Data from: Long-term dynamics of adaptation in asexual populations

Experimental studies of evolution have increased greatly in recent years,
stimulated by the growing power of genomic tools. However, organismal
fitness remains the ultimate metric for interpreting these experiments,
and the dynamics of fitness remain poorly understood over long timescales.
Here, we examine fitness trajectories for 12 Escherichia coli populations
during 50,000 generations. Mean fitness appears to increase without bound,
consistent with a power law. We also derive this power-law relation
theoretically by incorporating clonal interference and diminishing-returns
epistasis into a dynamical model of changes in mean fitness over time.