Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags
Otolith shape can be used to identify ecotypes of the Icelandic cod (Gadus morhua) stock. The use of data storage tags has increased our knowledge of the stock structure of Icelandic cod. The profiles of tagged cod reveal different migratory strategies. This has led to the definition of two ecotypes...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2017
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Online Access: | http://dx.doi.org/10.1139/cjfas-2016-0307 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2016-0307 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2016-0307 |
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crcansciencepubl:10.1139/cjfas-2016-0307 2023-12-17T10:30:22+01:00 Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags Bardarson, Hlynur McAdam, Bruce. J. Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun 2017 http://dx.doi.org/10.1139/cjfas-2016-0307 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2016-0307 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2016-0307 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 74, issue 12, page 2122-2130 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2017 crcansciencepubl https://doi.org/10.1139/cjfas-2016-0307 2023-11-19T13:39:06Z Otolith shape can be used to identify ecotypes of the Icelandic cod (Gadus morhua) stock. The use of data storage tags has increased our knowledge of the stock structure of Icelandic cod. The profiles of tagged cod reveal different migratory strategies. This has led to the definition of two ecotypes within the cod stock. Frontal ecotypes reside in deep waters during feeding season and express a highly variable temperature profile associated with thermal fronts, while coastal ecotypes stay in shallow waters all year round. In this study, the data storage tag profiles were analysed with cluster analysis, which revealed the existence of an intermediate behaviour that expresses a variable depth profile and feeding migration that is both shorter in time and not as deep. The main objective was to develop a morphological key based on otoliths to distinguish the ecotypes. The shape of the otoliths was extracted with shape measurements and fast Fourier transforms. A discriminant function analysis indicated a difference in morphology between the ecotypes, resulting in successful classification. Article in Journal/Newspaper Gadus morhua Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 74 12 2122 2130 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
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Aquatic Science Ecology, Evolution, Behavior and Systematics Bardarson, Hlynur McAdam, Bruce. J. Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Otolith shape can be used to identify ecotypes of the Icelandic cod (Gadus morhua) stock. The use of data storage tags has increased our knowledge of the stock structure of Icelandic cod. The profiles of tagged cod reveal different migratory strategies. This has led to the definition of two ecotypes within the cod stock. Frontal ecotypes reside in deep waters during feeding season and express a highly variable temperature profile associated with thermal fronts, while coastal ecotypes stay in shallow waters all year round. In this study, the data storage tag profiles were analysed with cluster analysis, which revealed the existence of an intermediate behaviour that expresses a variable depth profile and feeding migration that is both shorter in time and not as deep. The main objective was to develop a morphological key based on otoliths to distinguish the ecotypes. The shape of the otoliths was extracted with shape measurements and fast Fourier transforms. A discriminant function analysis indicated a difference in morphology between the ecotypes, resulting in successful classification. |
format |
Article in Journal/Newspaper |
author |
Bardarson, Hlynur McAdam, Bruce. J. Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun |
author_facet |
Bardarson, Hlynur McAdam, Bruce. J. Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun |
author_sort |
Bardarson, Hlynur |
title |
Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags |
title_short |
Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags |
title_full |
Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags |
title_fullStr |
Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags |
title_full_unstemmed |
Otolith shape differences between ecotypes of Icelandic cod ( Gadus morhua ) with known migratory behaviour inferred from data storage tags |
title_sort |
otolith shape differences between ecotypes of icelandic cod ( gadus morhua ) with known migratory behaviour inferred from data storage tags |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
http://dx.doi.org/10.1139/cjfas-2016-0307 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2016-0307 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2016-0307 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 74, issue 12, page 2122-2130 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2016-0307 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
74 |
container_issue |
12 |
container_start_page |
2122 |
op_container_end_page |
2130 |
_version_ |
1785583316484751360 |