Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern
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 environment...
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American Fisheries Society
2011
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ftbioone: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 Mari S. Myksvoll Svein Sundby Bjørn Ådlandsvik Frode B. Vikebø Mari S. Myksvoll Svein Sundby Bjørn Ådlandsvik Frode B. Vikebø world 2011-01-01 text/HTML https://doi.org/10.1080/19425120.2011.595258 en eng American Fisheries Society doi:10.1080/19425120.2011.595258 All rights reserved. https://doi.org/10.1080/19425120.2011.595258 Text 2011 ftbioone https://doi.org/10.1080/19425120.2011.595258 2024-05-07T00:51:43Z 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. Text atlantic cod Gadus morhua Northern Norway BioOne Online Journals Norway Marine and Coastal Fisheries 3 1 279 294 |
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BioOne Online Journals |
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ftbioone |
language |
English |
description |
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. |
author2 |
Mari S. Myksvoll Svein Sundby Bjørn Ådlandsvik Frode B. Vikebø |
format |
Text |
author |
Mari S. Myksvoll Svein Sundby Bjørn Ådlandsvik Frode B. Vikebø |
spellingShingle |
Mari S. Myksvoll Svein Sundby Bjørn Ådlandsvik Frode B. Vikebø Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern |
author_facet |
Mari S. Myksvoll Svein Sundby Bjørn Ådlandsvik Frode B. Vikebø |
author_sort |
Mari S. Myksvoll |
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 |
American Fisheries Society |
publishDate |
2011 |
url |
https://doi.org/10.1080/19425120.2011.595258 |
op_coverage |
world |
geographic |
Norway |
geographic_facet |
Norway |
genre |
atlantic cod Gadus morhua Northern Norway |
genre_facet |
atlantic cod Gadus morhua Northern Norway |
op_source |
https://doi.org/10.1080/19425120.2011.595258 |
op_relation |
doi:10.1080/19425120.2011.595258 |
op_rights |
All rights reserved. |
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_ |
1800747676620292096 |