Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland
The population genetics, such as population structure, of Atlantic cod have been unravelled in the last two decades, at an ever finer scale. Yet, much is still unknown about the evolutionary genetics of cod and the possible impact of fisheries on the genetic structure, both temporal and spatial. The...
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Online Access: | http://hdl.handle.net/1946/13858 |
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ftskemman:oai:skemman.is:1946/13858 2023-05-15T15:27:29+02:00 Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland The historical genetic variation in Atlantic cod (Gadus morhua L.) in Icelandic waters Klara Björg Jakobsdóttir 1968- Háskóli Íslands 2013-01 application/pdf http://hdl.handle.net/1946/13858 en eng http://hdl.handle.net/1946/13858 Doktorsritgerðir Líffræði Þorskur Thesis Doctoral 2013 ftskemman 2022-12-11T06:56:40Z The population genetics, such as population structure, of Atlantic cod have been unravelled in the last two decades, at an ever finer scale. Yet, much is still unknown about the evolutionary genetics of cod and the possible impact of fisheries on the genetic structure, both temporal and spatial. The objectives of this thesis were to investigate the extent of temporal genetic differentiation in Icelandic cod over the latter half of last century and to correlate historical changes of genetic variation with known factors such as the potential impact of fisheries. A prerequisite for such a study is access to historical genetic material and development of the appropriate genetic markers. DNA was obtained from dried tissue on stored cod otoliths, previously used for age determination. These were retrieved from the archives of the Icelandic Marine Research Institute. In the first part of the thesis, specific set of microsatellites markers were developed, suitable for the degraded cod DNA, usually obtained from dried tissue remains. Secondly the connection between important behavioral phenotypes and genotypes at non-neutral marker Pan I was determined, using current-day genetic material. This analysis showed that the Pan IAA homozygotes could be assigned to a “coastal” type that appeared to follow seasonal trend in temperature, foraging in relatively shallow waters. On the other hand, most Pan IBB homozygotes were assigned to “frontal” type that is characterized by migrating to colder and deeper waters during feeding migration. For the main part of the thesis historical data set of archived otoliths collected between 1948 and 2002 was used to jointly examine phenotypic and genetic data with the goal to examine historical trends in the genetic composition of the Icelandic cod stock. This analysis showed that there have been major changes in the genetic variation at the Pan I locus of Icelandic cod during the latter part of last century. These have occurred alongside changes in fishing patterns and pressure, and age ... Doctoral or Postdoctoral Thesis atlantic cod Gadus morhua Skemman (Iceland) |
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Open Polar |
collection |
Skemman (Iceland) |
op_collection_id |
ftskemman |
language |
English |
topic |
Doktorsritgerðir Líffræði Þorskur |
spellingShingle |
Doktorsritgerðir Líffræði Þorskur Klara Björg Jakobsdóttir 1968- Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland |
topic_facet |
Doktorsritgerðir Líffræði Þorskur |
description |
The population genetics, such as population structure, of Atlantic cod have been unravelled in the last two decades, at an ever finer scale. Yet, much is still unknown about the evolutionary genetics of cod and the possible impact of fisheries on the genetic structure, both temporal and spatial. The objectives of this thesis were to investigate the extent of temporal genetic differentiation in Icelandic cod over the latter half of last century and to correlate historical changes of genetic variation with known factors such as the potential impact of fisheries. A prerequisite for such a study is access to historical genetic material and development of the appropriate genetic markers. DNA was obtained from dried tissue on stored cod otoliths, previously used for age determination. These were retrieved from the archives of the Icelandic Marine Research Institute. In the first part of the thesis, specific set of microsatellites markers were developed, suitable for the degraded cod DNA, usually obtained from dried tissue remains. Secondly the connection between important behavioral phenotypes and genotypes at non-neutral marker Pan I was determined, using current-day genetic material. This analysis showed that the Pan IAA homozygotes could be assigned to a “coastal” type that appeared to follow seasonal trend in temperature, foraging in relatively shallow waters. On the other hand, most Pan IBB homozygotes were assigned to “frontal” type that is characterized by migrating to colder and deeper waters during feeding migration. For the main part of the thesis historical data set of archived otoliths collected between 1948 and 2002 was used to jointly examine phenotypic and genetic data with the goal to examine historical trends in the genetic composition of the Icelandic cod stock. This analysis showed that there have been major changes in the genetic variation at the Pan I locus of Icelandic cod during the latter part of last century. These have occurred alongside changes in fishing patterns and pressure, and age ... |
author2 |
Háskóli Íslands |
format |
Doctoral or Postdoctoral Thesis |
author |
Klara Björg Jakobsdóttir 1968- |
author_facet |
Klara Björg Jakobsdóttir 1968- |
author_sort |
Klara Björg Jakobsdóttir 1968- |
title |
Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland |
title_short |
Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland |
title_full |
Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland |
title_fullStr |
Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland |
title_full_unstemmed |
Langtímabreytileiki í erfðasamsetningu þorsks (Gadus morhua L.) við Ísland |
title_sort |
langtímabreytileiki í erfðasamsetningu þorsks (gadus morhua l.) við ísland |
publishDate |
2013 |
url |
http://hdl.handle.net/1946/13858 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
http://hdl.handle.net/1946/13858 |
_version_ |
1766357914527727616 |