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Zooplankton plays a significant role within the Black Sea ecosystem, contributing to the top ? down regulation of trophic web, by intermediating vital ecological processes such as the nutrients recycling (e.g., by controlling phytoplankton and bacterial aggregates development) within the pelagic and benthic habitats. It is considered an important indicator of ecosystem health, being a quality assessment element within the Water Framework Directive (2000/60/EC). Based on the 55 samples collected in the Romanian wat...