Fig. 3: Whole-genome sequencing reveals genetic heterogeneity among large Baltic herring.
From: Evolution of fast-growing piscivorous herring in the young Baltic Sea
Comparison of Slåttersill and six other population samples of exceptionally large Baltic herring relative to previously sequenced Atlantic and Baltic herring samples14. a PCA plot of WGS data filtered to 407 (out of 794) markers previously used to define primary population groups in Atlantic herring14. The seven primary population groups are represented as labeled gray ellipses, while the individual points represent pooled per-location averages. The color of individual points represents the group each represents, i.e., Slåttersill (blue), large Baltic herring (other than Slåttersill, purple), spring-spawning herring (red), and autumn-spawning herring (black). b Delta allele frequency contrast of chromosome 20, between all large Baltic herring (including Slåttersill) and small, spring-spawning Baltic herring. c Neighbor-joining tree based on allele frequency differences for the chr20 region of interest (12.8–16.7 Mb) for all large Baltic herring, small spring- and autumn-spawning Baltic herring, and populations from the Transition Zone (Baltic side, Tr/B; Atlantic side, Tr/A) and Irish and British (I/Br) waters. d Zoom-in heatmap of the chr20 region of interest (12.8–16.7 Mb) highlighted in the gray box in Fig. 3b using the same population samples as in Fig. 3c (delta allele frequency cutoff >0.25). e Neighbor-joining tree based on allele frequency differences for the chr12 inversion region (17.8–25.6 Mb) using the same population samples as in Fig. 3c. f Zoom-in heatmap of the chr12 inversion region (17.8–25.6 Mb) using the same population samples as in Fig. 3c (delta allele frequency cutoff >0.35). Population samples of large herring are labeled as follows: Slåttersill (1); Blekinge (9); Finland (10); Gävlebukten (11); Kalmar (12); Östergötland (13); Stockholm (14) (see Supplementary Table 6). Samples sourced from outside of the Baltic Sea are labeled using letters, where: Transition Zone (Baltic side, Tr/B), Transition Zone (Atlantic side, Tr/A), Ireland/Britain (I/Br). Source data are provided as a Source Data file.
