Utility of acoustic indices for ecological monitoring in complex sonic environments

With the continued adoption of passive acoustic monitoring as a tool for rapid and high-resolution ecosystem monitoring, ecologists are increasingly making use of a suite of acoustic indices to summarise the sonic environment. Though these indices are often reported to well represent some aspect of...

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Autores principales:	Samuel R.P-J. Ross, Nicholas R. Friedman, Masashi Yoshimura, Takuma Yoshida, Ian Donohue, Evan P. Economo
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Soundscape Ecoacoustics Okinawa Passive acoustic monitoring Aural inventory Cicadas Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/89e9f85e65dc45439f30796adb9f6d50
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id	oai:doaj.org-article:89e9f85e65dc45439f30796adb9f6d50
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spelling	oai:doaj.org-article:89e9f85e65dc45439f30796adb9f6d502021-12-01T04:35:31ZUtility of acoustic indices for ecological monitoring in complex sonic environments1470-160X10.1016/j.ecolind.2020.107114https://doaj.org/article/89e9f85e65dc45439f30796adb9f6d502021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20310530https://doaj.org/toc/1470-160XWith the continued adoption of passive acoustic monitoring as a tool for rapid and high-resolution ecosystem monitoring, ecologists are increasingly making use of a suite of acoustic indices to summarise the sonic environment. Though these indices are often reported to well represent some aspect of the biology of an ecosystem, the degree to which they are confounded by various extraneous sonic conditions is largely unknown. We conducted an aural inventory across 23 field sites in Okinawa to identify the number of unique animal sounds present in recordings. Using these values of ‘measured richness’, we then examined how the performance of 11 commonly-used acoustic indices varied across a range of sonic conditions (including in the presence and absence of insect stridulations, audible wind or rain, and human-related sounds). Our analysis identified both well- and poor-performing acoustic indices, as well as those that were particularly sensitive to sonic conditions. Only two indices reflected measured richness across the full range of sonic conditions examined. A few indices were relatively insensitive to extraneous sonic conditions, but no index correlated with measured richness when masked by sound from broadband stridulating insects. Our results demonstrate considerable sensitivity of most commonly used acoustic indices to confounding sonic conditions, highlighting the challenges of working with large acoustic datasets collected in the field. We make practical recommendations for acoustic index use based on study design, with the aim of identifying the suite of acoustic indices with greatest utility as indicators for rapid biodiversity monitoring and management of the world’s natural soundscapes.Samuel R.P-J. RossNicholas R. FriedmanMasashi YoshimuraTakuma YoshidaIan DonohueEvan P. EconomoElsevierarticleSoundscapeEcoacousticsOkinawaPassive acoustic monitoringAural inventoryCicadasEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107114- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Soundscape Ecoacoustics Okinawa Passive acoustic monitoring Aural inventory Cicadas Ecology QH540-549.5
spellingShingle	Soundscape Ecoacoustics Okinawa Passive acoustic monitoring Aural inventory Cicadas Ecology QH540-549.5 Samuel R.P-J. Ross Nicholas R. Friedman Masashi Yoshimura Takuma Yoshida Ian Donohue Evan P. Economo Utility of acoustic indices for ecological monitoring in complex sonic environments
description	With the continued adoption of passive acoustic monitoring as a tool for rapid and high-resolution ecosystem monitoring, ecologists are increasingly making use of a suite of acoustic indices to summarise the sonic environment. Though these indices are often reported to well represent some aspect of the biology of an ecosystem, the degree to which they are confounded by various extraneous sonic conditions is largely unknown. We conducted an aural inventory across 23 field sites in Okinawa to identify the number of unique animal sounds present in recordings. Using these values of ‘measured richness’, we then examined how the performance of 11 commonly-used acoustic indices varied across a range of sonic conditions (including in the presence and absence of insect stridulations, audible wind or rain, and human-related sounds). Our analysis identified both well- and poor-performing acoustic indices, as well as those that were particularly sensitive to sonic conditions. Only two indices reflected measured richness across the full range of sonic conditions examined. A few indices were relatively insensitive to extraneous sonic conditions, but no index correlated with measured richness when masked by sound from broadband stridulating insects. Our results demonstrate considerable sensitivity of most commonly used acoustic indices to confounding sonic conditions, highlighting the challenges of working with large acoustic datasets collected in the field. We make practical recommendations for acoustic index use based on study design, with the aim of identifying the suite of acoustic indices with greatest utility as indicators for rapid biodiversity monitoring and management of the world’s natural soundscapes.
format	article
author	Samuel R.P-J. Ross Nicholas R. Friedman Masashi Yoshimura Takuma Yoshida Ian Donohue Evan P. Economo
author_facet	Samuel R.P-J. Ross Nicholas R. Friedman Masashi Yoshimura Takuma Yoshida Ian Donohue Evan P. Economo
author_sort	Samuel R.P-J. Ross
title	Utility of acoustic indices for ecological monitoring in complex sonic environments
title_short	Utility of acoustic indices for ecological monitoring in complex sonic environments
title_full	Utility of acoustic indices for ecological monitoring in complex sonic environments
title_fullStr	Utility of acoustic indices for ecological monitoring in complex sonic environments
title_full_unstemmed	Utility of acoustic indices for ecological monitoring in complex sonic environments
title_sort	utility of acoustic indices for ecological monitoring in complex sonic environments
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/89e9f85e65dc45439f30796adb9f6d50
work_keys_str_mv	AT samuelrpjross utilityofacousticindicesforecologicalmonitoringincomplexsonicenvironments AT nicholasrfriedman utilityofacousticindicesforecologicalmonitoringincomplexsonicenvironments AT masashiyoshimura utilityofacousticindicesforecologicalmonitoringincomplexsonicenvironments AT takumayoshida utilityofacousticindicesforecologicalmonitoringincomplexsonicenvironments AT iandonohue utilityofacousticindicesforecologicalmonitoringincomplexsonicenvironments AT evanpeconomo utilityofacousticindicesforecologicalmonitoringincomplexsonicenvironments
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Utility of acoustic indices for ecological monitoring in complex sonic environments

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