The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest

Detalhes bibliográficos
Autor(a) principal: Oliveira, Eliziane Garcia
Data de Publicação: 2021
Outros Autores: Ribeiro, Milton Cezar [UNESP], Roe, Paul, Sousa-Lima, Renata S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.ecolind.2021.107897
http://hdl.handle.net/11449/233162
Resumo: Advances in technologies for data acquisition, storage and analysis have boosted Acoustic Ecology studies, but protocols are still lacking. There is a need of more research to understand which methodologies can be applied to answer ecological questions in different environments with varying temporal and spatial dynamics. Tropical forests are generally more complex than temperate ones, both in terms of use of acoustic space and species diversity. The seasonally dry tropical forest (SDTF) in Brazil, known as Caatinga, is a threatened biome, with two marked seasons that shape vegetation and animal activity patterns. In this study, we investigate the applicability of passive acoustics in monitoring SDTF, describing the soundscape and tracking diel patterns and seasonal changes. Combining multiple indices, visualization through false colour spectrograms and clustering, we describe the acoustic activity of the main faunal groups that compose the biophonic orchestra in a SDTF area in the Northeast of Brazil. Distinct patterns were found between day – when birds and wind were the main sound sources – and night – with Orthopterans occupying a large frequency band. Other sound sources in the SDTF soundscape included cicada, rain, and anthropogenic influence such as domestic animals, cars and gunshots. Clustering of eleven acoustic indices was useful to distinguish sound patterns from several sources, especially in the dry season. Further investigation within each cluster showed specific relationships among selected indices and different sound sources. Birds were associated with Entropy of the Spectral Peaks (EPS) and Orthopterans also had a relationship with EPS, as well as with Entropy of Average Spectrum (EAS) and High Frequency Cover (HFC). Variation in diel values of these selected indices, as well as the number of samples included in each cluster category, were successfully used to describe the acoustic activity of Birds and Orthopterans and to track changes between rainy and dry seasons. A better understanding of the soundscape dynamics in a highly seasonal tropical environment was achieved by applying cheap and reliable novel methodologies to study biodiversity in geopolitical regions where funding for conservation initiatives is limited.
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spelling The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forestAcoustic indicesBioacousticsEcoacousticsSeasonally dry tropical forestSoundscapeAdvances in technologies for data acquisition, storage and analysis have boosted Acoustic Ecology studies, but protocols are still lacking. There is a need of more research to understand which methodologies can be applied to answer ecological questions in different environments with varying temporal and spatial dynamics. Tropical forests are generally more complex than temperate ones, both in terms of use of acoustic space and species diversity. The seasonally dry tropical forest (SDTF) in Brazil, known as Caatinga, is a threatened biome, with two marked seasons that shape vegetation and animal activity patterns. In this study, we investigate the applicability of passive acoustics in monitoring SDTF, describing the soundscape and tracking diel patterns and seasonal changes. Combining multiple indices, visualization through false colour spectrograms and clustering, we describe the acoustic activity of the main faunal groups that compose the biophonic orchestra in a SDTF area in the Northeast of Brazil. Distinct patterns were found between day – when birds and wind were the main sound sources – and night – with Orthopterans occupying a large frequency band. Other sound sources in the SDTF soundscape included cicada, rain, and anthropogenic influence such as domestic animals, cars and gunshots. Clustering of eleven acoustic indices was useful to distinguish sound patterns from several sources, especially in the dry season. Further investigation within each cluster showed specific relationships among selected indices and different sound sources. Birds were associated with Entropy of the Spectral Peaks (EPS) and Orthopterans also had a relationship with EPS, as well as with Entropy of Average Spectrum (EAS) and High Frequency Cover (HFC). Variation in diel values of these selected indices, as well as the number of samples included in each cluster category, were successfully used to describe the acoustic activity of Birds and Orthopterans and to track changes between rainy and dry seasons. A better understanding of the soundscape dynamics in a highly seasonal tropical environment was achieved by applying cheap and reliable novel methodologies to study biodiversity in geopolitical regions where funding for conservation initiatives is limited.Laboratório de Bioacústica (LaB) Departamento de Fisiologia e Comportamento Biosciences Center Universidade Federal do Rio Grande do Norte Avenida Senador Salgado Filho, 3000, Bairro Lagoa NovaScience and Engineering Faculty Queensland University of Technology, 2 George StSpatial Ecology and Conservation Lab (LEEC) Department of Biodiversity State University of Sao Paulo (UNESP), Av. 24 A, 1515Graduate Program in Ecology Biosciences Center Universidade Federal do Rio Grande do Norte Avenida Senador Salgado Filho, 3000, Bairro Lagoa NovaSpatial Ecology and Conservation Lab (LEEC) Department of Biodiversity State University of Sao Paulo (UNESP), Av. 24 A, 1515Avenida Senador Salgado FilhoQueensland University of TechnologyUniversidade Estadual Paulista (UNESP)Oliveira, Eliziane GarciaRibeiro, Milton Cezar [UNESP]Roe, PaulSousa-Lima, Renata S.2022-05-01T05:29:24Z2022-05-01T05:29:24Z2021-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.ecolind.2021.107897Ecological Indicators, v. 129.1470-160Xhttp://hdl.handle.net/11449/23316210.1016/j.ecolind.2021.1078972-s2.0-85108071315Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEcological Indicatorsinfo:eu-repo/semantics/openAccess2022-05-01T05:29:25Zoai:repositorio.unesp.br:11449/233162Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:11:49.861011Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
title The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
spellingShingle The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
Oliveira, Eliziane Garcia
Acoustic indices
Bioacoustics
Ecoacoustics
Seasonally dry tropical forest
Soundscape
title_short The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
title_full The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
title_fullStr The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
title_full_unstemmed The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
title_sort The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
author Oliveira, Eliziane Garcia
author_facet Oliveira, Eliziane Garcia
Ribeiro, Milton Cezar [UNESP]
Roe, Paul
Sousa-Lima, Renata S.
author_role author
author2 Ribeiro, Milton Cezar [UNESP]
Roe, Paul
Sousa-Lima, Renata S.
author2_role author
author
author
dc.contributor.none.fl_str_mv Avenida Senador Salgado Filho
Queensland University of Technology
Universidade Estadual Paulista (UNESP)
dc.contributor.author.fl_str_mv Oliveira, Eliziane Garcia
Ribeiro, Milton Cezar [UNESP]
Roe, Paul
Sousa-Lima, Renata S.
dc.subject.por.fl_str_mv Acoustic indices
Bioacoustics
Ecoacoustics
Seasonally dry tropical forest
Soundscape
topic Acoustic indices
Bioacoustics
Ecoacoustics
Seasonally dry tropical forest
Soundscape
description Advances in technologies for data acquisition, storage and analysis have boosted Acoustic Ecology studies, but protocols are still lacking. There is a need of more research to understand which methodologies can be applied to answer ecological questions in different environments with varying temporal and spatial dynamics. Tropical forests are generally more complex than temperate ones, both in terms of use of acoustic space and species diversity. The seasonally dry tropical forest (SDTF) in Brazil, known as Caatinga, is a threatened biome, with two marked seasons that shape vegetation and animal activity patterns. In this study, we investigate the applicability of passive acoustics in monitoring SDTF, describing the soundscape and tracking diel patterns and seasonal changes. Combining multiple indices, visualization through false colour spectrograms and clustering, we describe the acoustic activity of the main faunal groups that compose the biophonic orchestra in a SDTF area in the Northeast of Brazil. Distinct patterns were found between day – when birds and wind were the main sound sources – and night – with Orthopterans occupying a large frequency band. Other sound sources in the SDTF soundscape included cicada, rain, and anthropogenic influence such as domestic animals, cars and gunshots. Clustering of eleven acoustic indices was useful to distinguish sound patterns from several sources, especially in the dry season. Further investigation within each cluster showed specific relationships among selected indices and different sound sources. Birds were associated with Entropy of the Spectral Peaks (EPS) and Orthopterans also had a relationship with EPS, as well as with Entropy of Average Spectrum (EAS) and High Frequency Cover (HFC). Variation in diel values of these selected indices, as well as the number of samples included in each cluster category, were successfully used to describe the acoustic activity of Birds and Orthopterans and to track changes between rainy and dry seasons. A better understanding of the soundscape dynamics in a highly seasonal tropical environment was achieved by applying cheap and reliable novel methodologies to study biodiversity in geopolitical regions where funding for conservation initiatives is limited.
publishDate 2021
dc.date.none.fl_str_mv 2021-10-01
2022-05-01T05:29:24Z
2022-05-01T05:29:24Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.ecolind.2021.107897
Ecological Indicators, v. 129.
1470-160X
http://hdl.handle.net/11449/233162
10.1016/j.ecolind.2021.107897
2-s2.0-85108071315
url http://dx.doi.org/10.1016/j.ecolind.2021.107897
http://hdl.handle.net/11449/233162
identifier_str_mv Ecological Indicators, v. 129.
1470-160X
10.1016/j.ecolind.2021.107897
2-s2.0-85108071315
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Ecological Indicators
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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