The study analyzed the population genomics of the Anopheles darlingi mosquito, the main malaria vector in South America, by sequencing the genomes of 258 individuals originating from 23 locations in eight countries. The researchers identified high genetic diversity in populations from the Amazon, where three main genetic clusters corresponding to geographic regions occur: northern, central, and southern. Populations show signs of recent expansion, with effective population size increasing from approximately 10,000 to 100,000 individuals over the past 10,000 years. Local adaptations have been detected, including genes associated with resistance to insecticides such as pyrethroids in areas of high pesticide pressure. The study revealed gene flows between populations, with migration rates estimated at 1–5 individuals per generation between neighboring regions. These findings provide the basis for targeted vector control strategies, such as the release of genetically modified mosquitoes.