Seasonal dynamics and biomass of mixotrophic flagellate Dinobryon sertularia Ehrenberg (Chrysophyceae) in derbent reservoir (Samsun, Turkey)

Fototrofi ile heterotrofiyi birleştiren miksotrofik protistler ötrofik sularda bol bulunurlar. Tatlısu fitoplanktonik flagellatlılarından olan Dinobryon sertularia Ehr. Chrysophyceae’den (altın sarısı algler), koloni oluşturan, planktonik, göl, gölet ve baraj gölü fitoplanktonunda zaman zaman aşırı çoğalmalar yapan miksotrofik bir organizmadır. Bu çalışma Orta Karadeniz Bölgesi’nde yer alan Derbent Baraj Gölü’nde yapılmıştır. D. sertularia’nın mevsimsel dinamiği ve biyoması dört istasyonda Şubat 2001-Temmuz 2002 arasında incelenmiştir. D. sertularia, ilkbaharda fitoplanktonun %47-60’ını, yazın %61-79’unu, sonbaharda ise %82-88’ini oluşturmuştur. Ağustos (2001) ayında en yüksek sayılarda kaydedilen D. sertularia (18.740-13.140 cells ml-1), bu ayda fitoplankton biyomasına önemli katkı sağlamıştır. Mevcut çalışmada biyomas üretimi ve derinlik arasında zıt bir ilişkinin olduğu tespit edilmiştir. Bray-Curtis benzerlik indeksine göre 3. ve 4. istasyonlar ile 1. istasyonun 4-6 m derinlikleri arasında %88 oranında benzerlik kaydedilmiştir. Oligo-mezotrofik karakterli, bazik özellik gösteren (7,98) ve ortalama sıcaklığı 15,56 °C olan Derbent Rezervuarı’nda D. sertularia her mevsim dominant ve çok yaygın organizmalar içinde yer almıştır.

Anahtar Kelimeler:

Samsun, Chrysophyta, biyokütle, fitoplankton, Türkiye, flagellat, mevsimler

Derbent Rezervuarı’nda (Samsun, Türkiye) miksotrofik flagellat Dinobryon sertularia Ehrenberg (Chrysophyceae)’nın biyoması ve mevsimsel dinamiği

Mixotrophic protists, combining both heterotrophy and phototrophy, are found abundantly in eutrophic waters. Dinobryon sertularia Ehr. from Chrysophyceae (golden algae) are mixotrophic organisms often make up blooms and colony in pools, lakes and dam reservoirs. This study was carried out in Derbent Dam Lake in the Middle Black Sea Region. Seasonal dynamics and biomass of D. sertularia were investigated at four stations between February 2001 and July 2002. D. sertularia consisted of 47-60% in spring, 61-79% in summer, and 82-88% in autumn of all phytoplankton population. In August 2001, D. sertularia was calculated in the highest amounts numbers (18,740-13,140 cells ml-1). This species provided important contributions to phytoplankton biomass. In the present study, it was found that there is an inverse correlation between water depth and phytoplankton biomass production. According to Bray-Curtis Similarity Indice, 88% similarity was determined among Station 3, Station 4 and 4-6 m of Station 1. D. sertularia was dominant and common organism in all seasons. The reservoir water was defined as oligomesotrophic and alkaline characters (pH 7.98), and average temperature was 15.56○C.

Keywords:

Samsun, Chrysophyta, biomass, phytoplankton, Turkey, flagellates, seasons,

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