Ecophysiological properties of potentially toxic and toxic water cyanobacterial strains from Vojvodina region [Serbia]. [Doctoral dissertation] | Ekofizioloske karakteristike potencijalno toksicnih i toksicnih vodenih sojeva cijanobakterija na podrucju Vojvodine [Srbija]. Doktorska disertacija
2009
Simeunovic, J.
The thesis reviews the occurrences of potentially toxic cyanobacterial blooms and cyanotoxins, microcystins in freshwater ecosystems of Vojvodina region (Serbia). Eutrophication process and the appearance of mass growth of potentially toxic and toxic cyanobacteria were monitored in 18 different freshwater bodies. Almost 60% of the investigated water ecosystems were found in the toxic blooming state and characterized as eu or hyper-trophic waters, based on chlorophyll a concentration. Frequent occurrences of microcystin producers belonging to Aphanizomenon, Microcystis, Anabaena and Planktothrix genera, were detected in most of the examined water ecosystems. During the period summer 2005 - autumn 2007, while conducting the microcystin survey, the toxins were permanently present in all examined ecosystems. The study deminostrates a high prevalence of microcystin-producing cyanobacterial strains in the freshwaters and therefore, regular monitoring is highly desirable in order to minimize health risks associated with the usage of the investigated freshwaters. This thesis also reviews the ecophysiological properties and metabolic activity of 14 potentially toxic cyanobacterial strains isolated from investigated water ecosystems. All investigated cyanobacterial strains had ability to produce microcystins and showed toxic effect to A. salina. Results also shown that all isolated cyanobacterial strains had important biotechnological potential in biomass, protein and phycobilin production. Except this all cyanobacterial strains revealed antibacterial activity in different bacterial bioassays, what is important for their possible biotechnological application.
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