Figure 2From: Stability of toxin gene proportion in red-pigmented populations of the cyanobacterium Planktothrix during 29 years of re-oligotrophication of Lake ZürichAbundance of the total Planktothrix population and the toxic genotype. Mean ± SE biovolume of Planktothrix determined in Lake Zürich from 1977 to 2008 using 16S rDNA and the mcyB gene by means of qPCR and microscopic counting. Biovolume in mm3 L-1.Back to article page