Fig. 1
From: Population structure, demographic history and local adaptation of the grass carp
Principal component analyses for (a) all nine locations and (b) six native locations of grass carp based on all genotyped SNPs, where PC1 and PC2 contain all the meaningful signals. The native locations are annotated with the river systems where they were collected (Y, H and P corresponding to the Yangtze, Heilongjiang and Pearl River Systems, respectively), while the introduced locations are indicated with I