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Investigations were performed on the flora, community composition and ecology of the diatoms collected from the water system in the suburbs of Kyungju city from June, 1981 to May, 1982 and from August to September, 1983. Total taxa of 157 were identified as diatoms consisting of 2 orders, 5 suborders, 8 families, 12 subfamilies, 26 genera, 97 species, 54 varieties and 6 forma. Among them 69 taxa were found as unreported ones in Korea. By the criteria of adaptability of these taxa to organic pollution in water, the taxa could be classified as 8 of tolerant, 34 of indifferent and 115 of intolerant taxa.
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