In addition to 'classical' genetic markers such as microsatellites (which we still find very insightful), the team uses genome-wide sequencing methods (e.g. RAD-seq) for genomic studies looking at:
Links
[1] https://www.sb-roscoff.fr/sites/www.sb-roscoff.fr/files/styles/original_image/public/images/station-biologique-roscoff-migration-collective-structure-genetique-1991.jpg?itok=6l0mJTYD