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# Long description

This figure comprises three scatter graphs showing the distance from the Mediterranean coast plotted against frequency of the ester1 allele in mosquito populations in the south of France for three dates in the 1970s. In each case the vertical axis is labelled frequency of the ester1 allele and is marked from zero to 1.0 with intervals every 0.20. The horizontal axis is labelled distance from the coast/km and is marked from zero to 50 with intervals every 10 km. A curve is drawn through the numerous data points.

The graph on the left shows the data taken in 1973. At the coast, the frequency of the ester1 allele is just above 0.6 which steadily declines to zero by 20 km from the coast (cluster of data points is tightly focused in the range 0.5−0.02, 5−15 km respectively).

The graph in the middle shows the data taken in 1975. At the coast, the frequency of theester1allele is 1.0 which initially declines rapidly and then more steadily to 0.1 by ~35 km from the coast (cluster of data points is more scattered in the range ~1.0−0.0, 5−35 km, respectively).

The graph on the right shows the data taken in 1978. At the coast, the frequency of the ester1allele is 0.95 which initially declines rapidly and then more steadily to 0.2 by ~35 km from the coast (cluster of data points is much more scattered range ~1.0−0.2, 5−35 km, respectively).