Genome-Scale Phylogenetic and Population Genetic Studies Provide Insight Into Introgression and Adaptive Evolution of Species in East Asia.

As a typical marine adaptive radiation species, most species are widely distributed in East Asian offshore, which have diversified morphological characteristics and different ecological habits. The phylogenetic relationship and population structure of the species was complicated because of incomplete lineage sorting, widespread hybridization and introgression. Therefore, to systematically clarify the phylogenetic relationships of genus, explore the introgression and natural hybridization between different species, and detect the selective signatures in the adaptive evolution of diversified traits, whole-genome resequencing was used in 122 samples from 10 species. Phylogenetic analysis showed solid sister-group relationships between and , , and , , and , , and . Further admixture analysis indicated the divergence of population and the bidirectional gene flow between and . Using species-specific homozygous genetic variance sites, we detected the asymmetric introgression between and at China East sea and southern Taiwan Strait. By genome-scale genetic diversity scanning, we detected two copies of , and related to the semilunar reproduction rhythm in , involved in memory formation, embryo maturation and female reproduction. Furthermore, we also found lots of specific mutations in CDS region of circadian rhythm related genes and endocrine hormone genes. For species, our research provides reliable genetic resources and results for the phylogeny, introgression, hybridization and adaptive evolution, and could be used as a guide for the formulation of the protection and proliferation release policies.