The utilization of algal primary production by consumers in upper trophic levels

The study presents the results of investigations regarding the use of the microalgae species Chlorella vulgaris Beijerinck 1890 and Oscillatoria amphibia C. Agardh ex Gomont 1892 as a food source for the population of Paramecium caudatum Ehrenberg, 1834. The results demonstrate how different concentrations of algae cultures influence the cellular reproduction parameters in Paramecium caudatum. Low concentrations of Chlorella vulgaris stimulate growth, while high concentrations of Oscillatoria amphibia have a negative effect on the paramecia population. Chlorella vulgaris can be effective in small doses to stimulate growth and short-term productivity, while Oscillatoria amphibia, in high concentrations, can negatively impact reproduction and cell division. The importance of these findings lies in understanding the use of algae as a food source for ciliates, with implications for the ecological status of aquatic ecosystems and the health of protozoan populations.