biostudies-literatureUnknown25(1)Laruson AJThe northern shrimp Pandalus borealis (ice. Stóri kampalampi) is a North Atlantic crustacean of significant commercial interest which has been harvested consistently in Icelandic waters since 1936. In Icelandic waters, the length at which this protandrous species transitions from male to female differs between the inshore and offshore populations, suggesting a biologically meaningful stratification which may or may not be plastic. Using reduced representative genomes assembled from RADseq data, sampled from 96 individuals collected at two time points (2018 and 2021), we compare the level of genetic structure across a gradient extending out of Skjálfandi bay, north Iceland. These data are compared to samples from a far offshore site, some 65 km out from the bay, as well as another inshore fBMC ecology and evolution31https://www.ebi.ac.uk/biostudies/studies/S-EPMC11987239biostudies-literaturePopulation stratification in Northern shrimp (Pandalus borealis) off Iceland evident from RADseq analysis.PMC11987239Goodall JGunnarsdottir HPalsson SJonsdottir IGLaruson AJfalsePopulation stratification in Northern shrimp (Pandalus borealis) off Iceland evident from RADseq analysis.The northern shrimp Pandalus borealis (ice. Stóri kampalampi) is a North Atlantic crustacean of significant commercial interest which has been harvested consistently in Icelandic waters since 1936. In Icelandic waters, the length at which this protandrous species transitions from male to female differs between the inshore and offshore populations, suggesting a biologically meaningful stratification which may or may not be plastic. Using reduced representative genomes assembled from RADseq data, sampled from 96 individuals collected at two time points (2018 and 2021), we compare the level of genetic structure across a gradient extending out of Skjálfandi bay, north Iceland. These data are compared to samples from a far offshore site, some 65 km out from the bay, as well as another inshore f2025-01-01T00:00:00Z2025 Apr2025-07-09T03:04:55.297Z2025-07-09T03:04:55.297ZS-EPMC119872394021113710.1186/s12862-025-02369-9