Fig. 3.

Proportions (%) of (a) mcyB, (b) aerB, and (c) apnC within three different population density categories of red- or green-pigmented Planktothrix spp.: dense,>1.0 mm³ L⁻¹; moderately dense, 0.1–1.0 mm³ L⁻¹; sparse,<0.1 mm³ L⁻¹. The whiskers of each box indicate the 10th and 90th percentiles. If an overall difference between lake groups within a pigmentation type was found, superscripts (a, b) indicate homogeneous subgroups not significantly different at P<0.05.