Phytoplankton Dynamics and Some Physicochemical Variables in Cakmak Reservoir (Samsun, Turkey)

Öz

Phytoplankton dynamics and some physicochemical properties of Cakmak Reservoir were investigated between May 2003 and April 2005 which is used for irrigation and drinking water supply. A total of 132 taxa were identified belonging to the following divisions; Cyanobacteria, Charophyta, Chlorophyta, Cryptophyta, Euglenozoa, Myzozoa and Ochrophyta. Although Ochrophytes were rich in respect to species diversity, Chlorophytes attained a larger population density. Ulnaria ulna, Fragilaria tenera and Goniochloris mutica from Ochrophyta, Chlorella vulgaris, Monoraphidium obtusum and Ulothrix tenerrima from Chlorophyta, Cryptomonas ovata and C. erosa from Cryptophyta increased in some months. The seasonal variation of phytoplankton based on depth was compatible with surface water. Phytoplankton abundance was lower in winter and there was an increase in summer in Cakmak Reservoir. The reservoir water was slightly alkaline according to the pH; was alkaline according to the calcium; was in the slightly hard water group according to the hardness values; had low and medium productivity degree according to the phosphorus.

Anahtar Kelimeler

• Phytoplankton, reservoir, seasonal variation, water properties

İçme suyu temini ve sulama lı kurulan Çakmak Baraj Gölü’nün fitoplankton dinamiği

Öz

İçme suyu temini ve sulama amaçlı kurulan Çakmak Baraj Gölü’nün fitoplankton dinamiği ve bazı fizikokimyasal özellikleri Mayıs 2003 - Nisan 2005 tarihleri arasında incelenmiştir. Cyanobacteria, Charophyta, Chlorophyta, Cryptophyta, Euglenozoa, Myzozoa ve Ochrophyta divizyolarına ait 132 takson tespit edilmiştir. Ochrophyta divizyosu tür çeşitliliği açısından zengin olmasına rağmen Chlorophyta divizyosunun populasyon büyüklüğü daha fazladır. Ochrophyta divizyosundan Ulnaria ulna, Fragilaria tenera ve Goniochloris mutica, Chlorophyta divizyosundan Chlorella vulgaris, Monoraphidium obtusum ve Ulothrix tenerrima; Cryptophyta divizyosundan Cryptomonas ovata ve C. erosa türlerinin bazı aylarda sayıca arttığı gözlenmiştir. Derinlik örneklerinde fitoplanktonun mevsimsel değişimi yüzey suyu örnekleri ile benzer mevsimsel değişim göstermiştir. Çakmak Baraj Gölü’nde fitoplankton bolluğu kışın daha düşük iken yaz aylarında artış kaydedilmiştir. Baraj suyunun pH değerlerine göre hafif alkali iken kalsiyum değerlerine göre alkali olduğu; sertlik değerlerine göre hafif sert sular grubunda; fosfor değerlerine göre ise düşük ve orta verimlilik derecesine sahip olduğu belirlenmiştir

Anahtar Kelimeler

• Fitoplankton, baraj gölü, mevsimsel değişim, su kalitesi

Kaynakça

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