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Fig. 1 | BMC Biology

Fig. 1

From: Population genomics of an icefish reveals mechanisms of glacier-driven adaptive radiation in Antarctic notothenioids

Fig. 1

The environmental parameters of sampling sites and the C. hamatus population structure in the East Antarctic Continental Shelf. A The sampling sites (denoted by color-filled circles or semicircles for close sites) for C. hamatus and the CTD cast sites (yellow triangles) along the East Coast of Antarctica. B Principal components analysis (PCA) on SNPs from 52 C. hamatus individuals. RS1 (red) and another 3 populations are split by the first eigenvector (variance explained at 7.3%). RS2 (blue), ZD1 (green) and ZD2 (purple) are split by the second eigenvector (variance explained at 4.2%). C Maximum likelihood tree based on SNPs from the 52 individuals. The branches of each population were shown by distinct color as in B. The tree is positioned on top of the Antarctic map to show the two geographic locations: Ross Sea and Prydz Bay from where the majority of the samples were collected (detailed phylogenetic relationship in Additional file 1: Fig. S5). D,E The temperature-oxygen-depth curves for two Ross Sea (D) and two Prydz Bay (E) sites. Solid and dashed lines were used to distinguish two different sites of the same geographic area where CTD measurements were conducted. Blue (lower x-axis) and gray (upper x-axis) were used to denote temperature and oxygen, respectively. The data was generated by the 36th Antarctic Exploration Team of China during January 3–6 and December 4–6, 2019, using the SBE 911 plus instrument (Sea-bird Scientific, USA)

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