Speaker: Luca Peliti Title: Fluctuation Relations and Fitness in Population Dynamics Abstract: Recent advances in single-cell lapse microscopy allow to monitor the division dynamics and the phenotypic state in growing cell populations. The resulting data allow to infer the fitness of a phenotype in constant and varying environments, by exploiting fluctuation relations similar to those of stochastic thermodynamics. I shall summarize these techniques, highlighting their strong points and possible pitfalls.