Abstract Long-term (2004–2020) studies showed yearly summer/autumn blooms in the NE Black Sea dominated by large (cell volume > 5000 ?m3) diatoms (Pseudosolenia calcar-avis and Proboscia alata). This phenomenon is characterized high (>250 W m?2 photosynthetically active radiation, PAR) insolation, low phosphorus concentrations (to analytical zero). These contained >100 chlo...
