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The benthic diatom Gomphonema parvulum Kutzing is a common species in both clean and metal contaminated rivers. Our aim was to investigate whether metal-induced tolerance could explain the persistance of this taxon under metal polluted conditions. G. parvulum strains were isolated from a Zn- and Cd-contaminated stream and from a relatively clean (''reference'') stream. The strains were cultured in...