Extensive Sampling and Concomitant Use of Meristic Characteristics and Variation at the MDH-A* Locus Reveal New Information on Redfish Species Distribution and Spatial Pattern of Introgressive Hybridization in the Northwest Atlantic

摘要: Variability at the MDH-A* locus, of anal fin ray number and extrinsic gasbladder muscle pattern is used to describe distribution Sebastes fasciatus S. mentella in Northwest Atlantic define geographical boundaries area introgressive hybridization between two species. extends from Gulf St. Lawrence northward while distributed southern Grand Banks southward as described earlier studies. also found Labrador Sea where species appears reach its northernmost limit. The overlaps mainly Laurentian Channel, around on Flemish Cap. This sympatry comprises a smaller heterozygous individuals locus are observed occurs. mostly restricted Channel. west-east gradient abundance introgressed suggests that centre larval dispersion or migration juveniles adults takes place towards south Newfoundland Banks. In contrast, absence outside Channel indicates these limited for all stages life cycle.