Figure 2 Genetic relationships and population structure of 69 sequenced pipefish based on SNPs. (a) Neighbor-joining tree of the 69 pipefish. The scale bar represents proportional similarity (p distance); (b) Principal component analysis plots based on the first two principal components (PC); (c) Genetic structure and individual ancestry as derived from FRAPPE. The length of each colored segment represents the proportion of the individual’s genome from K = 2–5 ancestral populations.