Fig. 3 in Dinophyta Characterise Nitrogen Scarcity More Strongly than Cyanobacteria in Moderately Deep Lakes

Fig. 3. PCA of lakes ordinated in relation to mean growth season composition of phytoplankton, expressed as proportion of biovolume. a – phytoplankton divisions; b – phytoplankton species, eigenvalues are the same as in Fig. 2. Symbols shaded to show N:P ratio or to denote where available N or P fell below laboratory detection limits in the growth seasons samples collected (key to symbols in Table 4).