Can long-finned pilot whale social structure be accessed by their calls?
The pulsed calls of long-finned pilot whales, Globicephala melas, are still poorly studied acoustic signals, they have complex structures and functions not yet understood, and these signals seem to be associated with a group's own language which makes them even more instigating. In this study,...
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ftunivfjf:oai:hermes.cpd.ufjf.br:ufjf/10091 2023-05-15T18:21:20+02:00 Can long-finned pilot whale social structure be accessed by their calls? Pires, Ellen Fernandes de Freitas Andriolo, Artur http://lattes.cnpq.br/ Amorim, Thiago Orion Simões Santos, Marcos Roberto Rossi dos Montoril, Michel Helcias 2019-02-25 application/pdf https://repositorio.ufjf.br/jspui/handle/ufjf/10091 por por Universidade Federal de Juiz de Fora (UFJF) Brasil ICB – Instituto de Ciências Biológicas Programa de Pós-graduação em Ciências Biológicas: Comportamento e Biologia Animal UFJF https://repositorio.ufjf.br/jspui/handle/ufjf/10091 Acesso Aberto Globicephala melas Chamados Comunicação Oceano Atlântico Sul Organização social Pulsed calls Communication South Atlantic Ocean Social organization CNPQ::CIENCIAS BIOLOGICAS Dissertação 2019 ftunivfjf 2022-07-17T13:04:27Z The pulsed calls of long-finned pilot whales, Globicephala melas, are still poorly studied acoustic signals, they have complex structures and functions not yet understood, and these signals seem to be associated with a group's own language which makes them even more instigating. In this study, we investigated and compared the parameters of two groups of long-finned pilot whales that were recorded on two occasions during cetacean surveys of the Federal University of Rio Grande in partnership with the Aqualie Institute, aboard the R / V Atlântico Sul on the coast of Brazil, from the region of Chuí to Cabo Frio. The first acoustic recording occurred in May 26th, 2013 at 33º18'S – 50º16'W, while the second acoustic recording occurred in May 12th, 2014 at 33º27'S – 50º35'W. The acoustic recording system was composed by a 250m long towed array with three omnidirectional elements (-40 dB, - 161 dB re: 1V / μPa, Auset®), distant five meters apart and arranged five meters from the end of the cable. The array was connected to a digital recording system composed by a Fostex® FR-2 LE digital recorder (with sampling frequency of 96 kHz/ 24 bits and 48 kHz/ 24 bits, respectively and configured with a high pass filter of 1952 Hz). Spectral parameters of the fundamental component of each call such as initial frequency, final frequency, total duration, maximum frequency, minimum frequency variation were extracted using Raven Pro software 1.5. In order to validate whether the calls belonged to different groups, we used a Vector Support Machine (SVM), implemented in the program R. The result of discriminant analysis (SVM) was positive, where we obtained the separation of the calls in two groups (clans) with an error rate of 18.81%. In order to investigate possible social units within each clan found, a k-means analysis was used, and the results of this analysis pointed out possible social units from calls subsets indicating for the first time a possible complex social structure of the species Globicephala melas for the Western ... Thesis South Atlantic Ocean Repositório Institucional da UFJF (Ri-UFJF, Universidade Federal De Juiz De Fora) |
institution |
Open Polar |
collection |
Repositório Institucional da UFJF (Ri-UFJF, Universidade Federal De Juiz De Fora) |
op_collection_id |
ftunivfjf |
language |
Portuguese |
topic |
Globicephala melas Chamados Comunicação Oceano Atlântico Sul Organização social Pulsed calls Communication South Atlantic Ocean Social organization CNPQ::CIENCIAS BIOLOGICAS |
spellingShingle |
Globicephala melas Chamados Comunicação Oceano Atlântico Sul Organização social Pulsed calls Communication South Atlantic Ocean Social organization CNPQ::CIENCIAS BIOLOGICAS Pires, Ellen Fernandes de Freitas Can long-finned pilot whale social structure be accessed by their calls? |
topic_facet |
Globicephala melas Chamados Comunicação Oceano Atlântico Sul Organização social Pulsed calls Communication South Atlantic Ocean Social organization CNPQ::CIENCIAS BIOLOGICAS |
description |
The pulsed calls of long-finned pilot whales, Globicephala melas, are still poorly studied acoustic signals, they have complex structures and functions not yet understood, and these signals seem to be associated with a group's own language which makes them even more instigating. In this study, we investigated and compared the parameters of two groups of long-finned pilot whales that were recorded on two occasions during cetacean surveys of the Federal University of Rio Grande in partnership with the Aqualie Institute, aboard the R / V Atlântico Sul on the coast of Brazil, from the region of Chuí to Cabo Frio. The first acoustic recording occurred in May 26th, 2013 at 33º18'S – 50º16'W, while the second acoustic recording occurred in May 12th, 2014 at 33º27'S – 50º35'W. The acoustic recording system was composed by a 250m long towed array with three omnidirectional elements (-40 dB, - 161 dB re: 1V / μPa, Auset®), distant five meters apart and arranged five meters from the end of the cable. The array was connected to a digital recording system composed by a Fostex® FR-2 LE digital recorder (with sampling frequency of 96 kHz/ 24 bits and 48 kHz/ 24 bits, respectively and configured with a high pass filter of 1952 Hz). Spectral parameters of the fundamental component of each call such as initial frequency, final frequency, total duration, maximum frequency, minimum frequency variation were extracted using Raven Pro software 1.5. In order to validate whether the calls belonged to different groups, we used a Vector Support Machine (SVM), implemented in the program R. The result of discriminant analysis (SVM) was positive, where we obtained the separation of the calls in two groups (clans) with an error rate of 18.81%. In order to investigate possible social units within each clan found, a k-means analysis was used, and the results of this analysis pointed out possible social units from calls subsets indicating for the first time a possible complex social structure of the species Globicephala melas for the Western ... |
author2 |
Andriolo, Artur http://lattes.cnpq.br/ Amorim, Thiago Orion Simões Santos, Marcos Roberto Rossi dos Montoril, Michel Helcias |
format |
Thesis |
author |
Pires, Ellen Fernandes de Freitas |
author_facet |
Pires, Ellen Fernandes de Freitas |
author_sort |
Pires, Ellen Fernandes de Freitas |
title |
Can long-finned pilot whale social structure be accessed by their calls? |
title_short |
Can long-finned pilot whale social structure be accessed by their calls? |
title_full |
Can long-finned pilot whale social structure be accessed by their calls? |
title_fullStr |
Can long-finned pilot whale social structure be accessed by their calls? |
title_full_unstemmed |
Can long-finned pilot whale social structure be accessed by their calls? |
title_sort |
can long-finned pilot whale social structure be accessed by their calls? |
publisher |
Universidade Federal de Juiz de Fora (UFJF) |
publishDate |
2019 |
url |
https://repositorio.ufjf.br/jspui/handle/ufjf/10091 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
https://repositorio.ufjf.br/jspui/handle/ufjf/10091 |
op_rights |
Acesso Aberto |
_version_ |
1766200545601650688 |