Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa
Killer whales Orcinus orca are considered to be relatively uncommon in tropical waters. Few sightings have been reported from the west coast of Africa due to a paucity of survey coverage. We present data on 32 killer sightings from tropical waters off Angola (N = 18), Gabon (N = 7), São Tomé (N = 6)...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2010
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s002531541000072x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002531541000072X |
id |
crcambridgeupr:10.1017/s002531541000072x |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s002531541000072x 2024-09-30T14:38:25+00:00 Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa Weir, Caroline R Collins, Tim Carvalho, Inês Rosenbaum, Howard C. 2010 http://dx.doi.org/10.1017/s002531541000072x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002531541000072X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 90, issue 8, page 1601-1611 ISSN 0025-3154 1469-7769 journal-article 2010 crcambridgeupr https://doi.org/10.1017/s002531541000072x 2024-09-04T04:04:23Z Killer whales Orcinus orca are considered to be relatively uncommon in tropical waters. Few sightings have been reported from the west coast of Africa due to a paucity of survey coverage. We present data on 32 killer sightings from tropical waters off Angola (N = 18), Gabon (N = 7), São Tomé (N = 6) and Cameroon (N = 1), comprising a combination of dedicated survey sightings (N = 21) and reliable anecdotal records ( n = 11). Killer whales were reported from coastal waters, the shelf edge and deep, oceanic areas. Sightings indicate a probable year-round occurrence of killer whales within the region. Mean group size was 5.6 animals. There was no difference in group size between sightings in waters >200 m deep and those on the continental shelf. No photo-identification matches were found between Angola, Gabon and São Tomé. Re-sightings of two individuals occurred annually in São Tomé during 2002–2004. Killer whales had external appearance consistent with the Type A nominate species form. Antagonistic encounters were recorded between killer whales and humpback whales Megaptera novaeangliae off Angola, Gabon and Cameroon, and with sperm whales Physeter macrocephalus off Angola. Predation on ocean sunfish Mola mola was recorded in São Tomé, and possible predation on sharks was recorded twice in Gabon. Article in Journal/Newspaper Megaptera novaeangliae Orca Orcinus orca Physeter macrocephalus Cambridge University Press Journal of the Marine Biological Association of the United Kingdom 90 8 1601 1611 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Killer whales Orcinus orca are considered to be relatively uncommon in tropical waters. Few sightings have been reported from the west coast of Africa due to a paucity of survey coverage. We present data on 32 killer sightings from tropical waters off Angola (N = 18), Gabon (N = 7), São Tomé (N = 6) and Cameroon (N = 1), comprising a combination of dedicated survey sightings (N = 21) and reliable anecdotal records ( n = 11). Killer whales were reported from coastal waters, the shelf edge and deep, oceanic areas. Sightings indicate a probable year-round occurrence of killer whales within the region. Mean group size was 5.6 animals. There was no difference in group size between sightings in waters >200 m deep and those on the continental shelf. No photo-identification matches were found between Angola, Gabon and São Tomé. Re-sightings of two individuals occurred annually in São Tomé during 2002–2004. Killer whales had external appearance consistent with the Type A nominate species form. Antagonistic encounters were recorded between killer whales and humpback whales Megaptera novaeangliae off Angola, Gabon and Cameroon, and with sperm whales Physeter macrocephalus off Angola. Predation on ocean sunfish Mola mola was recorded in São Tomé, and possible predation on sharks was recorded twice in Gabon. |
format |
Article in Journal/Newspaper |
author |
Weir, Caroline R Collins, Tim Carvalho, Inês Rosenbaum, Howard C. |
spellingShingle |
Weir, Caroline R Collins, Tim Carvalho, Inês Rosenbaum, Howard C. Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa |
author_facet |
Weir, Caroline R Collins, Tim Carvalho, Inês Rosenbaum, Howard C. |
author_sort |
Weir, Caroline R |
title |
Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa |
title_short |
Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa |
title_full |
Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa |
title_fullStr |
Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa |
title_full_unstemmed |
Killer whales ( Orcinus orca) in Angolan and Gulf of Guinea waters, tropical West Africa |
title_sort |
killer whales ( orcinus orca) in angolan and gulf of guinea waters, tropical west africa |
publisher |
Cambridge University Press (CUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1017/s002531541000072x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002531541000072X |
genre |
Megaptera novaeangliae Orca Orcinus orca Physeter macrocephalus |
genre_facet |
Megaptera novaeangliae Orca Orcinus orca Physeter macrocephalus |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 90, issue 8, page 1601-1611 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s002531541000072x |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
90 |
container_issue |
8 |
container_start_page |
1601 |
op_container_end_page |
1611 |
_version_ |
1811641070494154752 |