Genetic Differences between Cod Groups in the Lofoten Area

Möller, Dag

doi:10.1038/212824a0

Cited by 52 publications

(32 citation statements)

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“…The distribution of haemoglobin allele frequencies was also significantly different in the two groups, in accordance with earlier studies (Møller, 1966;Dahle & Jørstad, 1993;Nordeide & Pettersen, 1998). Thus the present data have given strong support for the suggestion that two genetically different groups of Atlantic cod spawn in the Lofoten area.…”

Section: Discussionsupporting

confidence: 93%

“…The results both from otolith classification and the genetic analyses confirmed earlier reports of concurrent presence of more than one group of cod present at the Lofoten spawning grounds (Rollefsen, 1954;Hylen, 1964;Møller, 1966;Nordeide, 1998). The model based clustering conducted in STRUCTURE, using all markers, indicated that the most likely number of groups was two, though further structuring within these groups cannot be excluded.…”

Section: Discussionsupporting

confidence: 83%

“…In the 1960s genetic analysis based on blood groups (Møller, 1966) and blood proteins (Frydenberg et al, 1965;Møller, 1968) supported the view that cod could be divided into migratory Arctic cod, and more stationary coastal cod. However, Frydenberg et al (1969) argued that the variation in frequency of one of the blood proteins (haemoglobin-Hb I) along the Norwegian coast could also be explained by selection from different environmental conditions.…”

Section: Introductionmentioning

confidence: 95%

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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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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 95%

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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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“…1). NC inhabit coastal areas and fjords, migrate short distances and spawn along most parts of the Norwegian coast (Rollefsen 1954, Jakobsen 1987, including the Lofoten Islands (Hylen 1964, Møller 1966, 1968. In fact, ripe individuals of both NC and NA are found in the same catches at the spawning grounds off Lofoten .…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics include body growth, sexual maturation, body shape (K-factor), number of vertebrae, allozymes and isozymes, blood types, haemoglobin, and DNA polymorphisms of the nuclear and mitochondrial genomes (for references see Table 1). In addition to the pioneering work on otoliths by Rollefsen (1933), the discovery of some genetic markers with significant differences in frequency between NA and NC, especially haemoglobin (Møller 1966) and Pan I (Fevolden & Pogson 1995), created enthusiasm and nourished a number of studies on cod in the NE Atlantic (see Table 1). Descriptive field studies have dominated, although some field and laboratory experiments have been carried out as well.…”

Section: Introductionmentioning

confidence: 99%

Population connectivity among migratory and stationary cod Gadus morhua in the Northeast Atlantic—A review of 80 years of study

Nordeide¹,

Johansen²,

Jørgensen³

et al. 2011

Mar. Ecol. Prog. Ser.

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The population structure of Atlantic cod Gadus morhua L. in the Barents Sea and in fjords and coastal waters in Norway and northwestern Russia has been a controversial subject since the 1930s. Eight decades of scientific inquiry have compared migratory NE Arctic (NA) and stationary Norwegian and Russian coastal cod (NC). At one extreme the existence of 2 non-interbreeding groups is advocated, whereas others find support for low genetic differentiation due to substantial gene flow, with geographical distance being the limiting factor. We review studies of a wide range of phenotypic (e.g. growth, maturation, counts of vertebrae) and polymorphic genetic markers (e.g. allozymes, mtDNA, microsatellites, single nucleotide polymorphisms). Regardless of whether or not the observed differences have a genetic basis, 70% of the 54 reviewed papers conclude that NA and NC differ with respect to the characters studied. However, few papers remain after exclusion of those relying on characteristics or markers that are generally agreed to be subject to selection and therefore less suited to assessing population connectivity. The lack of studies examining the potential influence of environments on growth of annual zones in otoliths is surprising, since otoliths are used to categorize specimens in managing the NA and NC and in scientific papers. We conclude that it is still an open question whether NA and NC effectively make up 1 large population or >1 non-interbreeding 'groups'. As next-generation sequencing technology transforms 'population genetics' into 'population genomics', we will move towards a better understanding of differentiation among fish populations.

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Migration

Righton

Metcalfe

2018

Atlantic Cod

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Genetic Differences between Cod Groups in the Lofoten Area

Cited by 52 publications

References 1 publication

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

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

Population connectivity among migratory and stationary cod Gadus morhua in the Northeast Atlantic—A review of 80 years of study

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