Depth-associated genetic structure within redfish (Sebastes mentella) across the North Atlantic: one broad region, two depth strata, two incipient species? ...

• Main Authors: Valentin, Alexandra E., Stransky, Christoph, Power, Don, Sévigny, Jean-Marie
• Format: Conference Object
• Language: unknown
• Published: ASC 2015 - Theme session I 2024
• Subjects: Technologies and data; Pressures, impacts, conservation, and management; Greenland; Irminger Sea; North Atlantic; Sebastes mentella
• Online Access: https://dx.doi.org/10.17895/ices.pub.25682415; https://ices-library.figshare.com/articles/conference_contribution/Depth-associated_genetic_structure_within_redfish_Sebastes_mentella_across_the_North_Atlantic_one_broad_region_two_depth_strata_two_incipient_species_/25682415

No abstracts are to be cited without prior reference to the author.Genetic and shape analyses of archived otoliths were used for investigating redfish (Sebastes mentella) population structure at depths above and below 500 m, at the scale of the North Atlantic (i.e., Canadian waters, West Greenland shelf, and Irminger Sea). DNA was extracted from 853 archived otoliths sampled in 2009-2011 and was genotyped at 13 microsatellite loci. An individual-based clustering method detected two genetic groups; both groups were observed within each region. Overall, these groups segregated by depth, but (i) juveniles from the genetic 'deep group' were usually found at depth shallower than 500m, in regions close to the continental shelf/slope and (ii) large adult specimens from the genetic 'shallow group' strongly dominated all sampling depths in the southwest Irminger Sea and Flemish Cap. No consistent spatial structure was observed within each group, but introgression with Sebastes fasciatus was observed on the Flemish ...