Additional data to the Bastak Reserve diatom algae flora (Bacillariophyta)

The article provides new information concerning the composition of diatoms at the Bastak State Nature Reserve. Previously, in the published collective monograph materials, the diatom (Bacillariophyta) section contained 204 species (together with varieties and forms) were identified. The search was conducted in Lake Zabelovskoye, the rivers of Zabelovkaya, Losiny Klyuch, Glinyanka, Bastak, Maly Sorennak, two of the Amur channels (Krestovaya and Chertovaya), unnamed lake in the valley of the Losiny Klyuch river, and a swampy reservoir at the Glinyanka river mouth. The author provides an annotated list of detected taxa, indicating the location, collection time, and frequency of occurrence. The genera Gomphonema, which includes 13 species, and that of Pinnularia,10 species, are characterized by the greatest species diversity. We have discovered a number of interesting and rare alga species, characterized by unique ecological features and limited distribution. They are: Eunotia circumborealis Lange-Bertalot et Nörpel, E. zygodon Ehrenberg, Caloneis pulchra Messikommer, Cavinula pusio (Cleve) Lange-Bertalot, Gomphonema elongatum W. Smith, Gomphosphenia grovei var. lingulata (Hustedt) Lange-Bertalot, as well as some representatives of the genus Pinnularia: P. eifelana (Krammer) Krammer, P. erratica Krammer, P. turbulenta (A. Cleve) Krammer. We have found 4 taxa new to the territory of the Russian Far East: Cymbopleura subaequalis (Grunow) Krammer, Gomphonema gracile f. turris Hustedt, Hippodonta subcostulata (Hustedt) Lange-Bertalot, Metzeltin et Witkowski, Placoneis cuneata (Möller ex Foged) Potapova. Apparently, the species diversity of the diatom flora is connected with diverse ecological conditions in a large number of water bodies.