Passive acoustic monitoring of cave-dwelling bats with a sonotype classifier

Labadie Morgane, Morand Serge, Caron Alexandre, De Nys Hélène, Niama Fabien Roch, Nguilili Guytrich Franel, Tobi N'Kaya, Bourgarel Mathieu, Roemer Charlotte. 2025. Passive acoustic monitoring of cave-dwelling bats with a sonotype classifier. Bioacoustics : 1-29.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : The aim of this study in the Republic of Congo was to test a new method to conduct a quantitative study of cave-dwelling bat communities using acoustics. This area is characterised by limited knowledge of the acoustic repertoire of bats. Over a period of 19 months for a total of 398 nights, we carried out 11 individual capture sessions to build a species inventory, record reference sounds and set up a passive acoustic monitoring protocol (PAM) at the exit of two caves. We used the Tadarida automatic sonotype classifier to classify acoustic vocalisations of bats in caves. For this, we enhanced the Tadarida classifier library with reference recordings of bats captured in both caves. Due to the acoustic overlap of several species, we grouped them into five distinct acoustic units using a posteriori classification based on four distinct parameters: call shape, acoustic frequency, a harmonics index and the identification probability. A random manual control stratified by sonotype showed an accuracy ranging from 82% to 98% depending on the group. This study is the first local application of a bat sonotype classifier designed and developed to function globally. It confirms the possibility of undertaking quantitative assessments of bat communities with relatively minimal effort, even in areas with limited knowledge of their acoustic repertoires.

Mots-clés Agrovoc : Chiroptera, acoustique, identification, biodiversité, comportement animal, données acoustiques, caverne, petite exploitation agricole, bioacoustique

Mots-clés géographiques Agrovoc : Congo

Mots-clés libres : Sonotype, Bioacoustics, Congo, Chiroptera, Automatic classifier, Tadarida

Agences de financement européennes : European Commission

Projets sur financement : (COD) Capacity building and surveillance for viral haemorrhagic fever

Auteurs et affiliations

• Labadie Morgane, CIRAD-BIOS-UMR ASTRE (FRA) - auteur correspondant
• Morand Serge, CNRS (FRA) ORCID: 0000-0003-3986-7659
• Caron Alexandre, CIRAD-BIOS-UMR ASTRE (KEN) ORCID: 0000-0002-5213-3273
• De Nys Hélène, CIRAD-BIOS-UMR ASTRE (ZWE) ORCID: 0000-0002-2942-4531
• Niama Fabien Roch, Laboratoire national de santé publique (GNB)
• Nguilili Guytrich Franel, Ministère de l'agriculture, de l'élevage et de la pêche (République démocratique du Congo) (COD)
• Tobi N'Kaya, Ministère de l'agriculture, de l'élevage et de la pêche (République démocratique du Congo) (COD)
• Bourgarel Mathieu, CIRAD-BIOS-UMR ASTRE (MOZ) ORCID: 0000-0001-9774-7669
• Roemer Charlotte, MNHN (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/612012/)

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