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MICROBIOLOGICAL INDICATORS IN CONTAMINATED RIVERSECTOR ASSOCIATED WITH BIOREMEDIATION POTENTIAL OFSYSTEMY. Todorova, Y. TopalovaSofia University, Faculty of Biology, 8 Dragan Tzankov, 1164 Sofia, Bulgaria;yovana.todorova@gmail.comThe middle part of Iskar River continues to be one of the critical environmentalpoints in Bulgaria with a high risk level for the environment and humans. In theriver ecosystem, the effects of complex pollution with organics, heavy metals,petroleum products and other difficult-biodegradable compounds have beenobserved from decades. But this part of the river, however, is the subject ofintensive hydrotechnical engineering in recent years /construction of a cascade of 9mini-hydroelectric power stations/ and this strongly poses the question ofecological state improvement and achievement of high energy efficiency. Theanalysis of natural microbial communities in river ecosystem is one of themechanisms for assessing self-purification capacity and implementation ofdifferent bioremediation techniques for reduction of damages caused by the oldcontaminations. Spatial and seasonal variations in water and sediment microbialindicators were identified in 5 sampling sites in river and in 2 sampling sites inmicro-reservoirs at the first two functioning hydro-electric powers. The verifiedmicrobial indicators were used to evaluate the water and sediment quality. Thetotal count of heterotrophic bacteria is a process indicator for efficacy of aheterotrophic biodegradation and biotransformation of organic pollutants. Thecoliforms count is an indicator for the faecal contamination. The obtained resultsshows the great variety and abundance of the microbial communities in the middlepart of Iskar River and this approves a high self-purification potential of the riverecosystem and the effective future use of bioremediation techniques to eliminatethe sediment contaminants.14:15-14:30ФУНКЦИОНАЛНОТО БИОРАЗНООБРАЗИЕ – ПОДХОД ЗА ОЦЕНКАНА РЕАКЦИЯТА НА ФИТОПЛАНКТОННИТЕ СЪОБЩЕСТВА КЪМЕУТРОФИКАЦИОННИ ГРАДИЕНТИС. Мончева, Н. СлабаковаИнститут по океанология, БАН, ул. Първи Май, 40, Варна 9000;E-mail: snejanam@abv.bg; n.slabakova@abv.bgИдентифицирането на закономерности в биологичните съобщества е отсъществено значение за изучаването на комплексността на екосистемите –тяхната структура и функция. Таксономично и не-таксономично базираниподходи намират приложение за категоризиране изменчивостта наорганизмите и извеждане на обобщени макроекологични зависимости.27