The diatom flora of Lake Abant was studied monthly for 2 years (June 2003-June 2005) from 3 littoral and 2 vertical stations. A total of 123 diatom taxa were identified. Some species Asterionella formosa Hassall, Cymbella silesiaca Bleisch, C. cistula Kirchner, Fragilaria bicep. | Turk J Bot 30 (2006) 331-347 © TÜB‹TAK Research Article Net Planktonic Diatom (Bacillariophyceae) Composition of Lake Abant (Bolu) Abuzer ÇELEKL‹* & Okan KÜLKÖYLÜO⁄LU Department of Biology, Faculty of Arts and Science, Abant ‹zzet Baysal University, Gölköy 14280 Bolu - TURKEY Received: Accepted: Abstract: The diatom flora of Lake Abant was studied monthly for 2 years (June 2003-June 2005) from 3 littoral and 2 vertical stations. A total of 123 diatom taxa were identified. Some species (Asterionella formosa Hassall, Cymbella silesiaca Bleisch, C. cistula Kirchner, Fragilaria biceps (Kützing) Lange-Bertalot, F. dilata (Brebisson) Lange-Bertalot, Navicula radiosa Kützing, and Rhopalodia gibba Müller) showed frequent occurrence in each month at all stations. Numbers of diatoms were increased in certain months in autumn, . November (83 taxa) and December (68 taxa) 2003, and August (65 taxa) and September (76 taxa) 2004. Key Words: Lake Abant, Diatom, Systematics Abant Gölü Net Planktonik Diyatom (Bacillariophyceae) Komposizyonu Özet: Abant Gölü diyatom floras› üç k›y›sal ve iki vertikal istasyonda ayl›k olarak iki y›l boyunca (Haziran 2003-Haziran 2005) çal›fl›lm›flt›r. Toplam 123 diyatome taksonu tan›mlan›lm›flt›r. Baz› türler (Asterionella formosa Hassall, Cymbella silesiaca Bleisch, C. cistula Kirchner, Fragilaria biceps (Kützing) Lange-Bertalot, F. dilata (Brebisson) Lange-Bertalot, Navicula radiosa Kützing ve Rhopalodia gibba Müller) bütün istasyonlarda her ay s›kl›kla görülmüfltür. Diyatome tür say›s› Kas›m (83 takson) ve Aral›k (68 takson) 2003, A¤ustos (65 takson) ve Eylül (76 takson) 2004 sonbahar mevsiminin baz› aylar›nda artm›flt›r. Anahtar Sözcükler: Abant Gölü, Diyatom, Sistematik Introduction Diatoms are distributed in a variety of environments from freshwater to marine water over the world, where environmental conditions in terms of some of the major factors (., light, temperature, and chemical components) are suitable .
