Fig. 4

Growth rates of stickleback differing in phenotype in response to competition. In each panel, the symbols represent stickleback from an experimental intermediate (solitary) population, with more benthic-like individuals on the left and more limnetic-like individuals on the right. Growth rate is measured by ln-transformed fish body length, measured in mm, at the end of the experiment. a Growth rates in the presence (empty circle; dashed lines) and absence (filled circle; solid lines) of the limnetic species. Lines represent best fits to data from two replicates of each treatment. Modified from Schluter (1994). b Growth rates in the presence of the limnetic species (empty circle; dashed line) or the benthic species (filled circle; solid line). Data are from one of three replicate ponds; results were similar in the other two. Modified from Rundle et al. (2003). The phenotype axis is scaled differently in the two panels but is otherwise comparable