Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags
Otolith shape can be used to identify ecotypes of the Icelandic cod stock. The use of data storage tags (DSTs) has increased our knowledge of the stock structure of the Icelandic cod (Gadus morhua). The profiles of tagged cod reveal different migratory strategies. This has led to definition of two e...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://hdl.handle.net/1893/25001 https://doi.org/10.1139/cjfas-2016-0307 http://dspace.stir.ac.uk/bitstream/1893/25001/1/Bardarson_et_al_2017_otolith_morphology_ONLINE_DISTRIBUTION_VERSION.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/25001 2023-05-15T16:18:59+02:00 Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags Bardarson, Hlynur McAdam, Bruce James Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun University of Iceland Institute of Aquaculture Marine Research Institute (Hafrannsoknastofnunin) orcid:0000-0001-6117-2437 2017-12 application/pdf http://hdl.handle.net/1893/25001 https://doi.org/10.1139/cjfas-2016-0307 http://dspace.stir.ac.uk/bitstream/1893/25001/1/Bardarson_et_al_2017_otolith_morphology_ONLINE_DISTRIBUTION_VERSION.pdf en eng NRC Research Press Bardarson H, McAdam BJ, Thorsteinsson V, Hjorleifsson E & Marteinsdottir G (2017) Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags. Canadian Journal of Fisheries and Aquatic Sciences, 74 (12), pp. 2122-2130. https://doi.org/10.1139/cjfas-2016-0307 http://hdl.handle.net/1893/25001 doi:10.1139/cjfas-2016-0307 WOS:000415106500010 2-s2.0-85034440993 535435 http://dspace.stir.ac.uk/bitstream/1893/25001/1/Bardarson_et_al_2017_otolith_morphology_ONLINE_DISTRIBUTION_VERSION.pdf Publisher policy allows this work to be made available in this repository. Published in Canadian Journal of Fisheries and Aquatic Sciences by NRC Research Press. The original publication is available at: https://doi.org/10.1139/cjfas-2016-0307 Journal Article AM - Accepted Manuscript 2017 ftunivstirling https://doi.org/10.1139/cjfas-2016-0307 2022-06-13T18:43:58Z Otolith shape can be used to identify ecotypes of the Icelandic cod stock. The use of data storage tags (DSTs) has increased our knowledge of the stock structure of the Icelandic cod (Gadus morhua). The profiles of tagged cod reveal different migratory strategies. This has led to 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 DSTs profiles were analysed with Cluster Analysis which revealed existence of an intermediate behaviour that expresses a variable depth profile and a feeding migration which 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. The results of a discriminant function analysis indicated a difference in morphology between the ecotypes resulting in a successful classification. Article in Journal/Newspaper Gadus morhua University of Stirling: Stirling Digital Research Repository Canadian Journal of Fisheries and Aquatic Sciences 74 12 2122 2130 |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
description |
Otolith shape can be used to identify ecotypes of the Icelandic cod stock. The use of data storage tags (DSTs) has increased our knowledge of the stock structure of the Icelandic cod (Gadus morhua). The profiles of tagged cod reveal different migratory strategies. This has led to 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 DSTs profiles were analysed with Cluster Analysis which revealed existence of an intermediate behaviour that expresses a variable depth profile and a feeding migration which 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. The results of a discriminant function analysis indicated a difference in morphology between the ecotypes resulting in a successful classification. |
author2 |
University of Iceland Institute of Aquaculture Marine Research Institute (Hafrannsoknastofnunin) orcid:0000-0001-6117-2437 |
format |
Article in Journal/Newspaper |
author |
Bardarson, Hlynur McAdam, Bruce James Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun |
spellingShingle |
Bardarson, Hlynur McAdam, Bruce James Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags |
author_facet |
Bardarson, Hlynur McAdam, Bruce James Thorsteinsson, Vilhjalmur Hjorleifsson, Einar Marteinsdottir, Gudrun |
author_sort |
Bardarson, Hlynur |
title |
Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags |
title_short |
Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags |
title_full |
Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags |
title_fullStr |
Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags |
title_full_unstemmed |
Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags |
title_sort |
otolith shape differences between ecotypes of icelandic cod (gadus morhua) with known migratory behavior inferred from data storage tags |
publisher |
NRC Research Press |
publishDate |
2017 |
url |
http://hdl.handle.net/1893/25001 https://doi.org/10.1139/cjfas-2016-0307 http://dspace.stir.ac.uk/bitstream/1893/25001/1/Bardarson_et_al_2017_otolith_morphology_ONLINE_DISTRIBUTION_VERSION.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
Bardarson H, McAdam BJ, Thorsteinsson V, Hjorleifsson E & Marteinsdottir G (2017) Otolith shape differences between ecotypes of Icelandic cod (Gadus morhua) with known migratory behavior inferred from Data Storage Tags. Canadian Journal of Fisheries and Aquatic Sciences, 74 (12), pp. 2122-2130. https://doi.org/10.1139/cjfas-2016-0307 http://hdl.handle.net/1893/25001 doi:10.1139/cjfas-2016-0307 WOS:000415106500010 2-s2.0-85034440993 535435 http://dspace.stir.ac.uk/bitstream/1893/25001/1/Bardarson_et_al_2017_otolith_morphology_ONLINE_DISTRIBUTION_VERSION.pdf |
op_rights |
Publisher policy allows this work to be made available in this repository. Published in Canadian Journal of Fisheries and Aquatic Sciences by NRC Research Press. The original publication is available at: https://doi.org/10.1139/cjfas-2016-0307 |
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_ |
1766005281583529984 |