Fig. 3. Critical thermal maxima (CTMax; A) and minima (CTMin; B) for three northern [Nova Scotia (NS), Maine (ME) and New Hampshire (NH); hatched] and three southern [Georgia (GA), Fernandina Beach, FL (FB) and Whitney Island, FL (WI); grey] populations of killifish acclimated to 22°C and 12 h:12 h L:D photoperiod. Values are mean ± s.d., N=15; significant differences between populations within each panel are indicated by different letters (P<0.001 for all significant comparisons).