Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean
1. Blue whale locations in the Southern Hemisphere and northern Indian Ocean were obtained from catches (303 239), sightings (4383 records of 8058 whales), strandings (103), Discovery marks (2191) and recoveries (95), and acoustic recordings. 2. Sighting surveys included 7 480 450 km of effort plus...
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Format: | Article in Journal/Newspaper |
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2007
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Online Access: | http://hdl.handle.net/11427/17298 https://open.uct.ac.za/bitstream/11427/17298/1/Branch_Pastpresent_2007.pdf |
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ftunivcapetownir:oai:localhost:11427/17298 2023-05-15T13:46:02+02:00 Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean Branch, Trevor A Stafford, K M Palacios, D M Allison, C Bannister, J L Burton, C L K Cabrera, E Carlson, C A Galletti Vernazzani, B Gill, P C Hucke-Gaete, R Jenner, K C S Jenner, M N M Matsuoka, K Mikhalev, Y A Miyashita, T Morrice, M G Nishiwaki, S Sturrock, V J Tormosov, D Anderson, R C Baker, A N Best, P D Borsa, P Brownell Jr, R I Childerhouse, S Findlay, K P Gerrodette, T Ilangakoon, A D Joergensen, M Kahn, B Ljungblad, D K Maughan, B Mccauley, R D Mckay, S Norris, T F Oman Whale and Dolphin Research Group Rankin, S Samaran, F Thiele, D van Waerebeek, K Warneke, R M 2007 application/pdf http://hdl.handle.net/11427/17298 https://open.uct.ac.za/bitstream/11427/17298/1/Branch_Pastpresent_2007.pdf eng eng Wiley University of Cape Town Faculty of Science Marine Resource Assessment and Management Group http://hdl.handle.net/11427/17298 https://open.uct.ac.za/bitstream/11427/17298/1/Branch_Pastpresent_2007.pdf Mammal Review http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2907 Antarctic blue whales Balaenoptera musculus brevicauda Balaenoptera musculus indica Journal Article 2007 ftunivcapetownir https://doi.org/10.1111/(ISSN)1365-2907 2022-09-13T05:56:59Z 1. Blue whale locations in the Southern Hemisphere and northern Indian Ocean were obtained from catches (303 239), sightings (4383 records of 8058 whales), strandings (103), Discovery marks (2191) and recoveries (95), and acoustic recordings. 2. Sighting surveys included 7 480 450 km of effort plus 14 676 days with unmeasured effort. Groups usually consisted of solitary whales (65.2%) or pairs (24.6%); larger feeding aggregations of unassociated individuals were only rarely observed. Sighting rates (groups per 1000 km from many platform types) varied by four orders of magnitude and were lowest in the waters of Brazil, South Africa, the eastern tropical Pacific, Antarctica and South Georgia; higher in the Subantarctic and Peru; and highest around Indonesia, Sri Lanka, Chile, southern Australia and south of Madagascar. 3. Blue whales avoid the oligotrophic central gyres of the Indian, Pacific and Atlantic Oceans, but are more common where phytoplankton densities are high, and where there are dynamic oceanographic processes like upwelling and frontal meandering. 4. Compared with historical catches, the Antarctic (‘true’) subspecies is exceedingly rare and usually concentrated closer to the summer pack ice. In summer they are found throughout the Antarctic; in winter they migrate to southern Africa (although recent sightings there are rare) and to other northerly locations (based on acoustics), although some overwinter in the Antarctic. 5. Pygmy blue whales are found around the Indian Ocean and from southern Australia to New Zealand. At least four groupings are evident: northern Indian Ocean, from Madagascar to the Subantarctic, Indonesia to western and southern Australia, and from New Zealand northwards to the equator. Sighting rates are typically much higher than for Antarctic blue whales. Article in Journal/Newspaper Antarc* Antarctic Antarctica Balaenoptera musculus Blue whale University of Cape Town: OpenUCT Antarctic Indian New Zealand Pacific The Antarctic Mammal Review |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Antarctic blue whales Balaenoptera musculus brevicauda Balaenoptera musculus indica |
spellingShingle |
Antarctic blue whales Balaenoptera musculus brevicauda Balaenoptera musculus indica Branch, Trevor A Stafford, K M Palacios, D M Allison, C Bannister, J L Burton, C L K Cabrera, E Carlson, C A Galletti Vernazzani, B Gill, P C Hucke-Gaete, R Jenner, K C S Jenner, M N M Matsuoka, K Mikhalev, Y A Miyashita, T Morrice, M G Nishiwaki, S Sturrock, V J Tormosov, D Anderson, R C Baker, A N Best, P D Borsa, P Brownell Jr, R I Childerhouse, S Findlay, K P Gerrodette, T Ilangakoon, A D Joergensen, M Kahn, B Ljungblad, D K Maughan, B Mccauley, R D Mckay, S Norris, T F Oman Whale and Dolphin Research Group Rankin, S Samaran, F Thiele, D van Waerebeek, K Warneke, R M Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean |
topic_facet |
Antarctic blue whales Balaenoptera musculus brevicauda Balaenoptera musculus indica |
description |
1. Blue whale locations in the Southern Hemisphere and northern Indian Ocean were obtained from catches (303 239), sightings (4383 records of 8058 whales), strandings (103), Discovery marks (2191) and recoveries (95), and acoustic recordings. 2. Sighting surveys included 7 480 450 km of effort plus 14 676 days with unmeasured effort. Groups usually consisted of solitary whales (65.2%) or pairs (24.6%); larger feeding aggregations of unassociated individuals were only rarely observed. Sighting rates (groups per 1000 km from many platform types) varied by four orders of magnitude and were lowest in the waters of Brazil, South Africa, the eastern tropical Pacific, Antarctica and South Georgia; higher in the Subantarctic and Peru; and highest around Indonesia, Sri Lanka, Chile, southern Australia and south of Madagascar. 3. Blue whales avoid the oligotrophic central gyres of the Indian, Pacific and Atlantic Oceans, but are more common where phytoplankton densities are high, and where there are dynamic oceanographic processes like upwelling and frontal meandering. 4. Compared with historical catches, the Antarctic (‘true’) subspecies is exceedingly rare and usually concentrated closer to the summer pack ice. In summer they are found throughout the Antarctic; in winter they migrate to southern Africa (although recent sightings there are rare) and to other northerly locations (based on acoustics), although some overwinter in the Antarctic. 5. Pygmy blue whales are found around the Indian Ocean and from southern Australia to New Zealand. At least four groupings are evident: northern Indian Ocean, from Madagascar to the Subantarctic, Indonesia to western and southern Australia, and from New Zealand northwards to the equator. Sighting rates are typically much higher than for Antarctic blue whales. |
format |
Article in Journal/Newspaper |
author |
Branch, Trevor A Stafford, K M Palacios, D M Allison, C Bannister, J L Burton, C L K Cabrera, E Carlson, C A Galletti Vernazzani, B Gill, P C Hucke-Gaete, R Jenner, K C S Jenner, M N M Matsuoka, K Mikhalev, Y A Miyashita, T Morrice, M G Nishiwaki, S Sturrock, V J Tormosov, D Anderson, R C Baker, A N Best, P D Borsa, P Brownell Jr, R I Childerhouse, S Findlay, K P Gerrodette, T Ilangakoon, A D Joergensen, M Kahn, B Ljungblad, D K Maughan, B Mccauley, R D Mckay, S Norris, T F Oman Whale and Dolphin Research Group Rankin, S Samaran, F Thiele, D van Waerebeek, K Warneke, R M |
author_facet |
Branch, Trevor A Stafford, K M Palacios, D M Allison, C Bannister, J L Burton, C L K Cabrera, E Carlson, C A Galletti Vernazzani, B Gill, P C Hucke-Gaete, R Jenner, K C S Jenner, M N M Matsuoka, K Mikhalev, Y A Miyashita, T Morrice, M G Nishiwaki, S Sturrock, V J Tormosov, D Anderson, R C Baker, A N Best, P D Borsa, P Brownell Jr, R I Childerhouse, S Findlay, K P Gerrodette, T Ilangakoon, A D Joergensen, M Kahn, B Ljungblad, D K Maughan, B Mccauley, R D Mckay, S Norris, T F Oman Whale and Dolphin Research Group Rankin, S Samaran, F Thiele, D van Waerebeek, K Warneke, R M |
author_sort |
Branch, Trevor A |
title |
Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean |
title_short |
Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean |
title_full |
Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean |
title_fullStr |
Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean |
title_full_unstemmed |
Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean |
title_sort |
past and present distribution, densities and movements of blue whales balaenoptera musculus in the southern hemisphere and northern indian ocean |
publisher |
Wiley |
publishDate |
2007 |
url |
http://hdl.handle.net/11427/17298 https://open.uct.ac.za/bitstream/11427/17298/1/Branch_Pastpresent_2007.pdf |
geographic |
Antarctic Indian New Zealand Pacific The Antarctic |
geographic_facet |
Antarctic Indian New Zealand Pacific The Antarctic |
genre |
Antarc* Antarctic Antarctica Balaenoptera musculus Blue whale |
genre_facet |
Antarc* Antarctic Antarctica Balaenoptera musculus Blue whale |
op_source |
Mammal Review http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2907 |
op_relation |
http://hdl.handle.net/11427/17298 https://open.uct.ac.za/bitstream/11427/17298/1/Branch_Pastpresent_2007.pdf |
op_doi |
https://doi.org/10.1111/(ISSN)1365-2907 |
container_title |
Mammal Review |
_version_ |
1766235351498620928 |