A. Muzaffer FEYZIOGLU, COŞKUN ERÜZ, İLKNUR YILDIZ

Geographic Variation of Picocyanobacteria Synechococcus spp. along the Anatolian Coast of the Black Sea during the Late Autumn of 2013

Pikoplankton 0,2 ile 2 µm arasında boyuta sahip olan fitoplanktonun küçük grubudur ve Synechococcus spp. chroococcoid cyanobacteria gruplarını içerir. Okyanuslarda fotosentetik biokütleye büyük katkı yapan grup olarak bilinirler. Son yıllarda bu grubun önemi artmıştır. Bu çalışmanın amacı Anadolu kıyıları boyunca pikoplanktonik Synechoccocus spp. gruplarının biyokütlesinin geç sonbahar döneminde coğrafik farklılıklarını belirlemektir. Örnekleme programı 15 Ekim-11 Kasım 2013 tarihleri arasında yürütülmüştür. Örnekler İğneada- Hopa arasında yer alan kıyı ile 15 deniz mili arasında kalan sahada 57 istasyonun yüzey suyundan alınmıştır.Sıcaklık (°C), Tuzluluk (ppt) sigma-t, iletkenlik (S m-1) and Çözünmüş Oksijen (mg L-1) gibi deniz suyunun fiziko-kimyasal özellikleri her istasyondan Sea & Sun Tech M75 CTD profiler kullanılarak toplanmıştır. Ototrof planktonik hücreler ACCURY C6 flowcytometre kullanılarak sayılmıştır. Çalışma döneminde yüzey suyu sıcaklıkları 16,2-18,2°C arasında değişmiştir. Yüzey ile 20 metre arasındaki sularda tabakalaşma gözlenmemiştir. Termoklin 35-60 m arasında bulunmuştur. Sonuçlarımız son yıllarda pikoplankton biyokütlesinin Güney Karadeniz'in kıyısal bölgelerinde artığını göstermiştir. En düşük ve en yüksek Synechococcus spp. yoğunluğu sırasıyla 7.4x103 hücre ml-1 ve 9.2 x104 hücre ml-1 olarak Şile ve Kızılırmak nehrinin ağızında bulunmuştur. Sonuçlar Şile ve Kızılırmak alanlarının diğer örnekleme alanlarından farklı bir pikoplanktonik yapıya sahip olduğunu göstermiştir

Karadenizin Anadolu Kıyılarında 2013 Geç Sonbahar Döneminde Pikoplankton (Synechococcusspp.)'nun Coğrafik Dağılımı

Picoplankton are particularly small phytoplankton with sizes between 0.2 and 2 µm and mostly include chroococcoid cyanobacteria, Synechococcus spp. They are major contributors to the total autotrophic biomass in the oceans. The importance of this group has increased in recent years. The aim of the study is to determine the geographic variation of picoplanktonic Synechoccocus spp. biomass along the Anatolian coast during late autumn. The sampling program was carried out from October 15 and 11 November 2013. Sample were collected from surface water of 57 station which were located between the coast line and 15 miles off between İğneada-Hopa. Physico-chemical properties of sea water like temperature (°C), salinity (ppt), sigma-t, conductivity (S m-1) and Dissolved Oxygen (mg L-1) were also collected from each station with Sea & Sun Tech M75 CTD profiler. Autotrophic picoplanktonic cells were counted by using ACCURY C6 flowcytometer. Results were given as cells ml-1. Sea surface temperature ranged between 16.2-18.2°C. Stagnated water was observed from surface to 20 m and thermocline developed between 35-60 m. Our results showed that picoplankton concentrations increasedin recent years in the coastal area of Southern Black Sea. The lowest and the highest Synechococcus spp. concentrations were found as 7.4x103 cells ml-1 and 9.2 x104 ml-1 in Şile off and mouth of Kızılırmak River respectively. The results indicate that Şile and Kızılırmak area shown different picoplanktonic structure among the other sampling region

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