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

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dc.contributor.authorOliveira, Eliziane Garcia
dc.contributor.authorRibeiro, Milton Cezar [UNESP]
dc.contributor.authorRoe, Paul
dc.contributor.authorSousa-Lima, Renata S.
dc.contributor.institutionAvenida Senador Salgado Filho
dc.contributor.institutionQueensland University of Technology
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-05-01T05:29:24Z
dc.date.available2022-05-01T05:29:24Z
dc.date.issued2021-10-01
dc.description.abstractAdvances 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.en
dc.description.affiliationLaboratório de Bioacústica (LaB) Departamento de Fisiologia e Comportamento Biosciences Center Universidade Federal do Rio Grande do Norte Avenida Senador Salgado Filho, 3000, Bairro Lagoa Nova
dc.description.affiliationScience and Engineering Faculty Queensland University of Technology, 2 George St
dc.description.affiliationSpatial Ecology and Conservation Lab (LEEC) Department of Biodiversity State University of Sao Paulo (UNESP), Av. 24 A, 1515
dc.description.affiliationGraduate Program in Ecology Biosciences Center Universidade Federal do Rio Grande do Norte Avenida Senador Salgado Filho, 3000, Bairro Lagoa Nova
dc.description.affiliationUnespSpatial Ecology and Conservation Lab (LEEC) Department of Biodiversity State University of Sao Paulo (UNESP), Av. 24 A, 1515
dc.identifierhttp://dx.doi.org/10.1016/j.ecolind.2021.107897
dc.identifier.citationEcological Indicators, v. 129.
dc.identifier.doi10.1016/j.ecolind.2021.107897
dc.identifier.issn1470-160X
dc.identifier.scopus2-s2.0-85108071315
dc.identifier.urihttp://hdl.handle.net/11449/233162
dc.language.isoeng
dc.relation.ispartofEcological Indicators
dc.sourceScopus
dc.subjectAcoustic indices
dc.subjectBioacoustics
dc.subjectEcoacoustics
dc.subjectSeasonally dry tropical forest
dc.subjectSoundscape
dc.titleThe Caatinga Orchestra: Acoustic indices track temporal changes in a seasonally dry tropical foresten
dc.typeArtigo
unesp.author.orcid0000-0002-2638-1695 0000-0002-2638-1695[4]

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