The Threespine Stickleback

Variable jackpot individuals provide most alleles for repeated, rapid adaptation to freshwater by anadromous Threespine Stickleback

The Threespine Stickleback has become a key model organism to study evolutionary biology. Experimental introductions of anadromous stickleback into freshwater habitats lacking this species allow analysis of the process of adaptation to freshwater forward-in-time in contrast to retrospective inference using naturally colonized populations. We examined the population genomic dynamics during early stages of adaptation in three replicate lakes that were experimentally founded, each using ~3000...