The peculiarities of development of the three species of benthic diatoms of the genus Attheya West: A. arenicola N.L. Gardner et R.M. Crawford, A. ussurensis Stonik, Orlova et R.M. Crawford and A. longicornis R.M. Crawford et N.L. Gardner in laboratory cultures isolated from the Sea of Japan were experimentally studied at water salinity decline conditions. It was revealed that growth rate of cultured cells decreased and morphological changes in the cells were observed at water salinity lower than 12 ‰. The most considerable changes in growth rate of cultured cells and in their morphology at low water salinities were found for A. arenicola.

Keywords: benthic diatoms, genus Attheya, salinity

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