Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean
Understanding the seasonal movements and distribution patterns of migratory species over ocean basin scales is vital for appropriate conservation and management measures. However, assessing populations over remote regions is challenging, particularly if they are rare. Blue whales (Balaenoptera muscu...
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fttriple:oai:gotriple.eu:10670/1.bdubtm 2023-05-15T14:02:32+02:00 Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean Samaran, Flore Stafford, Kathleen M. Branch, Trevor A. Gedamke, Jason Royer, Jean-yves Dziak, Robert P. Guinet, Christophe https://doi.org/10.1371/journal.pone.0071561 https://archimer.ifremer.fr/doc/00274/38490/36960.pdf https://archimer.ifremer.fr/doc/00274/38490/ en eng Public Library Science doi:10.1371/journal.pone.0071561 10670/1.bdubtm https://archimer.ifremer.fr/doc/00274/38490/36960.pdf https://archimer.ifremer.fr/doc/00274/38490/ lic_creative-commons other Archimer, archive institutionnelle de l'Ifremer Plos One (1932-6203) (Public Library Science), 2013-08 , Vol. 8 , N. 8 , P. e71561 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1371/journal.pone.0071561 2023-01-22T18:25:06Z Understanding the seasonal movements and distribution patterns of migratory species over ocean basin scales is vital for appropriate conservation and management measures. However, assessing populations over remote regions is challenging, particularly if they are rare. Blue whales (Balaenoptera musculus spp) are an endangered species found in the Southern and Indian Oceans. Here two recognized subspecies of blue whales and, based on passive acoustic monitoring, four "acoustic populations" occur. Three of these are pygmy blue whale (B. m. brevicauda) populations while the fourth is the Antarctic blue whale (B. m. intermedia). Past whaling catches have dramatically reduced their numbers but recent acoustic recordings show that these oceans are still important habitat for blue whales. Presently little is known about the seasonal movements and degree of overlap of these four populations, particularly in the central Indian Ocean. We examined the geographic and seasonal occurrence of different blue whale acoustic populations using one year of passive acoustic recording from three sites located at different latitudes in the Indian Ocean. The vocalizations of the different blue whale subspecies and acoustic populations were recorded seasonally in different regions. For some call types and locations, there was spatial and temporal overlap, particularly between Antarctic and different pygmy blue whale acoustic populations. Except on the southernmost hydrophone, all three pygmy blue whale acoustic populations were found at different sites or during different seasons, which further suggests that these populations are generally geographically distinct. This unusual blue whale diversity in sub-Antarctic and sub-tropical waters indicates the importance of the area for blue whales in these former whaling grounds. Text Antarc* Antarctic Balaenoptera musculus Blue whale Unknown Antarctic Indian The Antarctic PLoS ONE 8 8 e71561 |
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geo envir Samaran, Flore Stafford, Kathleen M. Branch, Trevor A. Gedamke, Jason Royer, Jean-yves Dziak, Robert P. Guinet, Christophe Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean |
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Understanding the seasonal movements and distribution patterns of migratory species over ocean basin scales is vital for appropriate conservation and management measures. However, assessing populations over remote regions is challenging, particularly if they are rare. Blue whales (Balaenoptera musculus spp) are an endangered species found in the Southern and Indian Oceans. Here two recognized subspecies of blue whales and, based on passive acoustic monitoring, four "acoustic populations" occur. Three of these are pygmy blue whale (B. m. brevicauda) populations while the fourth is the Antarctic blue whale (B. m. intermedia). Past whaling catches have dramatically reduced their numbers but recent acoustic recordings show that these oceans are still important habitat for blue whales. Presently little is known about the seasonal movements and degree of overlap of these four populations, particularly in the central Indian Ocean. We examined the geographic and seasonal occurrence of different blue whale acoustic populations using one year of passive acoustic recording from three sites located at different latitudes in the Indian Ocean. The vocalizations of the different blue whale subspecies and acoustic populations were recorded seasonally in different regions. For some call types and locations, there was spatial and temporal overlap, particularly between Antarctic and different pygmy blue whale acoustic populations. Except on the southernmost hydrophone, all three pygmy blue whale acoustic populations were found at different sites or during different seasons, which further suggests that these populations are generally geographically distinct. This unusual blue whale diversity in sub-Antarctic and sub-tropical waters indicates the importance of the area for blue whales in these former whaling grounds. |
format |
Text |
author |
Samaran, Flore Stafford, Kathleen M. Branch, Trevor A. Gedamke, Jason Royer, Jean-yves Dziak, Robert P. Guinet, Christophe |
author_facet |
Samaran, Flore Stafford, Kathleen M. Branch, Trevor A. Gedamke, Jason Royer, Jean-yves Dziak, Robert P. Guinet, Christophe |
author_sort |
Samaran, Flore |
title |
Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean |
title_short |
Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean |
title_full |
Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean |
title_fullStr |
Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean |
title_full_unstemmed |
Seasonal and Geographic Variation of Southern Blue Whale Subspecies in the Indian Ocean |
title_sort |
seasonal and geographic variation of southern blue whale subspecies in the indian ocean |
publisher |
Public Library Science |
url |
https://doi.org/10.1371/journal.pone.0071561 https://archimer.ifremer.fr/doc/00274/38490/36960.pdf https://archimer.ifremer.fr/doc/00274/38490/ |
geographic |
Antarctic Indian The Antarctic |
geographic_facet |
Antarctic Indian The Antarctic |
genre |
Antarc* Antarctic Balaenoptera musculus Blue whale |
genre_facet |
Antarc* Antarctic Balaenoptera musculus Blue whale |
op_source |
Archimer, archive institutionnelle de l'Ifremer Plos One (1932-6203) (Public Library Science), 2013-08 , Vol. 8 , N. 8 , P. e71561 |
op_relation |
doi:10.1371/journal.pone.0071561 10670/1.bdubtm https://archimer.ifremer.fr/doc/00274/38490/36960.pdf https://archimer.ifremer.fr/doc/00274/38490/ |
op_rights |
lic_creative-commons other |
op_doi |
https://doi.org/10.1371/journal.pone.0071561 |
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PLoS ONE |
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8 |
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8 |
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e71561 |
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