FIG. 1.

Properties of Planktothrix sp. strains that were used in this study. Shown for each strain are its chemotype affiliation, its identification number in the NIVA culture collection, when and from which water body it was isolated, if it contained the pigment phycoerythrin, and its cellular oligopeptide composition. For each oligopeptide, the name and its molecular mass (in daltons, in parentheses) are given. The oligopeptides are sorted by structural class. Mcyst, microcystin. Strains with phycoerythrin correspond to P. rubescens, and those without the pigment correspond to P. agardhii. Lakes Långsjön and Vesijärvi are situated in Finland. All other lakes are situated in southeastern Norway. All data are taken from Rohrlack and coworkers (36).