Figure 2.

Levels of oxidative damage to DNA in Tigriopus californicus inbred lines. Shown are means ± s.e.m. picograms of 8-OH-dG, normalized to DNA concentrations, for each category of inbred line. For genetic divergence, reciprocal crosses between SD × BR are considered ‘low’, whereas crosses between (SD or BR) × (AB, SC or BB) are considered ‘high’. Fecundity levels were assigned based on the mean fecundity of each hybrid line compared with the parental-level threshold, as described in figure 1. In other words, hybrid lines showing breakdown were pooled as ‘low’, and those with parental-level fecundity were pooled as ‘high’.