Abstract
Concentrations of pelagic fungal biomass, determined as the content of ergosterol in particulate matter, were measured in 49 Baltic rivers during summer 1999. The ergosterol concentration varied 12-fold, from 12.6 to 152.5 ng l−1 (average of 56.4 ng l−1) and correlated positively with concentrations of dissolved organic matter and inorganic nutrients as well as with spectral DOM properties indicative of terrestrial sources. The fungal biomass was 12- to 100-fold lower than the biomass of pelagic bacteria, suggesting that fungi in the water column of the rivers probably were of minor importance in the riverine ecosystems at the sampling time.
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