Increased mitochondrial DNA diversity in ancient Columbia River basin Chinook salmon Oncorhynchus tshawytscha
Fig 2
Haplotype networks of ancient and contemporary groups, including Columbia sub-groups.
Orientation for haplotypes is constant between networks, circle size is proportional to frequency in the grouping, lines represent mutational connections. Four “evolutionary backbone” types as defined by Martin et al. [42]are labeled for reference in the network.