Fatma ÃƒÂƒÃ†Â’ÃƒÂ‚Ã¢Â€Â¡OLAK SABANCI, Tufan KORAY
Tintinnid species composition and abundance were examined seasonal at 9 stations (0.5 m, 5.0 m, 10.0 m and 15.0 m) in Izmir Bay between November 2008 and July 2010. During the study period, belonging to the class Ciliata, 17 taxa were determined. Stenosemella nivalis, Tintinnopsis cylindrica and Undella hyalina were the dominant species observed in almost all the stations. The lowest number of species was found in April 2009 with 3 species whereas the highest number of species was determined in March 2010 with 12 species. The minimum and the maximum cell density of the class Ciliata were observed in April 2009 (0.039x103 cell lt-1), and July 2010 (152x103 cell lt-1) respectively. In this period, the species with respect to the high cell density were Helicostomella subulata, Salpingella decurtata and Steenstrupiella steenstrupii. These three species reached their maximum cell densities in the stations located in the inner bay where the environment was under the influence of domestic and industrial wastewaters. The Shannon-Wiener diversity index values varied between 0.032 (Station 22) and 2.165 (Station 20). Additionally, a negative relationship was determined between tintinnid and phytoplankton abundance.