Russian Journal of Marine Biology

, Volume 44, Issue 1, pp 14–24 | Cite as

The Morphological, Genetic and Physiological Characteristics of a Benthic Dinoflagellate of the Genus Ostreopsis Isolated from Coastal Waters of the Northwestern Sea of Japan

  • M. S. Selina
  • T. V. Morozova
  • N. A. Aizdaicher
  • K. V. Efimova


A previous molecular-genetic analysis of clonal cultures and single cells of Ostreopsis spp. that were isolated from Peter the Great Bay (the Sea of Japan) revealed three different genotypes according to the nucleotide sequences of ribosomal DNA (rDNA). Of these, Ostreopsis sp. 1 was earlier found only off the coast of Japan and described as being the most common and highly toxic. We have obtained further molecular evidence and have studied the morphological features of cells from one of the Ostreopsis strains with this genotype and some aspects of its growth at salinities of 24, 28, and 32‰. The results showed that in cells from the Russian coast of the Sea of Japan, the third apical (3') and the third precingular (3") plates do not adjoin one another, being separated by the elongated second apical (2') plate. Cells of Ostreopsis sp. 1 from the Russian coast are significantly larger than Ostreopsis sp. 1 cells with the same genotype from the coast of Japan. Salinity did not have a substantial effect on the growth of Ostreopsis sp. 1. The growth rate varied from 0.24 to 0.35 divisions per day, with maximum values at a salinity of 24‰. When salinity decreased to 24‰, the exponential growth phase was significantly extended and the maximum cell concentration doubled.


Ostreopsis morphology morphometry growth rate salinity Sea of Japan 


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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • M. S. Selina
    • 1
  • T. V. Morozova
    • 1
  • N. A. Aizdaicher
    • 1
  • K. V. Efimova
    • 1
    • 2
  1. 1.Zhirmunsky Institute of Marine Biology, National Scientific Center of Marine Biology, Far Eastern BranchRussian Academy of SciencesVladivostokRussia
  2. 2.Far Eastern Federal UniversityVladivostokRussia

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