Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea
The population of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea is in a unique position on the continental shelf edge, with vast shelf waters to the south, and deep Southern Ocean to the north. We describe sex-related differences in the winter distribution of this population,...
Published in: | Marine Mammal Science |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | https://research-portal.st-andrews.ac.uk/en/publications/3180ed44-822f-41a1-ad34-3f3a446973e3 https://doi.org/10.1111/mms.12461 https://research-repository.st-andrews.ac.uk/bitstream/10023/12266/1/Langley_et_al_2017_Marine_Mammal_Science_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/3180ed44-822f-41a1-ad34-3f3a446973e3 2024-09-30T14:44:07+00:00 Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea Langley, Izzy Fedak, Mike Nicholls, Keith Boehme, Lars 2018-04 application/pdf https://research-portal.st-andrews.ac.uk/en/publications/3180ed44-822f-41a1-ad34-3f3a446973e3 https://doi.org/10.1111/mms.12461 https://research-repository.st-andrews.ac.uk/bitstream/10023/12266/1/Langley_et_al_2017_Marine_Mammal_Science_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/publications/3180ed44-822f-41a1-ad34-3f3a446973e3 info:eu-repo/semantics/openAccess Langley , I , Fedak , M , Nicholls , K & Boehme , L 2018 , ' Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea ' , Marine Mammal Science , vol. 34 , no. 2 , pp. 403-419 . https://doi.org/10.1111/mms.12461 Weddell seal Leptonychotes weddellii Postmolt distribution Sex-related differences CTD-SRDL State-space model Resident state Weddell Sea article 2018 ftunstandrewcris https://doi.org/10.1111/mms.12461 2024-09-04T23:45:35Z The population of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea is in a unique position on the continental shelf edge, with vast shelf waters to the south, and deep Southern Ocean to the north. We describe sex-related differences in the winter distribution of this population, from data collected by 20 conductivity-temperature-depth satellite relay data loggers deployed in February 2011 at the end of the annual molt. The regional daily speed was calculated, and a state-space model was used to estimate behavioral states to positions along individuals’ tracks. GLMMs estimated that males and smaller individuals, diving in shallower water, traveled less far per day of deployment (males 14.6 ± 2.26 km/d, females 18.9 ± 2.42 km/d), and males were estimated to dive in shallower water (males 604 ± 382 m, females 1,875 ± 1,458 m). Males and smaller individuals were also estimated to be more resident; males spent an average 83.4% ± 7.7% of their time in a resident behavioral state, compared to females at 74.1% ± 7.1%. This evidence that male and female Weddell seals in the southern Weddell Sea are adopting different strategies has not been shown elsewhere along their circumpolar distribution. Article in Journal/Newspaper Southern Ocean Weddell Sea Weddell Seal Weddell Seals University of St Andrews: Research Portal Southern Ocean Weddell Weddell Sea Marine Mammal Science 34 2 403 419 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Weddell seal Leptonychotes weddellii Postmolt distribution Sex-related differences CTD-SRDL State-space model Resident state Weddell Sea |
spellingShingle |
Weddell seal Leptonychotes weddellii Postmolt distribution Sex-related differences CTD-SRDL State-space model Resident state Weddell Sea Langley, Izzy Fedak, Mike Nicholls, Keith Boehme, Lars Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea |
topic_facet |
Weddell seal Leptonychotes weddellii Postmolt distribution Sex-related differences CTD-SRDL State-space model Resident state Weddell Sea |
description |
The population of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea is in a unique position on the continental shelf edge, with vast shelf waters to the south, and deep Southern Ocean to the north. We describe sex-related differences in the winter distribution of this population, from data collected by 20 conductivity-temperature-depth satellite relay data loggers deployed in February 2011 at the end of the annual molt. The regional daily speed was calculated, and a state-space model was used to estimate behavioral states to positions along individuals’ tracks. GLMMs estimated that males and smaller individuals, diving in shallower water, traveled less far per day of deployment (males 14.6 ± 2.26 km/d, females 18.9 ± 2.42 km/d), and males were estimated to dive in shallower water (males 604 ± 382 m, females 1,875 ± 1,458 m). Males and smaller individuals were also estimated to be more resident; males spent an average 83.4% ± 7.7% of their time in a resident behavioral state, compared to females at 74.1% ± 7.1%. This evidence that male and female Weddell seals in the southern Weddell Sea are adopting different strategies has not been shown elsewhere along their circumpolar distribution. |
format |
Article in Journal/Newspaper |
author |
Langley, Izzy Fedak, Mike Nicholls, Keith Boehme, Lars |
author_facet |
Langley, Izzy Fedak, Mike Nicholls, Keith Boehme, Lars |
author_sort |
Langley, Izzy |
title |
Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea |
title_short |
Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea |
title_full |
Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea |
title_fullStr |
Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea |
title_full_unstemmed |
Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea |
title_sort |
sex-related differences in the postmolt distribution of weddell seals ( leptonychotes weddellii ) in the southern weddell sea |
publishDate |
2018 |
url |
https://research-portal.st-andrews.ac.uk/en/publications/3180ed44-822f-41a1-ad34-3f3a446973e3 https://doi.org/10.1111/mms.12461 https://research-repository.st-andrews.ac.uk/bitstream/10023/12266/1/Langley_et_al_2017_Marine_Mammal_Science_CC.pdf |
geographic |
Southern Ocean Weddell Weddell Sea |
geographic_facet |
Southern Ocean Weddell Weddell Sea |
genre |
Southern Ocean Weddell Sea Weddell Seal Weddell Seals |
genre_facet |
Southern Ocean Weddell Sea Weddell Seal Weddell Seals |
op_source |
Langley , I , Fedak , M , Nicholls , K & Boehme , L 2018 , ' Sex-related differences in the postmolt distribution of Weddell seals ( Leptonychotes weddellii ) in the southern Weddell Sea ' , Marine Mammal Science , vol. 34 , no. 2 , pp. 403-419 . https://doi.org/10.1111/mms.12461 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/publications/3180ed44-822f-41a1-ad34-3f3a446973e3 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/mms.12461 |
container_title |
Marine Mammal Science |
container_volume |
34 |
container_issue |
2 |
container_start_page |
403 |
op_container_end_page |
419 |
_version_ |
1811645597161095168 |