CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN
Abstract We conducted 239.5 h and 3,494 km of cetacean surveys in the Amundsen and Bellingshausen seas, from 15 February to 31 March 1994; most of the area, the large portion of which was ice covered, had never before nor has it since been surveyed for cetaceans, even to the date when this paper was...
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Online Access: | http://dx.doi.org/10.1111/j.1748-7692.2007.00109.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2007.00109.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2007.00109.x |
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crwiley:10.1111/j.1748-7692.2007.00109.x 2023-12-03T10:14:07+01:00 CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN Ainley, David G. Dugger, Katie M. Toniolo, Viola Gaffney, Ian 2007 http://dx.doi.org/10.1111/j.1748-7692.2007.00109.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2007.00109.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2007.00109.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 23, issue 2, page 287-305 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2007 crwiley https://doi.org/10.1111/j.1748-7692.2007.00109.x 2023-11-09T13:33:47Z Abstract We conducted 239.5 h and 3,494 km of cetacean surveys in the Amundsen and Bellingshausen seas, from 15 February to 31 March 1994; most of the area, the large portion of which was ice covered, had never before nor has it since been surveyed for cetaceans, even to the date when this paper was prepared (2006). Logistic regression and an information‐theoretic approach related the occurrence of Antarctic minke whales Balaenoptera bonaerensis (the most abundant species) to whether we were in open‐ or pack‐ice‐covered pelagic or neritic waters, in or out of the marginal ice zone (MIZ), and north or south of the Antarctic Circumpolar Current southern boundary. Other variables included date and distance to the MIZ and shelfbreak front. Statistical analysis showed that the probability of sighting a minke, as well as killer whale—but not the case for an index to whale density—was related to the proximity of coastal polynyas in early autumn, switching offshore to the MIZ once waters within the pack began to freeze persistently later in the season. Probability of detection was higher with distance into the MIZ. Supporting these findings, the density index was strongly related to ice concentration in an inverse relationship. The strong relationship to polynyas and the MIZ indicate that sea‐ice divergence altered by decadal or longer‐term climate change, as described in the recent literature, could well affect any apparent, long‐term trends evident in this species' abundance if surveyed only in open or near‐to‐ice waters. We speculate on how the minke whale's pagophilic nature (1) could have been encouraged by large‐scale industrial whaling and by competition with species more characteristic of open waters and the outer MIZ, and (2) may have protected the population somewhat during industrial whaling resulting in the much greater abundance of this species now compared to other targeted species. Article in Journal/Newspaper Antarc* Antarctic Balaenoptera bonaerensis Bellingshausen Sea Killer Whale Sea ice Southern Ocean Killer whale Wiley Online Library (via Crossref) Antarctic Southern Ocean The Antarctic Bellingshausen Sea Marine Mammal Science 23 2 287 305 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Ainley, David G. Dugger, Katie M. Toniolo, Viola Gaffney, Ian CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract We conducted 239.5 h and 3,494 km of cetacean surveys in the Amundsen and Bellingshausen seas, from 15 February to 31 March 1994; most of the area, the large portion of which was ice covered, had never before nor has it since been surveyed for cetaceans, even to the date when this paper was prepared (2006). Logistic regression and an information‐theoretic approach related the occurrence of Antarctic minke whales Balaenoptera bonaerensis (the most abundant species) to whether we were in open‐ or pack‐ice‐covered pelagic or neritic waters, in or out of the marginal ice zone (MIZ), and north or south of the Antarctic Circumpolar Current southern boundary. Other variables included date and distance to the MIZ and shelfbreak front. Statistical analysis showed that the probability of sighting a minke, as well as killer whale—but not the case for an index to whale density—was related to the proximity of coastal polynyas in early autumn, switching offshore to the MIZ once waters within the pack began to freeze persistently later in the season. Probability of detection was higher with distance into the MIZ. Supporting these findings, the density index was strongly related to ice concentration in an inverse relationship. The strong relationship to polynyas and the MIZ indicate that sea‐ice divergence altered by decadal or longer‐term climate change, as described in the recent literature, could well affect any apparent, long‐term trends evident in this species' abundance if surveyed only in open or near‐to‐ice waters. We speculate on how the minke whale's pagophilic nature (1) could have been encouraged by large‐scale industrial whaling and by competition with species more characteristic of open waters and the outer MIZ, and (2) may have protected the population somewhat during industrial whaling resulting in the much greater abundance of this species now compared to other targeted species. |
format |
Article in Journal/Newspaper |
author |
Ainley, David G. Dugger, Katie M. Toniolo, Viola Gaffney, Ian |
author_facet |
Ainley, David G. Dugger, Katie M. Toniolo, Viola Gaffney, Ian |
author_sort |
Ainley, David G. |
title |
CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN |
title_short |
CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN |
title_full |
CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN |
title_fullStr |
CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN |
title_full_unstemmed |
CETACEAN OCCURRENCE PATTERNS IN THE AMUNDSEN AND SOUTHERN BELLINGSHAUSEN SEA SECTOR, SOUTHERN OCEAN |
title_sort |
cetacean occurrence patterns in the amundsen and southern bellingshausen sea sector, southern ocean |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2007.00109.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2007.00109.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2007.00109.x |
geographic |
Antarctic Southern Ocean The Antarctic Bellingshausen Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Bellingshausen Sea |
genre |
Antarc* Antarctic Balaenoptera bonaerensis Bellingshausen Sea Killer Whale Sea ice Southern Ocean Killer whale |
genre_facet |
Antarc* Antarctic Balaenoptera bonaerensis Bellingshausen Sea Killer Whale Sea ice Southern Ocean Killer whale |
op_source |
Marine Mammal Science volume 23, issue 2, page 287-305 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2007.00109.x |
container_title |
Marine Mammal Science |
container_volume |
23 |
container_issue |
2 |
container_start_page |
287 |
op_container_end_page |
305 |
_version_ |
1784261209658228736 |