Marine phytoplankton is highly productive in coastal ecosystems where it generally occurs the major exposure and uptake of contaminants associated with anthropogenic pollution discharges. Phytoplankton presents very high surface-to-volume ratio and may respond rapidly to suspended contaminants showing either bloom events or inhibition effects. The diatom Phaeodactylum tricornutum Bohlin is commonly used in toxicity testing with standardised protocols even if a complete inventory of tested substances and matrices has not been compiled yet. The purpose of this study is setting up a wastewater effect score based on P. tricornutum considering samples originated by domestic, municipal and industrial sources. Results showed the existence of two main effect scenarios with a prevalence of biostimulation rather than toxicity.
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