Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s
Abstract Changes in the body condition of Antarctic minke whales ( Balaenoptera bonaerensis ) have been investigated in a number of studies, but remain contested. Here we provide a new analysis of body condition measurements, with particularly careful attention to the statistical model building and...
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ftoslouniv:oai:www.duo.uio.no:10852/89667 2023-05-15T14:02:32+02:00 Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s Cunen, Celine Walløe, Lars Konishi, Kenji Hjort, Nils Lid 2021-05-19T18:10:23Z http://hdl.handle.net/10852/89667 http://urn.nb.no/URN:NBN:no-92271 https://doi.org/10.1007/s00300-020-02783-3 EN eng http://urn.nb.no/URN:NBN:no-92271 Cunen, Celine Walløe, Lars Konishi, Kenji Hjort, Nils Lid . Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s. Polar Biology. 2021, 44, 259-273 http://hdl.handle.net/10852/89667 1910884 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Biology&rft.volume=44&rft.spage=259&rft.date=2021 Polar Biology 44 2 259 273 https://doi.org/10.1007/s00300-020-02783-3 URN:NBN:no-92271 Fulltext https://www.duo.uio.no/bitstream/handle/10852/89667/1/Cunen2021_Article_DeclineInBodyConditionInTheAnt.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 0722-4060 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2021 ftoslouniv https://doi.org/10.1007/s00300-020-02783-3 2021-12-22T23:33:36Z Abstract Changes in the body condition of Antarctic minke whales ( Balaenoptera bonaerensis ) have been investigated in a number of studies, but remain contested. Here we provide a new analysis of body condition measurements, with particularly careful attention to the statistical model building and to model selection issues. We analyse body condition data for a large number (4704) of minke whales caught between 1987 and 2005. The data consist of five different variables related to body condition (fat weight, blubber thickness and girth) and a number of temporal, spatial and biological covariates. The body condition variables are analysed using linear mixed-effects models, for which we provide sound biological motivation. Further, we conduct model selection with the focused information criterion (FIC), reflecting the fact that we have a clearly specified research question, which leads us to a clear focus parameter of particular interest. We find that there has been a substantial decline in body condition over the study period (the net declines are estimated to 10% for fat weight, 7% for blubber thickness and 3% for the girth). Interestingly, there seems to be some differences in body condition trends between males and females and in different regions of the Antarctic. The decline in body condition could indicate major changes in the Antarctic ecosystem, in particular, increased competition from some larger krill-eating whale species. Article in Journal/Newspaper Antarc* Antarctic Antarctic Minke whale Balaenoptera bonaerensis minke whale Polar Biology Southern Ocean Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Antarctic Southern Ocean The Antarctic Polar Biology 44 2 259 273 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Abstract Changes in the body condition of Antarctic minke whales ( Balaenoptera bonaerensis ) have been investigated in a number of studies, but remain contested. Here we provide a new analysis of body condition measurements, with particularly careful attention to the statistical model building and to model selection issues. We analyse body condition data for a large number (4704) of minke whales caught between 1987 and 2005. The data consist of five different variables related to body condition (fat weight, blubber thickness and girth) and a number of temporal, spatial and biological covariates. The body condition variables are analysed using linear mixed-effects models, for which we provide sound biological motivation. Further, we conduct model selection with the focused information criterion (FIC), reflecting the fact that we have a clearly specified research question, which leads us to a clear focus parameter of particular interest. We find that there has been a substantial decline in body condition over the study period (the net declines are estimated to 10% for fat weight, 7% for blubber thickness and 3% for the girth). Interestingly, there seems to be some differences in body condition trends between males and females and in different regions of the Antarctic. The decline in body condition could indicate major changes in the Antarctic ecosystem, in particular, increased competition from some larger krill-eating whale species. |
format |
Article in Journal/Newspaper |
author |
Cunen, Celine Walløe, Lars Konishi, Kenji Hjort, Nils Lid |
spellingShingle |
Cunen, Celine Walløe, Lars Konishi, Kenji Hjort, Nils Lid Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s |
author_facet |
Cunen, Celine Walløe, Lars Konishi, Kenji Hjort, Nils Lid |
author_sort |
Cunen, Celine |
title |
Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s |
title_short |
Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s |
title_full |
Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s |
title_fullStr |
Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s |
title_full_unstemmed |
Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s |
title_sort |
decline in body condition in the antarctic minke whale (balaenoptera bonaerensis) in the southern ocean during the 1990s |
publishDate |
2021 |
url |
http://hdl.handle.net/10852/89667 http://urn.nb.no/URN:NBN:no-92271 https://doi.org/10.1007/s00300-020-02783-3 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Minke whale Balaenoptera bonaerensis minke whale Polar Biology Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Minke whale Balaenoptera bonaerensis minke whale Polar Biology Southern Ocean |
op_source |
0722-4060 |
op_relation |
http://urn.nb.no/URN:NBN:no-92271 Cunen, Celine Walløe, Lars Konishi, Kenji Hjort, Nils Lid . Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s. Polar Biology. 2021, 44, 259-273 http://hdl.handle.net/10852/89667 1910884 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Biology&rft.volume=44&rft.spage=259&rft.date=2021 Polar Biology 44 2 259 273 https://doi.org/10.1007/s00300-020-02783-3 URN:NBN:no-92271 Fulltext https://www.duo.uio.no/bitstream/handle/10852/89667/1/Cunen2021_Article_DeclineInBodyConditionInTheAnt.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00300-020-02783-3 |
container_title |
Polar Biology |
container_volume |
44 |
container_issue |
2 |
container_start_page |
259 |
op_container_end_page |
273 |
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1766272840465645568 |