Long-Term Dynamics of Adaptation in Asexual Populations

See allHide authors and affiliations

Science  14 Nov 2013:
DOI: 10.1126/science.1243357

You are currently viewing the abstract.

View Full Text


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.

View Full Text