Molecular Biology and Evolution · 2024
The Fate of a Polygenic Phenotype Within the Genomic Landscapes of Introgression in the European Seabass Hybrid Zone
In European sea bass, which hybridises naturally, the study examines how selection on a polygenic trait, muscle fat content, shapes introgression between the Atlantic and Mediterranean lineages. Genomic regions associated with this trait carry less Atlantic ancestry in Mediterranean populations.
- The question
- How does selection on a phenotype shape the introgression landscape between the Atlantic and Mediterranean sea bass lineages?
- The approach
- A high-density SNP array to estimate local ancestry along the genome and map muscle fat content, a polygenic trait that differs between lineages, accounting for variation in recombination rate.
- What the article brings
- Atlantic ancestry is purged in admixed Mediterranean populations; Atlantic fish are fatter, but regions associated with this trait show reduced Atlantic introgression in the Mediterranean.
- The limits
- The authors interpret this pattern as selection against maladapted alleles; the study covers one trait and one hybrid zone.
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