The quantitative and qualitative composition of live dinoflagellate cysts was studied in the upper two-centimeter layer of recent marine sediments that were collected at 19 stations in the coastal waters of the western Bering Sea. A total of 28 types of identified cysts belonged to the following 11 genera: Alexandrium, Diplopsalis, Ensiculifera, Gonyaulax, Gyrodinium, Pentapharsodinium, Polykrikos, Preperidinium, Protocera- tium, Protoperidinium, and Scrippsiella. The morphology of dinoflagellate cysts from recent sediments of Russian seas, such as the shape, the size, and also the structure of the phragma, including the processes and the archeopyle, was described comprehensively for the first time. Cysts of the species Gonyaulax spinifera, Pentapharsodinium dalei, Protoceratium reticulatum, Protoperidinium americanum, P. conicoides, P. subinerme, Scrippsiella crystallina, and S. trochoidea were the most widespread. Those of the potentially toxic species Alexandrium tamarense were also widely distributed and prevailed in the studied area. Their concentration varied from 0 to 25 860 cells/cm3; the maximum concentration was recorded in Pavel Bay, Koryak Okrug, and Kamchatka.
Russian Journal of Marine Biology – Springer Journals
Published: Mar 25, 2013
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