scholarly journals Genetic differentiation among Atlantic cod (Gadus morhua L.) in Icelandic waters: temporal stability

2001 ◽  
Vol 58 (1) ◽  
pp. 114-122 ◽  
Author(s):  
O Jónsdóttir
Keyword(s):  
Genetic Differentiation ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Temporal Stability ◽  
Icelandic Waters

scholarly journals Historical changes in genotypic frequencies at the Pantophysin locus in Atlantic cod (Gadus morhua ) in Icelandic waters: evidence of fisheries-induced selection?

2011 ◽  
Vol 4 (4) ◽  
pp. 562-573 ◽  
Author(s):  
Klara B. Jakobsdóttir ◽  
Heidi Pardoe ◽  
Árni Magnússon ◽  
Höskuldur Björnsson ◽  
Christophe Pampoulie ◽  
...  
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Historical Changes ◽  
Icelandic Waters

Historical analysis of Pan I in Atlantic cod (Gadus morhua): temporal stability of allele frequencies in the southeastern part of the species distribution

2007 ◽  
Vol 64 (10) ◽  
pp. 1448-1455 ◽  
Author(s):  
Einar Eg Nielsen ◽  
Brian R MacKenzie ◽  
Eydfinn Magnussen ◽  
Dorte Meldrup
Keyword(s):  
Species Distribution ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Temporal Stability ◽  
Historical Analysis ◽  
Allele Frequencies ◽  
Degraded Dna ◽  
Frequency Variation ◽  
Genetic Stock ◽  
Southeastern Part

We investigated temporal genetic differentiation at the pantophysin (Pan I) locus in four Atlantic cod (Gadus morhua) populations from the southeastern part of the species distribution: the Baltic Sea, the North Sea, the Faroe Plateau, and the Faroe Bank. Historical otolith collections enabled investigation of allele frequency variation over time periods up to 69 years employing Pan I primers specifically designed for partially degraded DNA. Small and nonsignificant temporal changes in Pan I allele frequencies were observed in the four populations. Simultaneous microsatellite analysis revealed similar temporal genetic stability with temporal FST values ranging from 0 to 0.006, suggesting limited demographic changes. Sea surface temperature, which has been suggested as the primary driver for the geographical distribution of Pan I alleles in cod, showed no long-term trend although temperature has increased since the mid-1990s. Our study demonstrates that populations in the southeastern part of the species range has been characterized by very high frequencies of the Pan IA allele for many decades, and accordingly, Pan I serves as a reliable marker for genetic stock identification on a macrogeographical scale.

Genetic differentiation among Atlantic cod in south and south-east Icelandic waters: synaptophysin (Syp I) and haemoglobin (HbI) variation

1999 ◽  
Vol 54 (6) ◽  
pp. 1259-1274 ◽  
Author(s):  
O. D. B. Jonsdottir ◽  
A. K. Imsland ◽  
A. K. Danielsdottir ◽  
V. Thorsteinsson ◽  
G. Naevdal
Keyword(s):  
Genetic Differentiation ◽  
Atlantic Cod ◽  
Icelandic Waters

scholarly journals Stock structure of Atlantic cod (Gadus morhua) in West Greenland waters: implications of transport and migration

2004 ◽  
Vol 61 (6) ◽  
pp. 972-982 ◽  
Author(s):  
Marie Storr-Paulsen ◽  
Kai Wieland ◽  
Holger Hovgård ◽  
Hans-Joachim Rätz
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Stock Structure ◽  
West Greenland ◽  
The Past ◽  
Migration Behaviour ◽  
And Migration ◽  
Abundance And Distribution ◽  
Icelandic Waters

Abstract Atlantic cod in West Greenland waters have varied greatly in abundance and distribution in the past decades. Strong year classes yielded good catches inshore and offshore in the late 1980s, but since then cod have been nearly absent offshore and the inshore fishery has been depressed, though there has been a small increase inshore over the past few years. Different components contribute to the Greenland cod stock, and re-analysed tagging experiments indicate that migration behaviour differs between them. Inshore cod are sedentary, with almost no migration between different fjord systems. In contrast, there are many cases of alongshore migration of cod tagged on the offshore fishing banks. Further, observations have been made of occasional migrations from offshore to inshore, notably so in years of good recruitment originating from Icelandic waters.

Genetic Variation in Atlantic Cod (Gadus morhua) Throughout Its Range

1985 ◽  
Vol 42 (10) ◽  
pp. 1580-1587 ◽  
Author(s):  
Jarle Mork ◽  
Nils Ryman ◽  
Gunnar Ståhl ◽  
Fred Utter ◽  
Gunnar Sundnes
Keyword(s):  
Genetic Differentiation ◽  
Gadus Morhua ◽  
Barents Sea ◽  
Atlantic Cod ◽  
Geographic Distance ◽  
Absolute Amount ◽  
Significant Heterogeneity ◽  
Ecological Barriers ◽  
The Baltic ◽  
Baltic Cod

The amount of genetic differentiation between stocks of Atlantic cod (Gadus morhua) was estimated from electrophoretically detectable protein loci expressed in skeletal muscle and liver. Variant alleles at 13 of these loci were detected among nine samples covering most of the species range: North America, Greenland, Iceland, Barents Sea, Norwegian coastal waters, the North Sea, and the Baltic Sea. A very low amount of genetic differentiation was observed among stocks. Only two loci (LDH-3 and PGI-1) showed large statistically significant heterogeneity of allele frequencies between samples. Standard genetic distances (Nei) between these samples based on 10 variable loci ranged from 0.00015 to 0.01072 with Baltic cod as the genetically most divergent sample. There was a highly significant correlation between genetic and geographic distance for the samples from the Atlantic suggesting that a substantial gene flow has occurred between these stocks with geographic distance being an inhibiting factor. The relatively larger genetic distance between the Baltic cod and other stocks may reflect isolation resulting from geographic and perhaps ecological barriers. However, the absolute amount of genetic differentiation in the Atlantic cod appears to be very low throughout its range.

Effects of temperature on life history set the sensitivity to fishing in Atlantic cod Gadus morhua

2014 ◽  
Vol 514 ◽  
pp. 217-229 ◽  
Author(s):  
HY Wang ◽  
LW Botsford ◽  
JW White ◽  
MJ Fogarty ◽  
F Juanes ◽  
...  
Keyword(s):  
Life History ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Effects Of Temperature

Responses of Atlantic cod Gadus morhua head kidney leukocytes to phytase produced by gastrointestinal-derived bacteria

2009 ◽  
Vol 36 (4) ◽  
pp. 883-891 ◽  
Author(s):  
Carlo C. Lazado ◽  
Christopher Marlowe A. Caipang ◽  
Sanchala Gallage ◽  
Monica F. Brinchmann ◽  
Viswanath Kiron
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Head Kidney
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