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Outlier SNP markers reveal fine-scale genetic structuring across European hake populations (Merluccius merluccius).
Mol Ecol. 2014 Jan; 23(1):118-35.ME

Abstract

Shallow population structure is generally reported for most marine fish and explained as a consequence of high dispersal, connectivity and large population size. Targeted gene analyses and more recently genome-wide studies have challenged such view, suggesting that adaptive divergence might occur even when neutral markers provide genetic homogeneity across populations. Here, 381 SNPs located in transcribed regions were used to assess large- and fine-scale population structure in the European hake (Merluccius merluccius), a widely distributed demersal species of high priority for the European fishery. Analysis of 850 individuals from 19 locations across the entire distribution range showed evidence for several outlier loci, with significantly higher resolving power. While 299 putatively neutral SNPs confirmed the genetic break between basins (F(CT) = 0.016) and weak differentiation within basins, outlier loci revealed a dramatic divergence between Atlantic and Mediterranean populations (F(CT) range 0.275-0.705) and fine-scale significant population structure. Outlier loci separated North Sea and Northern Portugal populations from all other Atlantic samples and revealed a strong differentiation among Western, Central and Eastern Mediterranean geographical samples. Significant correlation of allele frequencies at outlier loci with seawater surface temperature and salinity supported the hypothesis that populations might be adapted to local conditions. Such evidence highlights the importance of integrating information from neutral and adaptive evolutionary patterns towards a better assessment of genetic diversity. Accordingly, the generated outlier SNP data could be used for tackling illegal practices in hake fishing and commercialization as well as to develop explicit spatial models for defining management units and stock boundaries.

Authors+Show Affiliations

Department of Biological, Geological and Environmental Sciences, University of Bologna, via Selmi 3, 40126, Bologna, Italy.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24138219

Citation

Milano, Ilaria, et al. "Outlier SNP Markers Reveal Fine-scale Genetic Structuring Across European Hake Populations (Merluccius Merluccius)." Molecular Ecology, vol. 23, no. 1, 2014, pp. 118-35.
Milano I, Babbucci M, Cariani A, et al. Outlier SNP markers reveal fine-scale genetic structuring across European hake populations (Merluccius merluccius). Mol Ecol. 2014;23(1):118-35.
Milano, I., Babbucci, M., Cariani, A., Atanassova, M., Bekkevold, D., Carvalho, G. R., Espiñeira, M., Fiorentino, F., Garofalo, G., Geffen, A. J., Hansen, J. H., Helyar, S. J., Nielsen, E. E., Ogden, R., Patarnello, T., Stagioni, M., Tinti, F., & Bargelloni, L. (2014). Outlier SNP markers reveal fine-scale genetic structuring across European hake populations (Merluccius merluccius). Molecular Ecology, 23(1), 118-35. https://doi.org/10.1111/mec.12568
Milano I, et al. Outlier SNP Markers Reveal Fine-scale Genetic Structuring Across European Hake Populations (Merluccius Merluccius). Mol Ecol. 2014;23(1):118-35. PubMed PMID: 24138219.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Outlier SNP markers reveal fine-scale genetic structuring across European hake populations (Merluccius merluccius). AU - Milano,Ilaria, AU - Babbucci,Massimiliano, AU - Cariani,Alessia, AU - Atanassova,Miroslava, AU - Bekkevold,Dorte, AU - Carvalho,Gary R, AU - Espiñeira,Montserrat, AU - Fiorentino,Fabio, AU - Garofalo,Germana, AU - Geffen,Audrey J, AU - Hansen,Jakob H, AU - Helyar,Sarah J, AU - Nielsen,Einar E, AU - Ogden,Rob, AU - Patarnello,Tomaso, AU - Stagioni,Marco, AU - ,, AU - Tinti,Fausto, AU - Bargelloni,Luca, Y1 - 2013/11/18/ PY - 2013/07/23/received PY - 2013/10/14/revised PY - 2013/10/16/accepted PY - 2013/10/22/entrez PY - 2013/10/22/pubmed PY - 2014/3/29/medline KW - environmental correlation KW - genome scan KW - local adaptation KW - outlier SNPs KW - salinity KW - temperature SP - 118 EP - 35 JF - Molecular ecology JO - Mol Ecol VL - 23 IS - 1 N2 - Shallow population structure is generally reported for most marine fish and explained as a consequence of high dispersal, connectivity and large population size. Targeted gene analyses and more recently genome-wide studies have challenged such view, suggesting that adaptive divergence might occur even when neutral markers provide genetic homogeneity across populations. Here, 381 SNPs located in transcribed regions were used to assess large- and fine-scale population structure in the European hake (Merluccius merluccius), a widely distributed demersal species of high priority for the European fishery. Analysis of 850 individuals from 19 locations across the entire distribution range showed evidence for several outlier loci, with significantly higher resolving power. While 299 putatively neutral SNPs confirmed the genetic break between basins (F(CT) = 0.016) and weak differentiation within basins, outlier loci revealed a dramatic divergence between Atlantic and Mediterranean populations (F(CT) range 0.275-0.705) and fine-scale significant population structure. Outlier loci separated North Sea and Northern Portugal populations from all other Atlantic samples and revealed a strong differentiation among Western, Central and Eastern Mediterranean geographical samples. Significant correlation of allele frequencies at outlier loci with seawater surface temperature and salinity supported the hypothesis that populations might be adapted to local conditions. Such evidence highlights the importance of integrating information from neutral and adaptive evolutionary patterns towards a better assessment of genetic diversity. Accordingly, the generated outlier SNP data could be used for tackling illegal practices in hake fishing and commercialization as well as to develop explicit spatial models for defining management units and stock boundaries. SN - 1365-294X UR - https://www.unboundmedicine.com/medline/citation/24138219/Outlier_SNP_markers_reveal_fine_scale_genetic_structuring_across_European_hake_populations__Merluccius_merluccius__ L2 - https://doi.org/10.1111/mec.12568 DB - PRIME DP - Unbound Medicine ER -