Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern
Abstract Norwegian coastal cod form a stationary population of Atlantic cod Gadus morhua consisting of several genetically separated subpopulations. A small‐scale differentiation in marine populations with pelagic eggs and larvae is made possible by local retention of early life stages in coastal en...
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Online Access: | http://dx.doi.org/10.1080/19425120.2011.595258 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/19425120.2011.595258 |
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crwiley:10.1080/19425120.2011.595258 2024-06-02T08:03:12+00:00 Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern Myksvoll, Mari S. Sundby, Svein Ådlandsvik, Bjørn Vikebø, Frode B. 2011 http://dx.doi.org/10.1080/19425120.2011.595258 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/19425120.2011.595258 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine and Coastal Fisheries volume 3, issue 1, page 279-294 ISSN 1942-5120 1942-5120 journal-article 2011 crwiley https://doi.org/10.1080/19425120.2011.595258 2024-05-03T10:45:40Z Abstract Norwegian coastal cod form a stationary population of Atlantic cod Gadus morhua consisting of several genetically separated subpopulations. A small‐scale differentiation in marine populations with pelagic eggs and larvae is made possible by local retention of early life stages in coastal environments. A numerical model was used to simulate the circulation in a fjord system in northern Norway over 2 years with different river runoff patterns. The dispersal of cod eggs was calculated with a particle‐tracking model that used three‐dimensional currents. The observed thickness of the low‐salinity surface layer was well reproduced by the model, but the surface salinity was generally lower in the model than in the observations. The cod eggs attained a subsurface vertical distribution, avoiding the surface and causing retention. Interannual variations in river runoff can cause small changes in the vertical distribution of cod eggs and larger changes in the vertical current structure. Retention in the fjord system was strong in both years, but some eggs were subjected to offshore transport over a limited time period. The timing of offshore transport depended on the precipitation and temperatures in adjacent drainage areas. A possible match between maximized spawning and offshore transport may have a negative effect on local recruitment. Article in Journal/Newspaper atlantic cod Gadus morhua Northern Norway Wiley Online Library Norway Marine and Coastal Fisheries 3 1 279 294 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Norwegian coastal cod form a stationary population of Atlantic cod Gadus morhua consisting of several genetically separated subpopulations. A small‐scale differentiation in marine populations with pelagic eggs and larvae is made possible by local retention of early life stages in coastal environments. A numerical model was used to simulate the circulation in a fjord system in northern Norway over 2 years with different river runoff patterns. The dispersal of cod eggs was calculated with a particle‐tracking model that used three‐dimensional currents. The observed thickness of the low‐salinity surface layer was well reproduced by the model, but the surface salinity was generally lower in the model than in the observations. The cod eggs attained a subsurface vertical distribution, avoiding the surface and causing retention. Interannual variations in river runoff can cause small changes in the vertical distribution of cod eggs and larger changes in the vertical current structure. Retention in the fjord system was strong in both years, but some eggs were subjected to offshore transport over a limited time period. The timing of offshore transport depended on the precipitation and temperatures in adjacent drainage areas. A possible match between maximized spawning and offshore transport may have a negative effect on local recruitment. |
format |
Article in Journal/Newspaper |
author |
Myksvoll, Mari S. Sundby, Svein Ådlandsvik, Bjørn Vikebø, Frode B. |
spellingShingle |
Myksvoll, Mari S. Sundby, Svein Ådlandsvik, Bjørn Vikebø, Frode B. Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
author_facet |
Myksvoll, Mari S. Sundby, Svein Ådlandsvik, Bjørn Vikebø, Frode B. |
author_sort |
Myksvoll, Mari S. |
title |
Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
title_short |
Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
title_full |
Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
title_fullStr |
Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
title_full_unstemmed |
Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
title_sort |
retention of coastal cod eggs in a fjord caused by interactions between egg buoyancy and circulation pattern |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1080/19425120.2011.595258 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/19425120.2011.595258 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
atlantic cod Gadus morhua Northern Norway |
genre_facet |
atlantic cod Gadus morhua Northern Norway |
op_source |
Marine and Coastal Fisheries volume 3, issue 1, page 279-294 ISSN 1942-5120 1942-5120 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1080/19425120.2011.595258 |
container_title |
Marine and Coastal Fisheries |
container_volume |
3 |
container_issue |
1 |
container_start_page |
279 |
op_container_end_page |
294 |
_version_ |
1800747680977125376 |