Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data
Abstract Pygmy blue whales ( Balaenoptera musculus brevicauda ) are ≤24.1 m and are generally found north of 52°S in summer, whereas the more southerly Antarctic blue whales ( B. m. intermedia ) may exceed 30 m. Previous assessments have assumed that catches and recent surveys south of 60°S recorded...
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crwiley:10.1111/j.1748-7692.2009.00292.x 2024-04-07T07:47:54+00:00 Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data Branch, T. A. Mikhalev, Y. A. Kato, H. 2009 http://dx.doi.org/10.1111/j.1748-7692.2009.00292.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2009.00292.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2009.00292.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 25, issue 4, page 833-854 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2009 crwiley https://doi.org/10.1111/j.1748-7692.2009.00292.x 2024-03-14T00:42:23Z Abstract Pygmy blue whales ( Balaenoptera musculus brevicauda ) are ≤24.1 m and are generally found north of 52°S in summer, whereas the more southerly Antarctic blue whales ( B. m. intermedia ) may exceed 30 m. Previous assessments have assumed that catches and recent surveys south of 60°S recorded Antarctic blue whales, but these may have included pygmy blue whales. Here, we use ovarian corpora, which accumulate with ovulations and hence with length, to separate these subspecies. The resulting Bayesian mixture model, applied to 1,380 Northern Region (north of 52°S and 35°–180°E) and 3,844 Southern Ocean (south of 52°S) blue whales, estimated that only 0.1% (95% credibility intervals 0.0%–0.4%) of the Antarctic region blue whales were pygmy blue whales and, unexpectedly, found significantly lower lifetime ovulation counts for pygmy blue whales than for Antarctic blue whales (7.6 vs . 13.6). Over four decades, despite substantial depletion of Antarctic blue whales, there was no trend in the estimated proportion of pygmy blue whales in the Antarctic. Several lines of investigation found no evidence for sizeable numbers of pygmy blue whales in ovarian corpora data collected in the 1930s, as was previously hypothesized. Article in Journal/Newspaper Antarc* Antarctic Balaenoptera musculus Southern Ocean Wiley Online Library Antarctic Southern Ocean The Antarctic Marine Mammal Science 25 4 833 854 |
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collection |
Wiley Online Library |
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crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Branch, T. A. Mikhalev, Y. A. Kato, H. Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Pygmy blue whales ( Balaenoptera musculus brevicauda ) are ≤24.1 m and are generally found north of 52°S in summer, whereas the more southerly Antarctic blue whales ( B. m. intermedia ) may exceed 30 m. Previous assessments have assumed that catches and recent surveys south of 60°S recorded Antarctic blue whales, but these may have included pygmy blue whales. Here, we use ovarian corpora, which accumulate with ovulations and hence with length, to separate these subspecies. The resulting Bayesian mixture model, applied to 1,380 Northern Region (north of 52°S and 35°–180°E) and 3,844 Southern Ocean (south of 52°S) blue whales, estimated that only 0.1% (95% credibility intervals 0.0%–0.4%) of the Antarctic region blue whales were pygmy blue whales and, unexpectedly, found significantly lower lifetime ovulation counts for pygmy blue whales than for Antarctic blue whales (7.6 vs . 13.6). Over four decades, despite substantial depletion of Antarctic blue whales, there was no trend in the estimated proportion of pygmy blue whales in the Antarctic. Several lines of investigation found no evidence for sizeable numbers of pygmy blue whales in ovarian corpora data collected in the 1930s, as was previously hypothesized. |
format |
Article in Journal/Newspaper |
author |
Branch, T. A. Mikhalev, Y. A. Kato, H. |
author_facet |
Branch, T. A. Mikhalev, Y. A. Kato, H. |
author_sort |
Branch, T. A. |
title |
Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data |
title_short |
Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data |
title_full |
Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data |
title_fullStr |
Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data |
title_full_unstemmed |
Separating pygmy and Antarctic blue whales using long‐forgotten ovarian data |
title_sort |
separating pygmy and antarctic blue whales using long‐forgotten ovarian data |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2009.00292.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2009.00292.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2009.00292.x |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Balaenoptera musculus Southern Ocean |
genre_facet |
Antarc* Antarctic Balaenoptera musculus Southern Ocean |
op_source |
Marine Mammal Science volume 25, issue 4, page 833-854 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2009.00292.x |
container_title |
Marine Mammal Science |
container_volume |
25 |
container_issue |
4 |
container_start_page |
833 |
op_container_end_page |
854 |
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1795675101251764224 |