Climate effects on growth, body condition and survival depend on the genetic characteristics of the population

Climatic change is expected to affect individual life-histories and population dynamics, potentially increasing vulnerability to extinction. The importance of genetic diversity has been highlighted for adaptation and population persistence. However, whether responses of life-history traits to a given environmental condition depend on the genetic characteristics of a population remains elusive. Here we tested this hypothesis in the lizard Zootoca vivipara, by simultaneously manipulating habitat humidity, a major climatic predictor of Zootoca's distribution, and adult male colour morph frequency, a trait with genome-wide linkage. Interactive effects of humidity and morph frequency had immediate effects on growth and body condition of juveniles and yearlings, and on adult survival, and delayed effects on offspring size. In yearlings, higher humidity led to larger female body size, and lower humidity led to higher male compared to female survival. In juveniles and yearlings, some treatment ...