tailieunhanh - The relationship between seasonal variation in phytoplankton and zooplankton densities in Hirfanli Dam lake (Kirflehir, Turkey)

Phytoplankton and zooplankton densities in Hirfanli Dam Lake were studied between July 1999 and June 2000. In addition, phytoplankton biomass was measured using chlorophyll a concentration. The density of Cladocera at the surface and that of Rotifera at the bottom were low in the summer months. For phytoplankton, Cyclostephanos dubius (Fricke) Round was dominant. | Turk J Biol 30 (2006) 217-226 © TÜB‹TAK The Relationship between Seasonal Variation in Phytoplankton and Zooplankton Densities in Hirfanl› Dam Lake (K›rflehir, Turkey) 1 2 2 Tülay BAYKAL , Selahattin SALMAN , ‹lkay AÇIKGÖZ 1 Gazi University, K›rflehir Education Faculty, Department of Biology, 40100, K›rflehir - TURKEY 2 Gazi University, Gazi Education Faculty, Department of Biology, Ankara – TURKEY Received: Abstract: Phytoplankton and zooplankton densities in Hirfanl› Dam Lake were studied between July 1999 and June 2000. In addition, phytoplankton biomass was measured using chlorophyll a concentration. The density of Cladocera at the surface and that of Rotifera at the bottom were low in the summer months. For phytoplankton, Cyclostephanos dubius (Fricke) Round was dominant. The variation in the density of organisms did not follow a known pattern. Species composition, seasonal distribution and species density variations show that the lake was advanced mesotrophic. The lake was alkaline and, from time to time, there was an odor in the littoral regions where algal bloom occurred. Key Words: Hirfanl› Dam Lake, phytoplankton, zooplankton, density, seasonal variation Hirfanl› Baraj Gölü Fitoplankton ve Zooplankton Yo¤unluklar›n›n Mevsimsel De¤iflimi Aras›ndaki ‹liflki (K›rflehir-Türkiye) Özet: Hirfanl› Baraj Gölü fitoplankton ve zooplankton yo¤unlu¤u Temmuz 1999 – Haziran 2000 y›llar› aras›nda incelenmifltir. Ayr›ca, fitoplankton biyomas› için klorofil a konsantrasyonu ölçülmüfltür. Yaz aylar›nda yüzeyde Cladocera, derinde Rotifera üyeleri düflük yo¤unluklarda; fitoplanktonda ise Cyclostephanos dubius (Fricke) Round dominantt›r. Organizma yo¤unluklar›n›n mevsimsel da¤›l›m› beklenen düzende gerçekleflmemifltir. Tür kompozisyonu, mevsimsel da¤›l›m ve organizma yo¤unluklar›ndaki de¤iflimler gölün ileri mezotrofik oldu¤unu göstermektedir. Göl alkali ve alg patlamalar›n›n oldu¤u k›y› bölgelerinde zaman zaman kokuflmalar olmaktad›r. Anahtar Sözcükler: .