Population genomics and connectivity of the blue mussel species complex: Insights from a North-east Atlantic hybrid zone

Blue mussels (Mytilus spp.) are ecologically and economically important bivalves widespread in both hemispheres. Their relevance to coastal ecosystems and the aquaculture industry has made them extensively studied. The Mytilus complex consists of distinct genetic lineages, including Mytilus edulis, Mytilus galloprovincialis, Mytilus trossulus, and their fertile hybrids. In overlapping areas, they create complex hybrid zones, which have been investigated along European coasts, employing multi-marker approaches. However, knowledge gaps still exist in the North-east Atlantic region, in the middle of their hybrid zone around the island of Ireland, regarding their genomic composition, population structure, and connectivity. This study addresses these gaps by genotyping 781 individuals from 26 sites encompassing Ireland’s hybrid zone, including both wild and farmed stocks from varying environmental conditions. Using a selected panel of 72 SNP markers, we examined relationships among genotypic..., , # Data from: Population genomics and connectivity of the blue mussel species complex: Insights from a North-east Atlantic hybrid zone

Dataset DOI: [10.5061/dryad.t1g1jwtgj](https://doi.org/10.5061/dryad.t1g1jwtgj)

## Description of the data and file structure

### Files and variables

#### File: Cariolato_et_al_2025_MytilusIrish_PopGenomics.txt

This txt file contains the Genepop .GEN file format is used for the population genomics analyses performed in RStudio.

For each individuals, each column encodes for the genotype of each SNP marker (following the order of the markers listed). 

E.g. individual A1 has 300300 for SNP marker \"108748_B\", therefore homozygous for GG

Finally, each population is separated by \"pop\" line. Populations and individuals codes are reported in the Table 1 of the manuscript.

* List of SNPs markers name
* List of individuals name separated by populations (i.e. \"pop\") and following the code of Table 1
* Genotype data encoded as in .GEN file for Genepop softw...,