Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean
The Southeast Pacific (SEP) or Chilean blue whale population is largely distributed between Northern Chilean Patagonia and the Eastern Tropical Pacific. Off South Georgia (SG), the majority of blue whales caught were Antarctic blue whales, but recent genetic and acoustic records indicate the possibl...
Published in: | Marine Mammal Science |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/532817/ https://onlinelibrary.wiley.com/doi/10.1111/mms.12946 |
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ftnerc:oai:nora.nerc.ac.uk:532817 2023-12-10T09:42:51+01:00 Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean Rojas‐Cerda, Constanza Buchan, Susannah J. Branch, Trevor A. Malige, Franck Patris, Julie Hucke‐Gaete, Rodrigo Staniland, Iain 2022-10-10 http://nora.nerc.ac.uk/id/eprint/532817/ https://onlinelibrary.wiley.com/doi/10.1111/mms.12946 unknown Wiley Rojas‐Cerda, Constanza; Buchan, Susannah J.; Branch, Trevor A.; Malige, Franck; Patris, Julie; Hucke‐Gaete, Rodrigo; Staniland, Iain orcid:0000-0003-2736-9134 . 2022 Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean. Marine Mammal Science, 38 (4). 1425-1441. https://doi.org/10.1111/mms.12946 <https://doi.org/10.1111/mms.12946> Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1111/mms.12946 2023-11-10T00:03:07Z The Southeast Pacific (SEP) or Chilean blue whale population is largely distributed between Northern Chilean Patagonia and the Eastern Tropical Pacific. Off South Georgia (SG), the majority of blue whales caught were Antarctic blue whales, but recent genetic and acoustic records indicate the possible presence of SEP individuals. To assess the presence of SEP blue whales off SG, we carried out new analyses of acoustic data previously reported as containing pygmy blue whale song and analyzed the length frequencies from 20th century catch data. The month of acoustic data reported to contain the presumed pygmy blue whale song was examined (August 2006), and 13 days were found to have songs which visually and quantitatively matched SEP2 songs from Northern Chilean Patagonia. The fundamental frequency of SEP2 song off SG, however, was not in line with the predicted frequency shift trend of the SEP2 songs in the SEP. A mixture analysis of lengths in historic whaling catches indicated that 3.3% of the catches from SG could be SEP blue whales, although this declined to 0.6%, 95% CI [0.0, 2.6] when fit to nonrounded lengths. Our results suggest that any SEP blue whales off SG are likely rare vagrants, at the edge of an endangered population. Article in Journal/Newspaper Antarc* Antarctic Balaenoptera musculus Blue whale South Atlantic Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Patagonia Pacific Marine Mammal Science |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
The Southeast Pacific (SEP) or Chilean blue whale population is largely distributed between Northern Chilean Patagonia and the Eastern Tropical Pacific. Off South Georgia (SG), the majority of blue whales caught were Antarctic blue whales, but recent genetic and acoustic records indicate the possible presence of SEP individuals. To assess the presence of SEP blue whales off SG, we carried out new analyses of acoustic data previously reported as containing pygmy blue whale song and analyzed the length frequencies from 20th century catch data. The month of acoustic data reported to contain the presumed pygmy blue whale song was examined (August 2006), and 13 days were found to have songs which visually and quantitatively matched SEP2 songs from Northern Chilean Patagonia. The fundamental frequency of SEP2 song off SG, however, was not in line with the predicted frequency shift trend of the SEP2 songs in the SEP. A mixture analysis of lengths in historic whaling catches indicated that 3.3% of the catches from SG could be SEP blue whales, although this declined to 0.6%, 95% CI [0.0, 2.6] when fit to nonrounded lengths. Our results suggest that any SEP blue whales off SG are likely rare vagrants, at the edge of an endangered population. |
format |
Article in Journal/Newspaper |
author |
Rojas‐Cerda, Constanza Buchan, Susannah J. Branch, Trevor A. Malige, Franck Patris, Julie Hucke‐Gaete, Rodrigo Staniland, Iain |
spellingShingle |
Rojas‐Cerda, Constanza Buchan, Susannah J. Branch, Trevor A. Malige, Franck Patris, Julie Hucke‐Gaete, Rodrigo Staniland, Iain Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean |
author_facet |
Rojas‐Cerda, Constanza Buchan, Susannah J. Branch, Trevor A. Malige, Franck Patris, Julie Hucke‐Gaete, Rodrigo Staniland, Iain |
author_sort |
Rojas‐Cerda, Constanza |
title |
Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean |
title_short |
Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean |
title_full |
Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean |
title_fullStr |
Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean |
title_full_unstemmed |
Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean |
title_sort |
presence of southeast pacific blue whales (balaenoptera musculus) off south georgia in the south atlantic ocean |
publisher |
Wiley |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/532817/ https://onlinelibrary.wiley.com/doi/10.1111/mms.12946 |
geographic |
Antarctic Patagonia Pacific |
geographic_facet |
Antarctic Patagonia Pacific |
genre |
Antarc* Antarctic Balaenoptera musculus Blue whale South Atlantic Ocean |
genre_facet |
Antarc* Antarctic Balaenoptera musculus Blue whale South Atlantic Ocean |
op_relation |
Rojas‐Cerda, Constanza; Buchan, Susannah J.; Branch, Trevor A.; Malige, Franck; Patris, Julie; Hucke‐Gaete, Rodrigo; Staniland, Iain orcid:0000-0003-2736-9134 . 2022 Presence of Southeast Pacific blue whales (Balaenoptera musculus) off South Georgia in the South Atlantic Ocean. Marine Mammal Science, 38 (4). 1425-1441. https://doi.org/10.1111/mms.12946 <https://doi.org/10.1111/mms.12946> |
op_doi |
https://doi.org/10.1111/mms.12946 |
container_title |
Marine Mammal Science |
_version_ |
1784885882086490112 |