Genetic differentiation between close eastern Mediterranean <i>Dicentrarchus labrax </i>(L.) populations

Castilho, Rita; Çi̇ftçi, Yılmaz

doi:10.1111/j.1095-8649.2005.00869.x

Cited by 23 publications

(22 citation statements)

References 23 publications

(32 reference statements)

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“…The Messolonghi fish has two genetic backgrounds, which might be attributed to escapees from local aquaculture (Dimitriou et al ., ). The above average genetic distances observed by (Bahri‐Sfar et al ., ; Castilho & Ciftci, ; Quéré et al ., ) fit the isolation by distance pattern we observed. An alternative interpretation that local populations bear the impact of a fragmented geography at low sea‐level stands during the Pleistocene and hence changing currents and water masses (Rohling et al ., ) seems less likely.…”

Section: Discussionsupporting

confidence: 78%

“…Samples collected along the Atlantic coasts north of Portugal (Fritsch et al ., ; Quéré et al ., ; Coscia & Mariani, ; Coscia et al ., ) do not show any structure, except for the British Isles (Child, ) where a genetic difference was identified at the PGM locus between juvenile populations from the Irish Sea and coastal UK. The western Mediterranean population is not genetically structured (Naciri et al ., ; Quéré et al ., ), while the Eastern Mediterranean contains more patchy populations (Bahri‐Sfar et al ., ; Castilho & Ciftci, ; Quéré et al ., ), with very limited differentiation (< 2%; Bahri‐Sfar et al ., ; Quéré et al ., ). Hence, similar to many other marine fishes (e.g.…”

Section: Introductionmentioning

confidence: 98%

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Range-wide population structure of European sea bassDicentrarchus labrax

Souche

Hellemans

Babbucci

et al. 2015

Biol. J. Linn. Soc.

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The euryhaline European sea bass Dicentrarchus labrax L., inhabiting the coasts of the eastern Atlantic Ocean and Mediterranean Sea, has had many opportunities for differentiation throughout its large natural range. However, evidence for this has been incompletely documented geographically and with an insufficient number of markers. Therefore, its full range was sampled at 22 sites and individuals were genotyped with a suite of mapped markers, including 14 microsatellite loci (N = 536) and 46 neutral or gene‐linked single nucleotide polymorphisms (SNPs; N = 644). We confirm that the Atlantic and Mediterranean basins harbour two distinct lineages. Within the Atlantic Ocean no pattern was obvious based on the microsatellite and SNP genotypes, except for a subtle difference between South‐eastern and North‐eastern Atlantic sea bass attributed to limited introgression of alleles of Mediterranean origin. SNP genotypes of the Mediterranean lineage differentiated into three groups, probably under the influence of geographical isolation. The Western Mediterranean group showed genetic homogeneity without evidence for outlier loci. The Adriatic group appeared as a distinct unit. The Eastern Mediterranean group showed a longitudinal gradient of genotypes and most interestingly an outlier locus linked to the somatolactin gene. Overall, the spatial pattern fits those observed with other taxa of between‐basin segregation and within‐basin connectivity, which concurs well with the swimming capabilities of European sea bass. Evidence from a few outlier loci in this and other studies encourages further exploration of its regional connectivity and adaptive evolution.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 98%

Range-wide population structure of European sea bassDicentrarchus labrax

Souche

Hellemans

Babbucci

et al. 2015

Biol. J. Linn. Soc.

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“…; Bahri‐Sfar et al. ; Castilho and Ciftci ), nor the existence of three metapopulations. Nevertheless, estimates of differentiation among successive pairs of basins were larger than previously estimated with fewer microsatellite loci.…”

Section: Discussionmentioning

confidence: 97%

“…; Coscia and Mariani ), while the less well‐studied EM basin is more structured (Bahri‐Sfar et al. ; Castilho and Ciftci ). The genetic transitions over the range are each coincident with an oceanic front (the Almeria‐Oran front [AOF] and the Siculo‐Tunisian Strait [STS]).…”

Section: Introductionmentioning

confidence: 99%

Gene flow at major transitional areas in sea bass (Dicentrarchus labrax) and the possible emergence of a hybrid swarm

Quéré

Desmarais

Tsigenopoulos

et al. 2012

Ecology and Evolution

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The population genetic structure of sea bass (Dicentrarchus labrax) along a transect from the Atlantic Ocean (AO) to the Eastern Mediterranean (EM) Sea differs from that of most other marine taxa in this area. Three populations (AO, Western Mediterranean [WM], EM) are recognized today, which were originally two allopatric populations. How two ancestral genetic units have evolved into three distinct units has not been addressed yet. Therefore, to investigate mechanisms that lead to the emergence of the central WM population, its current status, and its connectivity with the two parental populations, we applied 20 nuclear loci that were either gene associated or gene independent. Results confirmed the existence of three distinct gene pools, with higher differentiation at two transitional areas, the Almeria-Oran Front (AOF) and of the Siculo-Tunisian Strait (STS), than within any population. Significant linkage disequilibrium and heterozygote excess indicated that the STS is probably another tension zone, as already described for the AOF. Neutrality tests fail to reveal marker loci that could be driven by selection within or among metapopulations, except for locus DLA0068. Collectively, results support that the central WM population arose by trapping two tensions zones at distinct geographic locations of limited connectivity. Population assignment further revealed that WM individuals were more introgressed than individuals from the other two metapopulations. This suggests that this population might result from hybrid swarming, and was or is still seeded by genes received through the filter of each tension zone.

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“…However, genetic identification is considered the most informative method of determining the fate of escapees in the long term, as it is not subject to environmentally induced changes and also allows for the identification of descendants of escaped fish (Blohm et al 2007). Genetic markers have revealed significant population structuring of seabass in the Mediterranean Sea, including confirmation of distinct populations in the East and West basins (Garcia de Leon et al 1997, Naciri et al 1999) and also possible further structuring of the Eastern population (Bahri-Sfar et al 2000) located around the Levantine basin (Castilho & Ciftci, 2005). The transfer of fish between geographical areas is common practice and could result in pronounced changes to native populations if fish escape introgression occurs (Glover et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Prevalence and survival of escaped European seabass Dicentrarchus labrax in Cyprus identified using genetic markers

Brown¹,

Miltiadou²,

Tsigenopoulos³

2015

Aquacult. Environ. Interact.

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The escape of European seabass Dicentrarchus labrax (L.) from fish farms is considered to be a widespread problem in the Mediterranean area, where this species is produced in large quantities in offshore cages. Whilst estimates of the number of escaped seabass in the wild have been made previously, the actual distribution, long-term survival and the potential effects on native populations remain largely unknown. This study characterises the genetic profiles of all contemporary and some historic aquaculture sources of European seabass in Cyprus and uses these profiles to identify escaped fish in seabass collected from the wild around the island. Significant differences in the microsatellite and mitochondrial DNA marker profiles were found between farmed and wild fish. The number of escapees identified was 15% of the total number of wild-caught fish sampled. However, escapees were not equally distributed; at one location ~70% of wild-caught fish were escapees while in other areas escapees only accounted for up to 4%. Escapees were present in all size classes of fish, but the majority were of commercial size (300−500 g) typical of seabass farmed in seacages. This indicates that they may have escaped recently and during normal aquaculture operations as no escape event was reported in the course of the study. Two large, egg-bearing females and some juvenile fish were also classified as escapees, which suggests that long-term survival and interbreeding with wild fish is possible in Cypriot waters.

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Genetic differentiation between close eastern Mediterranean Dicentrarchus labrax (L.) populations

Abstract: Differentiation at nine microsatellite loci revealed that a Levantine Basin sea bass Dicentrarchus labrax population probably represents a further subdivision of this species in the eastern Mediterranean. # 2005 The Fisheries Society of the British Isles

Cited by 23 publications

References 23 publications

Range-wide population structure of European sea bassDicentrarchus labrax

Range-wide population structure of European sea bassDicentrarchus labrax

Gene flow at major transitional areas in sea bass (Dicentrarchus labrax) and the possible emergence of a hybrid swarm

Prevalence and survival of escaped European seabass Dicentrarchus labrax in Cyprus identified using genetic markers

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