Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies
International audience In the Southern Indian Ocean, 2 subspecies of blue whales Balaenoptera musculus spp. occur, the Antarctic B. m. intermedia and the pygmy blue whale B. m. brevicauda. Until the present study was conducted it was assumed that the distribution of these 2 subspecies was delimited...
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fttriple:oai:gotriple.eu:10670/1.hgywzi 2023-05-15T13:46:29+02:00 Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies Samaran, Flore Adam, Olivier Guinet, Christophe Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2010-10-26 https://doi.org/10.3354/esr00302 https://hal.archives-ouvertes.fr/hal-00529648 en eng HAL CCSD Oldendorf/Luhe : Inter-Research hal-00529648 doi:10.3354/esr00302 10670/1.hgywzi https://hal.archives-ouvertes.fr/hal-00529648 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1863-5407 EISSN: 1613-4796 Endangered Species Research Endangered Species Research, Oldendorf/Luhe : Inter-Research, 2010, 12, pp.157-165. ⟨10.3354/esr00302⟩ geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2010 fttriple https://doi.org/10.3354/esr00302 2023-01-22T18:34:00Z International audience In the Southern Indian Ocean, 2 subspecies of blue whales Balaenoptera musculus spp. occur, the Antarctic B. m. intermedia and the pygmy blue whale B. m. brevicauda. Until the present study was conducted it was assumed that the distribution of these 2 subspecies was delimited by the Antarctic Convergence (52° to 56° S) during the austral summer. Here, we report results from the first year-long, continuous acoustic monitoring of blue whales in mid-latitude waters off the Crozet Islands (46° 25' S, 51° 40' E). Using acoustic data from an International Monitoring System hydroacoustic station, we found that Antarctic and pygmy blue whales occur sympatrically in this area based on detection of their stereotyped calls. Antarctic blue whale calls were recorded year-round, indicating continuous presence in the region, which contradicts the migration paradigm attributed to this subspecies. Three geographically distinct types of pygmy blue whale calls were recorded during the summer and autumn only. The Madagascan call type was the most frequently recorded, while Sri Lankan and Australian call types recorded in this area suggest basin-scale longitudinal and latitudinal movements. During spring and summer, blue whale calls were often associated with higher frequency sounds (D calls), which have been attributed to feeding activity. The summer co-occurrence of blue whale subspecies highlights the importance of this productive sub-Antarctic area as a blue whale hotspot and provides new insights into blue whale seasonal distribution and segregation. Article in Journal/Newspaper Antarc* Antarctic Balaenoptera musculus Blue whale Crozet Islands Unknown Antarctic Austral Indian The Antarctic Endangered Species Research 12 2 157 165 |
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Unknown |
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English |
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geo envir Samaran, Flore Adam, Olivier Guinet, Christophe Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
topic_facet |
geo envir |
description |
International audience In the Southern Indian Ocean, 2 subspecies of blue whales Balaenoptera musculus spp. occur, the Antarctic B. m. intermedia and the pygmy blue whale B. m. brevicauda. Until the present study was conducted it was assumed that the distribution of these 2 subspecies was delimited by the Antarctic Convergence (52° to 56° S) during the austral summer. Here, we report results from the first year-long, continuous acoustic monitoring of blue whales in mid-latitude waters off the Crozet Islands (46° 25' S, 51° 40' E). Using acoustic data from an International Monitoring System hydroacoustic station, we found that Antarctic and pygmy blue whales occur sympatrically in this area based on detection of their stereotyped calls. Antarctic blue whale calls were recorded year-round, indicating continuous presence in the region, which contradicts the migration paradigm attributed to this subspecies. Three geographically distinct types of pygmy blue whale calls were recorded during the summer and autumn only. The Madagascan call type was the most frequently recorded, while Sri Lankan and Australian call types recorded in this area suggest basin-scale longitudinal and latitudinal movements. During spring and summer, blue whale calls were often associated with higher frequency sounds (D calls), which have been attributed to feeding activity. The summer co-occurrence of blue whale subspecies highlights the importance of this productive sub-Antarctic area as a blue whale hotspot and provides new insights into blue whale seasonal distribution and segregation. |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Samaran, Flore Adam, Olivier Guinet, Christophe |
author_facet |
Samaran, Flore Adam, Olivier Guinet, Christophe |
author_sort |
Samaran, Flore |
title |
Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
title_short |
Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
title_full |
Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
title_fullStr |
Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
title_full_unstemmed |
Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
title_sort |
discovery of a mid-latitude sympatric area for two southern hemisphere blue whale subspecies |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://doi.org/10.3354/esr00302 https://hal.archives-ouvertes.fr/hal-00529648 |
geographic |
Antarctic Austral Indian The Antarctic |
geographic_facet |
Antarctic Austral Indian The Antarctic |
genre |
Antarc* Antarctic Balaenoptera musculus Blue whale Crozet Islands |
genre_facet |
Antarc* Antarctic Balaenoptera musculus Blue whale Crozet Islands |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1863-5407 EISSN: 1613-4796 Endangered Species Research Endangered Species Research, Oldendorf/Luhe : Inter-Research, 2010, 12, pp.157-165. ⟨10.3354/esr00302⟩ |
op_relation |
hal-00529648 doi:10.3354/esr00302 10670/1.hgywzi https://hal.archives-ouvertes.fr/hal-00529648 |
op_rights |
undefined |
op_doi |
https://doi.org/10.3354/esr00302 |
container_title |
Endangered Species Research |
container_volume |
12 |
container_issue |
2 |
container_start_page |
157 |
op_container_end_page |
165 |
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1766243262232788992 |