Evolutionary origins of genomic adaptations in an invasive copepod.

摘要: The ability of populations to expand their geographical ranges, whether as invaders, agricultural strains or climate migrants, is currently one the most serious global problems. However, fundamental mechanisms remain poorly understood regarding factors that enable certain populations, such biological rapidly transition novel habitats. According hypothesis, environmental fluctuations in native range could promote successful invasions by imposing balancing selection on key traits and maintaining genetic variation enables rapid adaptation Here we test genomic predictions this hypothesis performing whole-genome sequencing multiple independent invasive freshwater saline copepod Eurytemora affinis complex. We found have repeatedly responded through parallel use same single-nucleotide polymorphisms loci, a much greater degree than expected. These loci were enriched for signatures long-term with 15-47% exhibiting significant selection. strong association between evolution invaded supports fluctuating habitats can success might serve widespread important mechanism nature.