Year: 2019, Number: 3, Pages: 5-13
Species composition and density of the diatom belonging to the genus Pseudo-nitzschia found in summer plankton of Far Eastern Marine Biosphere Reserve were studied. Six species including 5 potentially toxic species were found. P. delicatissima and P. hasleana were new records for the study area. Density of Pseudo-nitzschia spp. varied from 0.8 to 5.6 103 cells·l-1. P. calliantha, P. delicatissima, P. hasleana, P. pungens were the most numerous species (more than 2·103·l-1). Domoic acid (0.013 pg · cell-1) was found in 42-day culture of P. delicatissima. The relatively low concentrations of potentially toxic diatoms revealed that there is no danger of domoic acid poisoning in Far Eastern Marine Biosphere Reserve in summer.