{"refrec":{"BRefID":19558,"RR":"<b>Burkert, U.; Hyenstrand, P.; Drakare, S.; Blomqvist, P.</b> (2001). Effects of the mixotrophic flagellate <i>Ochromonas</i> sp. on colony formation in <i>Microcystis aeruginosa</i>. <i>Aquat. Ecol. 35(1)</i>: 9-17","BEntID":19558,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Ecol. 35(1)</i>: 9-17","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Burkert, U.; Hyenstrand, P.; Drakare, S.; Blomqvist, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Burkert, U. <i>et al.</i>","Englishabstract":"The aim of this study was to investigate the interactions between the cyanobacteria (<i>Microcystis aeruginosa</i>) and the potential grazer (<i>Ochromonas</i> sp.) with regard to colony formation. Two kinds of treatments were carried out: (i) In the dialyse experiment <i>Microcystis aeruginosa</i> and <i>Ochromonas</i> sp. were physically separated by a dialyse tubing. (ii) In the contact experiment interactions between <i>Microcystis aeruginosa</i>, heterotrophic bacteria and <i>Ochromonas</i> sp. in different concentrations were investigated. In one treatment where the predator <i>Ochromonas</i> sp. came in direct contact with <i>Microcystis</i>, aggregates were formed. In the contact experiment, there were some interactions between the predator <i>Ochromonas</i> sp. and the two groups of prey, <i>Microcystis aeruginosa</i> and heterotrophic bacteria. When exposed to a low initial <i>Ochromonas</i> sp. concentration, <i>Microcystis aeruginosa</i> decreased and then remained stable in concentration. <i>Ochromonas</i> sp. switched to feed on heterotrophic bacteria and increased. 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