Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean
International audience The southern Indian Ocean is believed to be a natural territory for blue and fin whales. However, decades after commercial and illegal whaling decimated these populations, little is known about their current status, seasonal habitat or movements. Recent passive acoustic studie...
Published in: | Endangered Species Research |
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Main Authors: | , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-01902715 https://hal.univ-brest.fr/hal-01902715/document https://hal.univ-brest.fr/hal-01902715/file/n037p289.pdf https://doi.org/10.3354/esr00927 |
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ftunivnantes:oai:HAL:hal-01902715v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Pygmy blue whales Antarctic blue whales Fin whales Southern Indian Ocean Passive acoustic monitoring Sympatry [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology |
spellingShingle |
Pygmy blue whales Antarctic blue whales Fin whales Southern Indian Ocean Passive acoustic monitoring Sympatry [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Leroy, Emmanuelle C Samaran, Flore Stafford, Kate M Bonnel, Julien Royer, Jean-Yves Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean |
topic_facet |
Pygmy blue whales Antarctic blue whales Fin whales Southern Indian Ocean Passive acoustic monitoring Sympatry [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology |
description |
International audience The southern Indian Ocean is believed to be a natural territory for blue and fin whales. However, decades after commercial and illegal whaling decimated these populations, little is known about their current status, seasonal habitat or movements. Recent passive acoustic studies have described the presence of 4 acoustic populations of blue whales (Antarctic and 3 ‘pygmy’ types), but are generally limited temporally and geographically. Here, we examine up to 7 yr of continuous acoustic recordings (2010-2016) from a hydrophone network of 6 widely spaced sites in the southern Indian Ocean, looking for the presence of Antarctic and pygmy blue and fin whales. Power spectral density analyses of characteristic and distinct frequency bands of these species show seasonal and geographic differences among the different populations, and the overall patterns for each display interannual consistencies in timing and occurrence. Antarctic blue and fin whales are recorded across the hydrophone network, mainly from austral autumn to spring, with peak intensity in winter. Pygmy blue whales show spatial variation: Madagascan pygmy blue whales are mainly present in the west of the network, while the Australian call type is heard at the eastern sites. Both populations share a common seasonality, with a presence from January to June. Finally, the Sri Lankan call type is recorded only on a single site in the northeast. These results confirm the importance of the southern Indian Ocean for several populations of endangered large whales and present the first long-term assessment of fin whales in the southern Indian Ocean. |
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) Lab-STICC_ENSTAB_CID_TOMS Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC) École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom Paris (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique) Institut Mines-Télécom Paris (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom Paris (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique) Institut Mines-Télécom Paris (IMT) |
format |
Article in Journal/Newspaper |
author |
Leroy, Emmanuelle C Samaran, Flore Stafford, Kate M Bonnel, Julien Royer, Jean-Yves |
author_facet |
Leroy, Emmanuelle C Samaran, Flore Stafford, Kate M Bonnel, Julien Royer, Jean-Yves |
author_sort |
Leroy, Emmanuelle C |
title |
Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean |
title_short |
Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean |
title_full |
Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean |
title_fullStr |
Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean |
title_full_unstemmed |
Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean |
title_sort |
broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the southern indian ocean |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.univ-brest.fr/hal-01902715 https://hal.univ-brest.fr/hal-01902715/document https://hal.univ-brest.fr/hal-01902715/file/n037p289.pdf https://doi.org/10.3354/esr00927 |
geographic |
Antarctic Austral Indian |
geographic_facet |
Antarctic Austral Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 1863-5407 EISSN: 1613-4796 Endangered Species Research https://hal.univ-brest.fr/hal-01902715 Endangered Species Research, 2018, 37, pp.289-300. ⟨10.3354/esr00927⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/esr00927 hal-01902715 https://hal.univ-brest.fr/hal-01902715 https://hal.univ-brest.fr/hal-01902715/document https://hal.univ-brest.fr/hal-01902715/file/n037p289.pdf doi:10.3354/esr00927 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3354/esr00927 |
container_title |
Endangered Species Research |
container_volume |
37 |
container_start_page |
289 |
op_container_end_page |
300 |
_version_ |
1766068489367322624 |
spelling |
ftunivnantes:oai:HAL:hal-01902715v1 2023-05-15T13:35:39+02:00 Broad-scale study of the seasonal and geographic occurrence of blue and fin whales in the Southern Indian Ocean Leroy, Emmanuelle C Samaran, Flore Stafford, Kate M Bonnel, Julien Royer, Jean-Yves 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) Lab-STICC_ENSTAB_CID_TOMS Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC) École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom Paris (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique) Institut Mines-Télécom Paris (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom Paris (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique) Institut Mines-Télécom Paris (IMT) 2018-12-01 https://hal.univ-brest.fr/hal-01902715 https://hal.univ-brest.fr/hal-01902715/document https://hal.univ-brest.fr/hal-01902715/file/n037p289.pdf https://doi.org/10.3354/esr00927 en eng HAL CCSD Oldendorf/Luhe : Inter-Research info:eu-repo/semantics/altIdentifier/doi/10.3354/esr00927 hal-01902715 https://hal.univ-brest.fr/hal-01902715 https://hal.univ-brest.fr/hal-01902715/document https://hal.univ-brest.fr/hal-01902715/file/n037p289.pdf doi:10.3354/esr00927 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1863-5407 EISSN: 1613-4796 Endangered Species Research https://hal.univ-brest.fr/hal-01902715 Endangered Species Research, 2018, 37, pp.289-300. ⟨10.3354/esr00927⟩ Pygmy blue whales Antarctic blue whales Fin whales Southern Indian Ocean Passive acoustic monitoring Sympatry [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology info:eu-repo/semantics/article Journal articles 2018 ftunivnantes https://doi.org/10.3354/esr00927 2023-03-01T02:34:41Z International audience The southern Indian Ocean is believed to be a natural territory for blue and fin whales. However, decades after commercial and illegal whaling decimated these populations, little is known about their current status, seasonal habitat or movements. Recent passive acoustic studies have described the presence of 4 acoustic populations of blue whales (Antarctic and 3 ‘pygmy’ types), but are generally limited temporally and geographically. Here, we examine up to 7 yr of continuous acoustic recordings (2010-2016) from a hydrophone network of 6 widely spaced sites in the southern Indian Ocean, looking for the presence of Antarctic and pygmy blue and fin whales. Power spectral density analyses of characteristic and distinct frequency bands of these species show seasonal and geographic differences among the different populations, and the overall patterns for each display interannual consistencies in timing and occurrence. Antarctic blue and fin whales are recorded across the hydrophone network, mainly from austral autumn to spring, with peak intensity in winter. Pygmy blue whales show spatial variation: Madagascan pygmy blue whales are mainly present in the west of the network, while the Australian call type is heard at the eastern sites. Both populations share a common seasonality, with a presence from January to June. Finally, the Sri Lankan call type is recorded only on a single site in the northeast. These results confirm the importance of the southern Indian Ocean for several populations of endangered large whales and present the first long-term assessment of fin whales in the southern Indian Ocean. Article in Journal/Newspaper Antarc* Antarctic Université de Nantes: HAL-UNIV-NANTES Antarctic Austral Indian Endangered Species Research 37 289 300 |