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...
Published in: | Endangered Species Research |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2010
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00529648 https://doi.org/10.3354/esr00302 |
id |
ftccsdartic:oai:HAL:hal-00529648v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00529648v1 2023-05-15T13:44:36+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://hal.archives-ouvertes.fr/hal-00529648 https://doi.org/10.3354/esr00302 en eng HAL CCSD Oldendorf/Luhe : Inter-Research info:eu-repo/semantics/altIdentifier/doi/10.3354/esr00302 hal-00529648 https://hal.archives-ouvertes.fr/hal-00529648 doi:10.3354/esr00302 ISSN: 1863-5407 EISSN: 1613-4796 Endangered Species Research https://hal.archives-ouvertes.fr/hal-00529648 Endangered Species Research, Oldendorf/Luhe : Inter-Research, 2010, 12, pp.157-165. ⟨10.3354/esr00302⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.3354/esr00302 2021-05-02T00:22:04Z 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Austral Indian Endangered Species Research 12 2 157 165 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Samaran, Flore Adam, Olivier Guinet, Christophe Discovery of a mid-latitude sympatric area for two Southern Hemisphere blue whale subspecies |
topic_facet |
[SDE]Environmental Sciences |
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://hal.archives-ouvertes.fr/hal-00529648 https://doi.org/10.3354/esr00302 |
geographic |
Antarctic The Antarctic Austral Indian |
geographic_facet |
Antarctic The Antarctic Austral Indian |
genre |
Antarc* Antarctic Balaenoptera musculus Blue whale Crozet Islands |
genre_facet |
Antarc* Antarctic Balaenoptera musculus Blue whale Crozet Islands |
op_source |
ISSN: 1863-5407 EISSN: 1613-4796 Endangered Species Research https://hal.archives-ouvertes.fr/hal-00529648 Endangered Species Research, Oldendorf/Luhe : Inter-Research, 2010, 12, pp.157-165. ⟨10.3354/esr00302⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/esr00302 hal-00529648 https://hal.archives-ouvertes.fr/hal-00529648 doi:10.3354/esr00302 |
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 |
_version_ |
1766203963555708928 |