effect of dispersal on the temporal trend of the CV across the eight lake sites. The upper panel shows the percent abundance of the species at each of the eight lake sites over time under one simulation run of ecological drift with fat-tailed dispersal. The lower panel shows the CV of the species' abundance across the eight lake sites over time from single simulation runs of ecological drift with fat-tailed dispersal, Gaussian dispersal and for the case where the eight lake sites are taken to be independent local communities, as in Clark and MacLachlan (2003). Time is measured in the number of turnovers of the community that have occurred. Results shown are for the age cut-off set to 10 years.