Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean
Aim: Animal tracking can provide unique insights into the ecology and conservation of marine species, such as the partitioning of habitat, including differences between life history stages or sexes, and can inform fisheries stock assessments, bycatch reduction and spatial management such as dynamic...
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Language: | English |
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Online Access: | https://doi.org/10.1111/ddi.12941 |
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ftunivscoast:usc:28781 2023-05-15T17:36:44+02:00 Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean Maxwell, Sara M Scales, Kylie L Bograd, Steven J Briscoe, Dana K Dewar, Heidi Hazen, Elliott L Lewison, Rebecca L Welch, Heather Crowder, Larry B 2019 https://doi.org/10.1111/ddi.12941 eng eng Wiley-Blackwell Publishing Ltd. usc:28781 URN:ISSN: 1366-9516 Copyright © 2019 The Authors. Diversity and Distributions Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited CC-BY FoR 05 (Environmental Sciences) FoR 06 (Biological Sciences) dynamic oceanographic variables fisheries management habitat partitioning home range spatial segregation species distribution modelling Journal Article 2019 ftunivscoast https://doi.org/10.1111/ddi.12941 2019-08-05T22:25:45Z Aim: Animal tracking can provide unique insights into the ecology and conservation of marine species, such as the partitioning of habitat, including differences between life history stages or sexes, and can inform fisheries stock assessments, bycatch reduction and spatial management such as dynamic management. Location: Northeast Pacific Ocean. Methods: We used satellite tracking data from 47 blue sharks (Prionace glauca) from the Northeast Pacific to determine movements and home range along the west coast of North America, and sex–size class (immature females, mature males) specific habitat preferences using boosted regression trees. Using a suite of static and dynamic environmental variables, we determined distribution and habitat preferences across summer and fall for each sex–size class. Results: We found that there was spatial segregation between sex–size classes particularly in the summer months with immature females found largely north of 33°N, and males south of 35°N. In fall, females travelled south, resulting in an overlap in distributions south of 37°N. Sea surface temperature (SST), latitude and longitude were top predictors. However, immature females and adult males demonstrated unique habitat preferences including SST, with immature females preferring cooler temperatures (SST < 15°C) than adult males in summer, and a broader band of SST than adult males in fall. All models performed well, explaining 50%–67% of deviance, and 23%–41% of deviance when predictions were cross‐validated. Main conclusions: We provide first insights into coastal movements and habitat preferences of blue sharks in the Northeast Pacific. We found that immature females undergo a seasonal southward migration in this more coastal habitat, similar to patterns observed in the North Atlantic. We also found some overlap between adult males and immature females in fall months, suggesting the importance of more coastal habitat in managing this species, particularly in determining population structure for blue shark stock assessments, and reducing blue shark bycatch. Article in Journal/Newspaper North Atlantic University of the Sunshine Coast, Queensland, Australia: COAST Research Database Pacific Diversity and Distributions |
institution |
Open Polar |
collection |
University of the Sunshine Coast, Queensland, Australia: COAST Research Database |
op_collection_id |
ftunivscoast |
language |
English |
topic |
FoR 05 (Environmental Sciences) FoR 06 (Biological Sciences) dynamic oceanographic variables fisheries management habitat partitioning home range spatial segregation species distribution modelling |
spellingShingle |
FoR 05 (Environmental Sciences) FoR 06 (Biological Sciences) dynamic oceanographic variables fisheries management habitat partitioning home range spatial segregation species distribution modelling Maxwell, Sara M Scales, Kylie L Bograd, Steven J Briscoe, Dana K Dewar, Heidi Hazen, Elliott L Lewison, Rebecca L Welch, Heather Crowder, Larry B Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean |
topic_facet |
FoR 05 (Environmental Sciences) FoR 06 (Biological Sciences) dynamic oceanographic variables fisheries management habitat partitioning home range spatial segregation species distribution modelling |
description |
Aim: Animal tracking can provide unique insights into the ecology and conservation of marine species, such as the partitioning of habitat, including differences between life history stages or sexes, and can inform fisheries stock assessments, bycatch reduction and spatial management such as dynamic management. Location: Northeast Pacific Ocean. Methods: We used satellite tracking data from 47 blue sharks (Prionace glauca) from the Northeast Pacific to determine movements and home range along the west coast of North America, and sex–size class (immature females, mature males) specific habitat preferences using boosted regression trees. Using a suite of static and dynamic environmental variables, we determined distribution and habitat preferences across summer and fall for each sex–size class. Results: We found that there was spatial segregation between sex–size classes particularly in the summer months with immature females found largely north of 33°N, and males south of 35°N. In fall, females travelled south, resulting in an overlap in distributions south of 37°N. Sea surface temperature (SST), latitude and longitude were top predictors. However, immature females and adult males demonstrated unique habitat preferences including SST, with immature females preferring cooler temperatures (SST < 15°C) than adult males in summer, and a broader band of SST than adult males in fall. All models performed well, explaining 50%–67% of deviance, and 23%–41% of deviance when predictions were cross‐validated. Main conclusions: We provide first insights into coastal movements and habitat preferences of blue sharks in the Northeast Pacific. We found that immature females undergo a seasonal southward migration in this more coastal habitat, similar to patterns observed in the North Atlantic. We also found some overlap between adult males and immature females in fall months, suggesting the importance of more coastal habitat in managing this species, particularly in determining population structure for blue shark stock assessments, and reducing blue shark bycatch. |
format |
Article in Journal/Newspaper |
author |
Maxwell, Sara M Scales, Kylie L Bograd, Steven J Briscoe, Dana K Dewar, Heidi Hazen, Elliott L Lewison, Rebecca L Welch, Heather Crowder, Larry B |
author_facet |
Maxwell, Sara M Scales, Kylie L Bograd, Steven J Briscoe, Dana K Dewar, Heidi Hazen, Elliott L Lewison, Rebecca L Welch, Heather Crowder, Larry B |
author_sort |
Maxwell, Sara M |
title |
Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean |
title_short |
Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean |
title_full |
Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean |
title_fullStr |
Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean |
title_full_unstemmed |
Seasonal spatial segregation in blue sharks (Prionace glauca) by sex and size class in the Northeast Pacific Ocean |
title_sort |
seasonal spatial segregation in blue sharks (prionace glauca) by sex and size class in the northeast pacific ocean |
publisher |
Wiley-Blackwell Publishing Ltd. |
publishDate |
2019 |
url |
https://doi.org/10.1111/ddi.12941 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
usc:28781 URN:ISSN: 1366-9516 |
op_rights |
Copyright © 2019 The Authors. Diversity and Distributions Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1111/ddi.12941 |
container_title |
Diversity and Distributions |
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1766136328836087808 |