Education and training Student projects and theses Bachelor's thesis

Bachelor's thesis Biomarkers of cyanobacterial ecotoxicity

Supervisor Supervisor:

Student Student: Hana Paskerová

Status Status: finished

Year Year: 2007

Blue-green algae or cyanobacteria are prokaryotic organisms that are able to form blooms in eutrophicated waterbodies. The blooms cause problems with use of these waterbodies and negatively influence aquatic ecosystem and organisms. The cyanobacterial toxins – cyanotoxins play an important role in these negative effects. Cyanobacteria and their toxins cause subletal changes on biochemical, physiological, histological or morphological levels in aquatic organisms, which can be used as an early-warning signals or biomarkers of their toxicity. Among biomarkers of cyanobacterial ecotoxicity can be included changes of biochemical parameters – parameters of biotransformation, oxidative stress parameters, activities of protein phosphatases and digestive enzymes (mainly trypsine and chymotrypsine). Biomarkers can be also changes of haematological and immunological parameters. Behavioural changes and some changes of physiological and morphological parameters also have informative function about sublethal changes , but they are not commonly considered biomarkers.