Figure 3. A in Hybridization of beaked redfish (Sebastes mentella) with small redfish (Sebastes viviparus) and diversification of redfish (Actinopterygii: Scorpaeniformes) in the Irminger Sea

Figure 3. A median joining network of Sebastes mitochondrial DNA haplotypes, calculated and drawn on the basis of nucleotide variations in the control region with lengths from 365 to 368 base pairs for different redfish species. V1–V3, haplotypes of Sebastes viviparus (black circles); F1, F2, haplotypes of Sebastes fasciatus (grey circles); MR1–MR6, haplotypes of Sebastes marinus (white circles). Haplotypes of Sebastes mentella are shown as hatched circles: haplotypes M-A1–M-A6, horizontally hatched circles; haplotypes M-B1–M-B4, vertically hatched circles; haplotype M-AB, cross-hatched circles. Abbreviations M-Hb1 and M-Hb2 denote haplotypes of fish heterozygous for MDH-2∗67/100. The area of circles is proportional to the number of carriers of relevant haplotypes. Length of connecting lines is proportional to the number of nucleotide polymorphisms (insertion-deletions and/or replacements) separating the haplotypes. Numbers next to the lines show nucleotide positions for the longest D-loop sequences of Sebastes (509-base-pair length; M-B haplotype group), which contain the relevant polymorphic sites that separate the haplotypes. Ovals denote groups of haplotypes belonging to fish of the same species. The position of M-Hb1 and M-Hb2 haplotypes in the group of haplotypes that belong to S. mentella suggests that it is the maternal species for hybrids.