Abstract
Effects of environmental factors, including acidity, temperature, oxygen, nitrogen, phosphate and total iron content, on the diversity of aquatic mycobiota in lake water were studied in two lakes in Northern Poland in 2005–2007. Fifty four species of fungi and fungus-like organisms were recorded in the sub-surface and benthic of both lakes. There were 36 and 45 species in Lakes Marta and Sitno, respectively. The greatest species diversity was observed with a higher content of oxygen and biogenic compounds in the surface water. Temperature and oxygen content were the most important factors affecting the distribution of mycobiota in lake water.