A study on the seasonal variation of the phytoplankton of lake cernek (Samsun-Turkey)

Abstract

Seasonal variations of the pytoplankton of Lake Cernek were studied between January 1996 and June 1997. Cyclotella ocellata and Nitzschia acicularis, members of Bacillariophyta produced bloom during the spring and autumn in the phytoplankton. Chlorophyta division were occurred to be the most widespread and dominant algal group in the phytoplankton. Monoraphidium caribeum, M. irreguläre, Scenedesmus quadricauda, Oocystis borgei and Pediastrum boryanum have been the most abundant species present during the blooming in spring and autumn months. Cyanophyta members (Microcystis aeruginosa, Anabaena affinis and A. spiroides) produced bloom during the summer. In addition, Euglena gracilis, E. polymorpha (Euglenophyta) were generally present in the phytoplankton. Cryptophyta division was represented by Cryptomonas ovata and Dinophyta division Gymnodinium sp. was both of which increased in January. Xanthophyta division was represented by Characiopsis cylindrica and while it was very dense in March 1996, it was found very few in the other months. There were no an important differences from side species contents, seasonal variations and the total amount of present groups found in the surface and in 1 meter depth of stations