021. ISSN 1466-822X

Abstract

Aim: The urgency for remote, reliable and scalable biodiversity monitoring amidst mounting human pressures on ecosystems has sparked worldwide interest in Passive Acoustic Monitoring (PAM), which can track life underwater and on land. However, we lack a unified methodology to report this sampling effort and a comprehensive overview of PAM coverage to gauge its potential as a global research and monitoring tool. To address this gap, we created the Worldwide Soundscapes project, a collaborative network and growing database comprising metadata from 416 datasets across all realms (terrestrial, marine, freshwater and subterranean). Location: Worldwide, 12,343 sites, all ecosystem types. Time Period: 1991 to present. Major Taxa Studied: All soniferous taxa. Methods: We synthesise sampling coverage across spatial, temporal and ecological scales using metadata describing sampling locations, deployment schedules, focal taxa and audio recording parameters. We explore global trends in biological, anthropogenic and geophysical sounds based on 168 selected recordings from 12 ecosystems across all realms. Results: Terrestrial sampling is spatially denser (46 sites per million square kilometre—Mkm2) than aquatic sampling (0.3 and 1.8 sites/Mkm2 in oceans and fresh water) with only two subterranean datasets. Although diel and lunar cycles are well sampled across realms, only marine datasets (55%) comprehensively sample all seasons. Across the 12 ecosystems selected for exploring global acoustic trends, biological sounds showed contrasting diel patterns across ecosystems, declined with distance from the Equator, and were negatively correlated with anthropogenic sounds. Main Conclusions: PAM can inform macroecological studies as well as global conservation and phenology syntheses, but representation can be improved by expanding terrestrial taxonomic scope, sampling coverage in the high seas and subterranean ecosystems, and spatio‐temporal replication in freshwater habitats. Overall, this worldwide PAM network holds promise to support cross‐realm biodiversity research and monitoring efforts.