Processing and analysis of bioacoustic signals in the southern Indian Ocean
Blue whales (Balaenoptera musculus ssp) were brought to the brink of extinction during whaling and are still endangered today. In the southern Indian Ocean, a remote region subject to extreme weather conditions, passive acoustics quickly became the preferred method for monitoring these large marine...
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Language: | French |
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2020
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ftunivbrest:oai:HAL:tel-03372735v1 2023-05-15T13:34:24+02:00 Processing and analysis of bioacoustic signals in the southern Indian Ocean Traitement et analyse de données bioacoustiques dans l'océan Indien austral : application aux baleines bleues Torterotot, Maëlle Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Jean-Yves Royer Flore Samaran 2020-11-05 https://theses.hal.science/tel-03372735 https://theses.hal.science/tel-03372735/document https://theses.hal.science/tel-03372735/file/These-2020-3M-Acoustique_sous_marine_et_traitement_du_signal-TORTEROTOT_Maelle.pdf fr fre HAL CCSD NNT: 2020BRES0058 tel-03372735 https://theses.hal.science/tel-03372735 https://theses.hal.science/tel-03372735/document https://theses.hal.science/tel-03372735/file/These-2020-3M-Acoustique_sous_marine_et_traitement_du_signal-TORTEROTOT_Maelle.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03372735 Autre. Université de Bretagne occidentale - Brest, 2020. Français. ⟨NNT : 2020BRES0058⟩ Blue whale Southern Indian Ocean Bioacoustics Passive acoustic monitoring Baleine bleue Océan Indien austral Bioacoustique Surveillance acoustique passive [SPI.OTHER]Engineering Sciences [physics]/Other info:eu-repo/semantics/doctoralThesis Theses 2020 ftunivbrest 2023-02-14T23:43:22Z Blue whales (Balaenoptera musculus ssp) were brought to the brink of extinction during whaling and are still endangered today. In the southern Indian Ocean, a remote region subject to extreme weather conditions, passive acoustics quickly became the preferred method for monitoring these large marine mammals. This thesis is based on acoustic data recorded from 2010 to 2018 by a large hydrophone network in the southern Indian Ocean. An automatic detection algorithm, whose performance was thoroughly evaluated beforehand, is applied to detect the stereotyped and non-stereotyped calls (D-calls) of Antarctic blue whales and Australian and Madagascan pygmy blue whales. Detections of stereotyped calls refine the spatial and seasonal distributions previously described in the southern Indian Ocean and reveal that Antarctic and pygmy blue whales use this region in very different ways. Comparison between the geographical presence of stereotyped and nonstereotyped calls suggests a change in the acoustic behavior of blue whales between subtropical and subantarctic regions. Finally, the characterization of the southern Indian Ocean soundscape indicates that anthropogenic signals are prevalent, even in remote areas. La baleine bleue (Balaenoptera musculus ssp) a été menée au bord de l’extinction durant la chasse baleinière et est aujourd’hui toujours en danger. Dans l’océan Indien austral, une région reculée et soumise à des conditions météorologiques extrêmes, l’utilisation de l’acoustique passive s’est rapidement imposée pour le suivi de ces grands mammifères marins. Cette thèse repose sur des enregistrements acoustiques acquis de 2010 à 2018 par un réseau d’hydrophones de grande envergure situé dans l’océan Indien austral. Un algorithme de détection automatique, dont les performances sont préalablement évaluées, est appliqué pour détecter les vocalisations stéréotypées et non-stéréoptyées (D-calls) des baleines bleues Antarctique et des baleines bleues pygmées d’Australie et de Madagascar. Les détections des vocalisations ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctique* Balaenoptera musculus Baleine bleue Blue whale Université de Bretagne Occidentale: HAL Antarctic Austral Baleine ENVELOPE(140.012,140.012,-66.649,-66.649) Baleinière ENVELOPE(140.015,140.015,-66.664,-66.664) Bleue ENVELOPE(141.406,141.406,-66.819,-66.819) Indian la Baleine ENVELOPE(140.012,140.012,-66.649,-66.649) |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
French |
topic |
Blue whale Southern Indian Ocean Bioacoustics Passive acoustic monitoring Baleine bleue Océan Indien austral Bioacoustique Surveillance acoustique passive [SPI.OTHER]Engineering Sciences [physics]/Other |
spellingShingle |
Blue whale Southern Indian Ocean Bioacoustics Passive acoustic monitoring Baleine bleue Océan Indien austral Bioacoustique Surveillance acoustique passive [SPI.OTHER]Engineering Sciences [physics]/Other Torterotot, Maëlle Processing and analysis of bioacoustic signals in the southern Indian Ocean |
topic_facet |
Blue whale Southern Indian Ocean Bioacoustics Passive acoustic monitoring Baleine bleue Océan Indien austral Bioacoustique Surveillance acoustique passive [SPI.OTHER]Engineering Sciences [physics]/Other |
description |
Blue whales (Balaenoptera musculus ssp) were brought to the brink of extinction during whaling and are still endangered today. In the southern Indian Ocean, a remote region subject to extreme weather conditions, passive acoustics quickly became the preferred method for monitoring these large marine mammals. This thesis is based on acoustic data recorded from 2010 to 2018 by a large hydrophone network in the southern Indian Ocean. An automatic detection algorithm, whose performance was thoroughly evaluated beforehand, is applied to detect the stereotyped and non-stereotyped calls (D-calls) of Antarctic blue whales and Australian and Madagascan pygmy blue whales. Detections of stereotyped calls refine the spatial and seasonal distributions previously described in the southern Indian Ocean and reveal that Antarctic and pygmy blue whales use this region in very different ways. Comparison between the geographical presence of stereotyped and nonstereotyped calls suggests a change in the acoustic behavior of blue whales between subtropical and subantarctic regions. Finally, the characterization of the southern Indian Ocean soundscape indicates that anthropogenic signals are prevalent, even in remote areas. La baleine bleue (Balaenoptera musculus ssp) a été menée au bord de l’extinction durant la chasse baleinière et est aujourd’hui toujours en danger. Dans l’océan Indien austral, une région reculée et soumise à des conditions météorologiques extrêmes, l’utilisation de l’acoustique passive s’est rapidement imposée pour le suivi de ces grands mammifères marins. Cette thèse repose sur des enregistrements acoustiques acquis de 2010 à 2018 par un réseau d’hydrophones de grande envergure situé dans l’océan Indien austral. Un algorithme de détection automatique, dont les performances sont préalablement évaluées, est appliqué pour détecter les vocalisations stéréotypées et non-stéréoptyées (D-calls) des baleines bleues Antarctique et des baleines bleues pygmées d’Australie et de Madagascar. Les détections des vocalisations ... |
author2 |
Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Jean-Yves Royer Flore Samaran |
format |
Doctoral or Postdoctoral Thesis |
author |
Torterotot, Maëlle |
author_facet |
Torterotot, Maëlle |
author_sort |
Torterotot, Maëlle |
title |
Processing and analysis of bioacoustic signals in the southern Indian Ocean |
title_short |
Processing and analysis of bioacoustic signals in the southern Indian Ocean |
title_full |
Processing and analysis of bioacoustic signals in the southern Indian Ocean |
title_fullStr |
Processing and analysis of bioacoustic signals in the southern Indian Ocean |
title_full_unstemmed |
Processing and analysis of bioacoustic signals in the southern Indian Ocean |
title_sort |
processing and analysis of bioacoustic signals in the southern indian ocean |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://theses.hal.science/tel-03372735 https://theses.hal.science/tel-03372735/document https://theses.hal.science/tel-03372735/file/These-2020-3M-Acoustique_sous_marine_et_traitement_du_signal-TORTEROTOT_Maelle.pdf |
long_lat |
ENVELOPE(140.012,140.012,-66.649,-66.649) ENVELOPE(140.015,140.015,-66.664,-66.664) ENVELOPE(141.406,141.406,-66.819,-66.819) ENVELOPE(140.012,140.012,-66.649,-66.649) |
geographic |
Antarctic Austral Baleine Baleinière Bleue Indian la Baleine |
geographic_facet |
Antarctic Austral Baleine Baleinière Bleue Indian la Baleine |
genre |
Antarc* Antarctic Antarctique* Balaenoptera musculus Baleine bleue Blue whale |
genre_facet |
Antarc* Antarctic Antarctique* Balaenoptera musculus Baleine bleue Blue whale |
op_source |
https://theses.hal.science/tel-03372735 Autre. Université de Bretagne occidentale - Brest, 2020. Français. ⟨NNT : 2020BRES0058⟩ |
op_relation |
NNT: 2020BRES0058 tel-03372735 https://theses.hal.science/tel-03372735 https://theses.hal.science/tel-03372735/document https://theses.hal.science/tel-03372735/file/These-2020-3M-Acoustique_sous_marine_et_traitement_du_signal-TORTEROTOT_Maelle.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766052418991161344 |