Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6770
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Funding
- MARINE GENOMICS EUROPE [EU-FP6 505403]
- Max Planck Society
- French ANR [LABRAD-SEQ 11-PDOC-009-01, REGULBASS 09-GENM-003]
- Veneto Region [Progetto 12/MI/2004]
- Foundation for Science and Technology of Portugal [SFRH/BPD/66742/2009, SFRH/BPD/89889/2012]
- [LIFECYCLE EU-FP7 222719]
- [BMBF-01GS0805]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/89889/2012, SFRH/BPD/66742/2009] Funding Source: FCT
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The European sea bass (Dicentrarchus labrax) is a temperate-zone euryhaline teleost of prime importance for aquaculture and fisheries. This species is subdivided into two naturally hybridizing lineages, one inhabiting the north-eastern Atlantic Ocean and the other the Mediterranean and Black seas. Here we provide a high-quality chromosome-scale assembly of its genome that shows a high degree of synteny with the more highly derived teleosts. We find expansions of gene families specifically associated with ion and water regulation, highlighting adaptation to variation in salinity. We further generate a genome-wide variation map through RAD-sequencing of Atlantic and Mediterranean populations. We show that variation in local recombination rates strongly influences the genomic landscape of diversity within and differentiation between lineages. Comparing predictions of alternative demographic models to the joint allele-frequency spectrum indicates that genomic islands of differentiation between sea bass lineages were generated by varying rates of introgression across the genome following a period of geographical isolation.
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