| Summary: | Mathematical expressions were derived describing the distribution and concentration of individual phytoplankton pigments with respect to biotic factors in the southern Baltic. Relationships wereestablished between the chlorophyll <i>a</i> concentration and the total phytoplankton biomass (represented by the organic carbon content), as well as between the concentration of marker pigmentsand the biomasses of the corresponding phytoplankton classes.Knowledge of chlorophyll <i>a</i> concentrations allows the phytoplankton biomass to be estimated with a precision characterised by relative statistical errors according to logarithmic statistics of σ_= ca 56%. The best approximation was obtained for the dependence of the <i>Bacillariophyceae</i> biomass on the fucoxanthin concentration (σ_= 60%), <i>Chlorophyceae</i> on the lutein concentration (σ_=48%), and the total biomass of <i>Dinophyceae</i>, <i>Bacillariophyceae</i>and <i>Euglenophyceae</i> on the concentration of diadinoxanthin, the main carotenoid pigment present in cells of species from these classes (σ_=60%).
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