Figure 2

From: A steep cline in ladybird melanism has decayed over 25 years: a genetic response to climate change?

Figure 2

Pattern of change in melanic frequency over time along the study transect. (a) Plotted in red: the maximum difference in percentage melanics between any two samples collected at each locality over the study period; and in yellow: the comparable difference for the earliest and latest samples obtained for each locality. A negative sign indicates a decline in melanism over time, and a star indicates a significant change in frequency. (b) The difference in each sampling year between the median value for percentage melanics for the five most westerly localities near the coast and that for the five most easterly localities inland showing the approach to homogenization over the whole transect.