Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica
Killer whales (KWs) are apex marine predators. In Antarctica, they have diverse trophic interactions and belong to five ecotypes that have differences in morphology, ecology, and acoustic repertoire. Around the Antarctic Peninsula (AP), two sympatric forms of Type B KWs are the most common. They hav...
Published in: | Theriologia Ukrainica |
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National Academy of Sciences of Ukraine. National Museum of Natural History
2022
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ftdoajarticles:oai:doaj.org/article:bf2e047b7bc04334b4e5b0c1c51cbce6 2023-05-15T14:01:11+02:00 Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica Оksana Savenko 2022-12-01T00:00:00Z https://doi.org/10.15407/TU2417 https://doaj.org/article/bf2e047b7bc04334b4e5b0c1c51cbce6 EN UK eng ukr National Academy of Sciences of Ukraine. National Museum of Natural History http://terioshkola.org.ua/library/pts24/TU2417-savenko.htm https://doaj.org/toc/2616-7379 https://doaj.org/toc/2617-1120 doi:10.15407/TU2417 2616-7379 2617-1120 https://doaj.org/article/bf2e047b7bc04334b4e5b0c1c51cbce6 Theriologia Ukrainica, Vol 24, Pp 210-215 (2022) orcinus orca ecotypes winter sightings west antarctic peninsula Zoology QL1-991 article 2022 ftdoajarticles https://doi.org/10.15407/TU2417 2023-02-12T01:28:53Z Killer whales (KWs) are apex marine predators. In Antarctica, they have diverse trophic interactions and belong to five ecotypes that have differences in morphology, ecology, and acoustic repertoire. Around the Antarctic Peninsula (AP), two sympatric forms of Type B KWs are the most common. They have similar pigmentation patterns, but a larger form has been observed to feed mainly on seals (B1), and a smaller form feed on Pygoscelis penguins (B2). The waters of the West AP are experiencing ecosystem transformations caused by climate change at one of the fastest rates on Earth. Little is known about the austral winter distribution and ecology of KWs in this changing environment. The purpose of the study was to reveal the winter distribution and ecology patterns of KWs in the waters of the Wilhelm Archipelago. Boat-based visual observations and photo-identification were performed. The boat cruises were conducted within 14 nm of the Ukrainian Akademik Vernadsky Research Station, Galindez Island. In 2019, 10 surveys of a total of 194 nm were conducted, and in 2021 – 37 surveys of 605 nm. During both winters, three groups of KWs were recorded. A group of 7 KWs was encountered on 27 June 2019 near Hovgaard and Pleneau islands. It consisted of adults of both sexes and juveniles. In the same area, on 13 July 2021, another group of KWs was observed, consisting of at least 5 individuals (up to 7): 1 adult male, 2 adult females, a calf, and a juvenile of unknown sex. According to the external morphology patterns, it was determined that both groups belong to Type B, most likely of a smaller form (B1). Large gatherings of Pygoscelis penguins were observed in this area during both winters. On 22 July 2021, a group of KWs consisting of 2 adult males was observed in the Penola Strait. Observations of their joint feeding on a crabeater seal were performed. According to morphology and behaviour, they belong to the ecotype B2. As Antarctic krill move inshore during winter, penguins and crabeater seals likely took advantage of ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Antarctica Crabeater Seal Crabeater Seals Galindez Island Orca Orcinus orca West Antarctica Wilhelm Archipelago Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula Austral West Antarctica Galindez ENVELOPE(-64.248,-64.248,-65.250,-65.250) Galindez Island ENVELOPE(-64.267,-64.267,-65.250,-65.250) Hovgaard ENVELOPE(-64.133,-64.133,-65.133,-65.133) Wilhelm Archipelago ENVELOPE(-64.000,-64.000,-65.133,-65.133) Penola ENVELOPE(-64.127,-64.127,-65.193,-65.193) Penola Strait ENVELOPE(-64.133,-64.133,-65.183,-65.183) Theriologia Ukrainica 2022 24 210 215 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Ukrainian |
topic |
orcinus orca ecotypes winter sightings west antarctic peninsula Zoology QL1-991 |
spellingShingle |
orcinus orca ecotypes winter sightings west antarctic peninsula Zoology QL1-991 Оksana Savenko Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica |
topic_facet |
orcinus orca ecotypes winter sightings west antarctic peninsula Zoology QL1-991 |
description |
Killer whales (KWs) are apex marine predators. In Antarctica, they have diverse trophic interactions and belong to five ecotypes that have differences in morphology, ecology, and acoustic repertoire. Around the Antarctic Peninsula (AP), two sympatric forms of Type B KWs are the most common. They have similar pigmentation patterns, but a larger form has been observed to feed mainly on seals (B1), and a smaller form feed on Pygoscelis penguins (B2). The waters of the West AP are experiencing ecosystem transformations caused by climate change at one of the fastest rates on Earth. Little is known about the austral winter distribution and ecology of KWs in this changing environment. The purpose of the study was to reveal the winter distribution and ecology patterns of KWs in the waters of the Wilhelm Archipelago. Boat-based visual observations and photo-identification were performed. The boat cruises were conducted within 14 nm of the Ukrainian Akademik Vernadsky Research Station, Galindez Island. In 2019, 10 surveys of a total of 194 nm were conducted, and in 2021 – 37 surveys of 605 nm. During both winters, three groups of KWs were recorded. A group of 7 KWs was encountered on 27 June 2019 near Hovgaard and Pleneau islands. It consisted of adults of both sexes and juveniles. In the same area, on 13 July 2021, another group of KWs was observed, consisting of at least 5 individuals (up to 7): 1 adult male, 2 adult females, a calf, and a juvenile of unknown sex. According to the external morphology patterns, it was determined that both groups belong to Type B, most likely of a smaller form (B1). Large gatherings of Pygoscelis penguins were observed in this area during both winters. On 22 July 2021, a group of KWs consisting of 2 adult males was observed in the Penola Strait. Observations of their joint feeding on a crabeater seal were performed. According to morphology and behaviour, they belong to the ecotype B2. As Antarctic krill move inshore during winter, penguins and crabeater seals likely took advantage of ... |
format |
Article in Journal/Newspaper |
author |
Оksana Savenko |
author_facet |
Оksana Savenko |
author_sort |
Оksana Savenko |
title |
Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica |
title_short |
Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica |
title_full |
Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica |
title_fullStr |
Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica |
title_full_unstemmed |
Winter records of killer whales (Orcinus orca) in the waters of the Wilhelm archipelago, West Antarctica |
title_sort |
winter records of killer whales (orcinus orca) in the waters of the wilhelm archipelago, west antarctica |
publisher |
National Academy of Sciences of Ukraine. National Museum of Natural History |
publishDate |
2022 |
url |
https://doi.org/10.15407/TU2417 https://doaj.org/article/bf2e047b7bc04334b4e5b0c1c51cbce6 |
long_lat |
ENVELOPE(-64.248,-64.248,-65.250,-65.250) ENVELOPE(-64.267,-64.267,-65.250,-65.250) ENVELOPE(-64.133,-64.133,-65.133,-65.133) ENVELOPE(-64.000,-64.000,-65.133,-65.133) ENVELOPE(-64.127,-64.127,-65.193,-65.193) ENVELOPE(-64.133,-64.133,-65.183,-65.183) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Austral West Antarctica Galindez Galindez Island Hovgaard Wilhelm Archipelago Penola Penola Strait |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Austral West Antarctica Galindez Galindez Island Hovgaard Wilhelm Archipelago Penola Penola Strait |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Antarctica Crabeater Seal Crabeater Seals Galindez Island Orca Orcinus orca West Antarctica Wilhelm Archipelago |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Antarctica Crabeater Seal Crabeater Seals Galindez Island Orca Orcinus orca West Antarctica Wilhelm Archipelago |
op_source |
Theriologia Ukrainica, Vol 24, Pp 210-215 (2022) |
op_relation |
http://terioshkola.org.ua/library/pts24/TU2417-savenko.htm https://doaj.org/toc/2616-7379 https://doaj.org/toc/2617-1120 doi:10.15407/TU2417 2616-7379 2617-1120 https://doaj.org/article/bf2e047b7bc04334b4e5b0c1c51cbce6 |
op_doi |
https://doi.org/10.15407/TU2417 |
container_title |
Theriologia Ukrainica |
container_volume |
2022 |
container_issue |
24 |
container_start_page |
210 |
op_container_end_page |
215 |
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1766270784942112768 |