Allozyme variation in turbot (Psetta maxima) and brill (Scophthalmus rhombus) (Osteichthyes, Pleuronectoformes, Scophthalmidae) throughout their range in Europe

Blanquer, A.; Alayse, J.-P.; Berrada-Rkhami, O.; Berrebi, Patrick

doi:10.1111/j.1095-8649.1992.tb02702.x

Cited by 84 publications

(64 citation statements)

References 16 publications

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“…This was also the only locus where a significant differentiation between male and female subsamples was detected in this population. The F ST value (4.1%) is close to that previously estimated among populations in the natural distribution of turbot, including the Atlantic Ocean and Mediterranean Sea areas (5-7%; Blanquer et al 1992;Bouza et al 1997). These observations support the close vicinity of the SmaUSC-E30 marker to the SDg in turbot, considering that the break in association between a pair of loci is directly related to the recombination frequency.…”

Section: Discussionsupporting

confidence: 73%

“…However, these could be occurring at a finer scale as the significant genetic differentiation (F ST ¼ 4.1%) at SmaUSC-E30 between males and females suggests. The brill (S. rhombus), a close related species according to genetic data (Blanquer et al 1992;Pardo et al 2001;Bouza et al 2002), did not show any chromosome heteromorphism, and its mitotic karyotype was not distinguishable from that of turbot (Pardo et al 2001). Remarkably, hybrid crosses between female brill 3 male turbot produce nearly all-male populations (Purdom and Thacker 1980).…”

Section: Discussionmentioning

confidence: 99%

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Identification of the Major Sex-Determining Region of Turbot (Scophthalmus maximus)

et al. 2009

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Sex determination in fish is a labile character in evolutionary terms. The sex-determining (SD) master gene can differ even between closely related fish species. This group is an interesting model for studying the evolution of the SD region and the gonadal differentiation pathway. The turbot (Scophthalmus maximus) is a flatfish of great commercial value, where a strong sexual dimorphism exists for growth rate. Following a QTL and marker association approach in five families and a natural population, we identified the main SD region of turbot at the proximal end of linkage group (LG) 5, close to the SmaUSC-E30 marker. The refined map of this region suggested that this marker would be 2.6 cM and 1.4 Mb from the putative SD gene. This region appeared mostly undifferentiated between males and females, and no relevant recombination frequency differences were detected between sexes. Comparative genomics of LG5 marker sequences against five model species showed no similarity of this chromosome to the sex chromosomes of medaka, stickleback, and fugu, but suggested a similarity to a sex-associated QTL from Oreochromis spp. The segregation analysis of the closest markers to the SD region demonstrated a ZW/ZZ model of sex determination in turbot. A small proportion of families did not fit perfectly with this model, which suggests that other minor genetic and/or environmental factors are involved in sex determination in this species.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Identification of the Major Sex-Determining Region of Turbot (Scophthalmus maximus)

et al. 2009

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“…The only study exploring genetic structure in turbot covering a roughly similar distribution range was based on allozyme marker data (Blanquer et al., 1992). The reported global population differentiation ( F ST = 0.070) was similar to the current study ( F ST = 0.090), especially considering that the allozyme study did not include the Black Sea.…”

Section: Discussionmentioning

confidence: 99%

Parallel evolution and adaptation to environmental factors in a marine flatfish: Implications for fisheries and aquaculture management of the turbot (Scophthalmus maximus)

Prado

Vera

Hermida

et al. 2018

Evolutionary Applications

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Unraveling adaptive genetic variation represents, in addition to the estimate of population demographic parameters, a cornerstone for the management of aquatic natural living resources, which, in turn, represent the raw material for breeding programs. The turbot (Scophthalmus maximus) is a marine flatfish of high commercial value living on the European continental shelf. While wild populations are declining, aquaculture is flourishing in southern Europe. We evaluated the genetic structure of turbot throughout its natural distribution range (672 individuals; 20 populations) by analyzing allele frequency data from 755 single nucleotide polymorphism discovered and genotyped by double‐digest RAD sequencing. The species was structured into four main regions: Baltic Sea, Atlantic Ocean, Adriatic Sea, and Black Sea, with subtle differentiation apparent at the distribution margins of the Atlantic region. Genetic diversity and effective population size estimates were highest in the Atlantic populations, the area of greatest occurrence, while turbot from other regions showed lower levels, reflecting geographical isolation and reduced abundance. Divergent selection was detected within and between the Atlantic Ocean and Baltic Sea regions, and also when comparing these two regions with the Black Sea. Evidence of parallel evolution was detected between the two low salinity regions, the Baltic and Black seas. Correlation between genetic and environmental variation indicated that temperature and salinity were probably the main environmental drivers of selection. Mining around the four genomic regions consistently inferred to be under selection identified candidate genes related to osmoregulation, growth, and resistance to diseases. The new insights are useful for the management of turbot fisheries and aquaculture by providing the baseline for evaluating the consequences of turbot releases from restocking and farming.

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“…Several other studies also based a population analysis on few loci, some not particularly highly polymorphic (e.g. Blanquer et al, 1992;Castilho and McAndrew, 1998;Chaplin et al, 1998). For this analysis allele relative mobility assignments were made.…”

Section: Methodsmentioning

confidence: 99%

Genetic differentiation of Solea solea (Linnaeus, 1758) and Solea senegalensis Kaup, 1858, (Pisces: Pleuronectiformes) from several estuarine systems of the Portuguese coast

Cabral¹,

Castro²,

Linhares³

et al. 2003

Sci. Mar.

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SUMMARY:The genetic differentiation of Solea solea and Solea senegalensis from several estuarine systems along the Portuguese coast was studied. Nine polymorphic isozyme loci (ACP-1*, ACP-2*, GPI-1*, GPI-2*, sMDH*, ME-1*, ME-2*, MPI* and PGM*) were analysed using starch gel electrophoresis and isoelectric focusing. Differentiation between the species was high (mean average Nei distance of 0.93). The most efficient loci in the diagnosis of the two species were ACP-1*, ME-2* and GPI-2*. S. solea showed a higher genetic diversity than S. senegalensis. Within each species a low genetic differentiation between the samples analysed was found. Although with a low magnitude the interpopulational genetic differentiation of S. solea was higher than that of S. senegalensis. This could probably be explained by some particularities of the life cycles of these species, namely the more extended period of occurrence of larval stages of S. senegalensis in the plankton. Although no clear evidence about the population structure model emerged from the analysis of several Atlantic and Mediterranean populations of S. solea, the significant correlations obtained between genetic and geographical distances support an isolation by distance model.

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Allozyme variation in turbot (Psetta maxima) and brill (Scophthalmus rhombus) (Osteichthyes, Pleuronectoformes, Scophthalmidae) throughout their range in Europe

Cited by 84 publications

References 16 publications

Identification of the Major Sex-Determining Region of Turbot (Scophthalmus maximus)

Identification of the Major Sex-Determining Region of Turbot (Scophthalmus maximus)

Parallel evolution and adaptation to environmental factors in a marine flatfish: Implications for fisheries and aquaculture management of the turbot (Scophthalmus maximus)

Genetic differentiation of <i>Solea solea</i> (Linnaeus, 1758) and <i>Solea senegalensis</i> Kaup, 1858, (Pisces: Pleuronectiformes) from several estuarine systems of the Portuguese coast

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