Genetic differentiation among Atlantic cod in south and south‐east Icelandic waters: synaptophysin (<i>Syp</i> I) and haemoglobin (<i>HbI</i>) variation

Jónsdóttir, Ólöf Dóra Bartels; Imsland, Albert K.; Daníelsdóttir, Anna Kristín; Þorsteinsson, Vilhjálmur; Nævdal, Gunnar

doi:10.1111/j.1095-8649.1999.tb02053.x

Cited by 40 publications

(34 citation statements)

References 51 publications

(73 reference statements)

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“…During the spawning season, the majority of the Pan I AA homozygotes were caught in shallow waters (\125 m) while Pan I BB homozygotes were captured in deeper waters ([125 m), hence confirming recent genetic and biological observations (Jónsdóttir et al 1999(Jónsdóttir et al , 2006a. In the Northeast Atlantic region, one of the most striking results concerning the Pan I locus is the allelic distribution, e.g., the almost exclusive presence of Pan I A and Pan I B alleles in coastal and offshore spawning populations respectively (Jónsdóttir et al 1999;Sarvas and Fevolden 2005).…”

Section: Introductionsupporting

confidence: 85%

Are Vertical Behaviour Patterns Related to the Pantophysin Locus in the Atlantic Cod (Gadus morhua L.)?

et al. 2007

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Throughout their geographic distribution, marine fish species often form subpopulations with limited connectivity, among which individuals display a variety of migratory behaviours. Fish behaviour experiments using Data Storage Tags (DSTs) have been useful to define the natural movement of individuals. In Icelandic waters, such experiments have indicated the presence of two distinct behaviour types of the Atlantic cod Gadus morhua, related to vertical migrations and habitat choice in feeding migrations. Some individuals have been shown to stay most of the time in shallow waters characterised by the seasonal trend in temperature for the shelf waters, while other migrate to deeper and colder waters where most of them forage in temperature fronts characterized by highly variable temperatures. The analysis of the pantophysin locus (Pan I) of the same individuals revealed that individuals carrying the Pan I AA genotype are likely to display a shallow water feeding migrations while individuals carrying the Pan I BB genotype preferred deeper waters and forage near thermal fronts. The heterozygote exhibited both type of behaviours. This study therefore suggests that further research need to be done on the pantophysin locus and its potential effects on cod phenotypes to assess the potential relationship between this locus and the behavioural types described.

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Section: Introductionsupporting

confidence: 85%

Are Vertical Behaviour Patterns Related to the Pantophysin Locus in the Atlantic Cod (Gadus morhua L.)?

et al. 2007

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“…It is also larger than differences reported for Pan I between inshore and offshore cod in other regions, e.g . eastern Canada (Beacham et al ., 2002) and Iceland (Jónsdóttir et al ., 1999, 2001). By comparing the Pan I A frequencies in the present study to previous studies of Hb ‐I 1 allele frequencies (Frydenberg et al ., 1965; Møller, 1968) and blood type E frequencies (Møller, 1968) along the Norwegian coast and the Barents Sea, significant correlations were found ( Pan I A and Hb ‐I 1 , r s = 0·78, d.f.…”

Section: Discussionmentioning

confidence: 99%

“…Since the first report on variation in the cod Gadus morhua L. at the pantophysin ( Pan I) locus (Pogson et al ., 1995; the locus referred to as GM798 in that paper), compelling evidence has accumulated about the uniqueness of this gene in terms of displaying among‐population divergence in cod (Fevolden & Pogson, 1995, 1997; Jónsdóttir et al ., 1999, 2001; Pogson, 2001; Pogson & Fevolden, 2003). The Pan I gene, initially identified as the cod synaptophysin ( Syp I) locus (Fevolden & Pogson, 1997) but more likely to represent the isoform pantophysin (Haass et al ., 1996; Pogson, 2001), has particularly been used in attempts to separate populations of cod in the north‐east Atlantic, a subject that is still controversial (in part due to disagreement in management policy).…”

Section: Introductionmentioning

confidence: 99%

Pantophysin (Pan I) locus divergence between inshore v. offshore and northern v. southern populations of Atlantic cod in the north‐east Atlantic

Sarvas

Fevolden

2005

Journal of Fish Biology

108

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More than 6000 cod Gadus morhua, sampled in coastal and offshore waters stretching from the Barents Sea down to the North Sea, were analysed for frequencies of alleles at the scnDNA pantophysin locus (Pan I) [formerly called synaptophysin (Syp I)]. The significant allele frequency difference between the two major stocks of cod in Norway, north-east Arctic cod (NEAC) and Norwegian coastal cod (NCC), was upheld in all years of the investigation (1993 to 2001), and applied both to larval cod and post-juveniles of various ages. On a north-south axis, the appearance of a latitudinal cline of post-juvenile (!1 year) allele frequencies was exposed. The intermediate allele frequencies in coastal areas of northern Norway, seem to a large extent to be caused by intermingling of the two stocks, although the existence of populations of coastal cod with alternative Pan I frequencies could not be ruled out. The role of selection is yet unresolved. Depth of the sampling location seemed to have an effect on the allele frequencies and their temporal stability, while there was no indication of seasonal variation in the frequencies. Breeding structure was the most likely cause for upholding the extreme divergence in Pan I frequencies between NEAC and NCC. # 2005 The Fisheries Society of the British Isles

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“…Also, the skewed Pan I allelic distribution for the two ecotypes seems to be consistent across the northern Atlantic, though being the most pronounced for NC and NA cod in the Northeast Atlantic (Jónsdóttir et al . , ; Beacham et al . ; Sarvas & Fevolden ; Pampoulie et al .…”

Section: Introductionmentioning

confidence: 99%

Genomic divergence between the migratory and stationary ecotypes of Atlantic cod

et al. 2013

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Atlantic cod displays a range of phenotypic and genotypic variations, which includes the differentiation into coastal stationary and offshore migratory types of cod that co-occur in several parts of its distribution range and are often sympatric on the spawning grounds. Differentiation of these ecotypes may involve both historical separation and adaptation to ecologically distinct environments, the genetic basis of which is now beginning to be unravelled. Genomic analyses based on recent sequencing advances are able to document genomic divergence in more detail and may facilitate the exploration of causes and consequences of genome-wide patterns. We examined genomic divergence between the stationary and migratory types of cod in the Northeast Atlantic, using next-generation sequencing of pooled DNA from each of two population samples. Sequence data was mapped to the published cod genome sequence, arranged in more than 6000 scaffolds (611 Mb). We identified 25 divergent scaffolds (26 Mb) with a higher than average gene density, against a backdrop of overall moderate genomic differentiation. Previous findings of localized genomic divergence in three linkage groups were confirmed, including a large (15 Mb) genomic region, which seems to be uniquely involved in the divergence of migratory and stationary cod. The results of the pooled sequencing approach support and extend recent findings based on single-nucleotide polymorphism markers and suggest a high degree of reproductive isolation between stationary and migratory cod in the North-east Atlantic.

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

Cited by 40 publications

References 51 publications

Are Vertical Behaviour Patterns Related to the Pantophysin Locus in the Atlantic Cod (Gadus morhua L.)?

Are Vertical Behaviour Patterns Related to the Pantophysin Locus in the Atlantic Cod (Gadus morhua L.)?

Pantophysin (Pan I) locus divergence between inshore v. offshore and northern v. southern populations of Atlantic cod in the north‐east Atlantic

Genomic divergence between the migratory and stationary ecotypes of Atlantic cod

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