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International Journal on Algae

ISSN Print: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v8.i4.70
pages 378-394

The fine structure of frustula in the species of the genus Aulacoseira Thw. (Bacillariophyta) from the Ob' River

M. V. Usoltseva
Lymnological Institute, Siberian Branch of RAS, 3, Ulan-Batorskaya St., 664033 Irkutsk, Russia
E. V. Likhoshvay
Lymnological Institute, Siberian Branch of RAS, 3, Ulan-Batorskaya St., 664033 Irkutsk, Russia

ABSTRACT

Morphological parameters and fine structures studied of the species Aulacoseira granulate (Ehr.) Sim., A. ambigua (Grun.) Sim., A. subarctica (O. Müll.) Haworth and A. islandica (O. Müll.) Sim. from the summer phytoplankton of the Ob' River have been studied. Curved form was recorded only for the species A. ambigua, which did not differ from the typical one by its fine structure. The species A. islandica in the Ob' River differs from the representatives of water bodies of Northern America, Europe, and Lake Baikal by number, position, and shape of rimoportulae. A. islandica is similar with the Far East population and A. pseudoislandica from Kamchatka Pleistocene deposits.