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

Jónsdóttir, Ólöf Dóra Bartels

doi:10.1006/jmsc.2000.0995

Cited by 51 publications

(46 citation statements)

References 45 publications

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“…However, such findings indicate that vertical structuring does occur, providing a plausible explanation for the extensive allelic variation in Icelandic populations and the Balsfjord samples of Fevolden & Pogson (1997). The results of Jónsdóttir et al (2001) also support such an assertion, showing considerably higher Pan I A allele frequency at Loftsta7ahraun (50 to 70 m) compared to Kantur (150 to 450 m). It is noteworthy that these populations were sampled during the spawning season and that depth differences between the populations are likely to be even further accentuated outside the spawning season (Pálsson & Thorsteinsson 2003).…”

Section: Maintenance Of Pan I Allele Frequency Transition Zonesmentioning

confidence: 64%

Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua

Case¹,

Hutchinson²,

Hauser³

et al. 2005

Mar. Ecol. Prog. Ser.

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Using samples of Atlantic cod Gadus morhua L. from the North Sea, and previously published genetic data from the Irish and Celtic Seas, Iceland, and Norwegian fjord and offshore populations, we describe striking macro-and micro-geographic patterns in pantophysin (Pan I) allele frequencies. The relatively abrupt discontinuity in Pan I allele frequency distribution at 2 different locations is not congruent with standard patterns of isolation by distance and could arise from population admixtures, historical or contemporary natural selection, behavioural segregation or a combination of these factors. Here, we examined the relationships between the distributions of Pan I alleles and temperature, salinity and depth. In the northeast Atlantic, temperature was highly correlated with Pan I allele frequency, even when the effect of geographic distance was removed. In the Norwegian fjords, partial Mantel tests indicated that temperature, salinity and depth all had a significant effect on Pan I allele frequency in juvenile fish. However, a sample from the brackish waters of the eastern Baltic Sea suggested that salinity may be linked to Pan I allele frequency distribution and that the relationship with temperature was weaker in areas of low salinity. Strong correlations between Pan I allele frequencies and key environmental variables, together with evidence from the available literature, suggested that environmental conditions play an important role in determining the distribution of different Pan I genotypes. The combined use of environmental data, Pan I genotyping and neutral markers may provide a valuable approach to examine local adaptation, levels of gene flow and stock structuring.

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Section: Maintenance Of Pan I Allele Frequency Transition Zonesmentioning

confidence: 64%

Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua

Case¹,

Hutchinson²,

Hauser³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…Studies employing allozyme markers have shown relatively limited variation among cod populations along the Norwegian coast, and also between NCC and NEAC (Jørstad, 1984;Mork et al, 1985;Jørstad & Naevdal, 1989;Mork & Giaever, 1999). More recent studies employing various DNA markers have yielded results ranging from panmixia or high gene flow (mtDNA) across much of the Atlantic (Smith et al, 1989;Dahle, 1991;Arnason et al, 1992Arnason et al, , 2000 to the presence of significant population structuring (microsatellite DNA, scnDNA) on small to medium spatial scales (Fevolden & Pogson, 1997;Hutchinson et al, 2001;Jonsdottir et al, 2001;Knutsen et al, 2003;Nielsen et al, 2003;Pogson & Fevolden, 2003;Pampoulie et al, 2006). Similar results have been reported from the western Atlantic, where temporally stable differences between inshore and offshore cod off Newfoundland have been demonstrated (Ruzzante et al, 1996(Ruzzante et al, , 1997(Ruzzante et al, , 1999.…”

Section: Introductionmentioning

confidence: 96%

Mixed stock analysis and the power of different classes of molecular markers in discriminating coastal and oceanic Atlantic cod (Gadus morhua L.) on the Lofoten spawning grounds, Northern Norway

et al. 2008

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Atlantic cod (Gadus morhua) encompasses many different populations or stocks, which in part are managed separately. In the northeast Atlantic cod is divided into two main management units; northeast Arctic cod and coastal cod. These two groups have traditionally been separated by otolith classification. In this study, the power of different classes of genetic markers in separating the two cod groups was investigated. The variation in thirteen genetic markers, including allozymes, haemoglobin, the scDNA locus Pantophysin (Pan I) and a number of microsatellites was investigated, and mixed stock analysis and individual assignment tests were performed on samples comprising a mixture of individuals of putative coastal and oceanic type cod. The genetic analyses showed a large genetic differentiation between outer stations and stations located closer to the mainland shore. Mixed stock analysis and individual assignment tests used for estimation of stock proportions gave results similar to those obtained by otolith classification.

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“…Ruzzante et al 2001), in Icelandic waters (Jonsdottir et al 2001), in the North Sea (Hutchinson et al 2001), and along the Skagerrak coast (Knutsen et al 2003(Knutsen et al , 2004. In some of these studies, it was also shown that differentiation exists between relatively closely occurring subpopulations (Jonsdottir et al 2001, Knutsen et al 2003. For such differentiation to be preserved -even for small genetic differences -reproductive isolation is irrefutably implied.…”

Section: Introductionmentioning

confidence: 98%

Migratory behaviour of Atlantic cod Gadus morhua: natal homing is the prime stock-separating mechanism

Svedäng¹,

Righton²,

Jönsson³

2007

Mar. Ecol. Prog. Ser.

143

118

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

Cited by 51 publications

References 45 publications

Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua

Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua

Mixed stock analysis and the power of different classes of molecular markers in discriminating coastal and oceanic Atlantic cod (Gadus morhua L.) on the Lofoten spawning grounds, Northern Norway

Migratory behaviour of Atlantic cod Gadus morhua: natal homing is the prime stock-separating mechanism

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