Fig. 2: Phenotypic and genomic differentiation across the lake-stream transition. | Nature Communications

Fig. 2: Phenotypic and genomic differentiation across the lake-stream transition.

From: Clinal genomic analysis reveals strong reproductive isolation across a steep habitat transition in stickleback fish

Fig. 2

a Morphology, including geometric morphometric body shape (principal component scores, details in Supplementary Fig. 1), a predator defense trait (pelvic spine length), and a foraging trait (gill raker number). For ease of presentation, only site means are shown. Data were available for a subset of the study sites only. b Frequency of the stream allele at the 50 independent SNPs exhibiting strong differentiation (AFD ≥ 0.97) between the most distant sites L1 and S7 (i.e. the selected SNPs, blue lines; their median frequency is shown in orange), and at 500 neutral SNPs (gray lines; median frequency in black). Source data are provided as a Source Data file. c Chromosome center-biased differentiation (CCBD), calculated for all pairs of neighboring samples. The midpoint between the paired samples is used as location along the gradient. In all panels, the dotted vertical lines indicate the lake-marsh and marsh-stream habitat boundaries and the black vertical line indicates the cline center estimated for the selected and neutral SNPs (1071 m). The distances on the X-axis represent the approximate swimming distance between each site and the lake site L1.

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