The interaction between Cryptomonas ovata (Cryptophyta) and Microcystis aeruginosa (Cyanobacteria) species
Berés, Victória; Bácsi, István; Surányi, Gyula; Vasas, Gábor; Hamvas, Márta Mikóné; Tóth, Szilvia; Máthé, Csaba; Keve, Thilamér Kiss; Borbély, György; Nagy, Alex Sándor; Plenković-Moraj, Andelka; Grizgorszky, István
One of the ways of the species interactions is when individuals of one taxon produce a compound that has an adverse effect on the reproduction, distribution, feeding and life cycles of individuals of the other taxon. In our examinations we described the interaction between Microcystis aeruginosa and Cryptomonas ovata cultures. We worked with C. ovata control cultures, M. aeruginosa control cultures and so-called mixed cultures (these contain C. ovata and M. aeruginosa too). The mixed cultures contained C. ovata and M. aeruginosa cells in the ratio of cell number: 1:50, 1:25, 1:2 and 1:1. We followed the changes of the cell numbers and protein levels of cultures. The results proved that the growth of cell numbers of M. aeruginosa evoked the fall of cell numbers of C. ovata. Not only M. aeruginosa affects C. ovata, but the effects were mutual. In those M. aeruginosa control cultures that contained low initial cell number the cells died, but in the mixed cultures of ratio 1:2 and 1:1 (in which the initial cell number were similar) the cells not only survived, but they grew further. So examining the interaction between these algae, we can say, that the effects of these two species are mutual, because in some cases C. ovata helps to alive the cells of M. aeruginosa.