Variation in chronic radiation exposure does not drive life history divergence among populations across the Chernobyl Exclusion Zone.

Ionizing radiation is a mutagen with known negative impacts on individual fitness. However, much less is known about how these individual fitness effects translate into population-level variation in natural environments that have experienced varying levels of radiation exposure. In this study, we sampled genotypes of the freshwater crustacean, , from the eight inhabited lakes across the Chernobyl Exclusion Zone (CEZ).