The Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical forest
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
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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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 |
|
_version_ |
1808129297011965952 |