RAD sequencing reveals genomewide divergence between independent invasions of the European green crab (Carcinus maenas) in the Northwest Atlantic

摘要: Genomic studies of invasive species can reveal both pathways and functional differences underpinning patterns colonization success. The European green crab (Carcinus maenas) was initially introduced to eastern North America nearly 200 years ago where it expanded northwards Nova Scotia. A subsequent invasion Scotia from a northern source allowed further range expansion, providing unique opportunity study the genomics with multiple invasions. Here, we use restriction-site-associated DNA sequencing-derived SNPs explore fine-scale genomewide differentiation between these two We identified 9137 loci sampled 11 locations along compared spatial variation mitochondrial COI sequence used previously characterize Overall divergence among invasions high (pairwise FST ~0.001 0.15) spread across many loci, mean ~0.052 52% examined characterized by values >0.05. majority most divergent (i.e., outliers, ~1.2%) displayed latitudinal clines in allele frequency highlighting extensive genomic Discriminant analysis principal components (both neutral outlier loci) clearly resolved spatially highly correlated divergence. Our results cryptic intraspecific diversity associated differing success demonstrates clear utility for approaches delineating distribution aquatic species.