Phytoplankton and Nutrient Variations in the Iranian Waters of the Caspian Sea (Guilan region) during 2003-2004

Yıl 2014, Cilt: 14 Sayı: 1, - , 07.07.2014

Siamak Bagheri Muhammet Turkoglu Ali Abedini

https://doi.org/10.4194/1303-2712-v14_1_25

Öz

This study concentrated on temporal distribution and species composition of phytoplankton connected with physicochemical variations between January 2003 and November 2004 in the South Western Caspian Sea. During the study, 75 phytoplankton were distinguished in total and average phytoplankton densities in 2003 and 2004 were 1.47×10±6.05×10and 1.97×10±7.18×10 cells L, respectively. Contributions of diatoms (66.0% in 2003; 57.0% in 2004) and cyanophytes to total phytoplankton (17.0 in 2003; 36.0% in 2004) were higher than any other group. Diatoms Dactyliosolen fragilissimus and Thalassionema nitzschioides, and cyanophytes Oscillatoria sp. and Anabeanopsis raciborskii provided the biggest contributions to the total phytoplankton. Average DIN concentration in 2003 was higher (3.86±1.65 µM) than the average in 2004 (3.37±1.13 µM). However, average DIP concentration in 2003 was lower (1.45±1.37 µM) than the average in 2004 (1.99±0.67 µM). Average DIS concentration was two-fold higher than average DIN concentration. Average DIN:DIP without NH (2.66±1.66 in 2003; 1.69 ± 1.17 in 2004) and DIS:DIP ratios (5.61±3.44 in 2003; 3.93±2.49 in 2004) were clearly lower than Redfield ratios. Nutrient ratios and phytoplankton densities revealed that system was eutrophic

Anahtar Kelimeler

Phytoplankton, checklist, cell density, nutrient, Caspian Sea.

Phytoplankton and Nutrient Variations in the Iranian Waters of the Caspian Sea (Guilan region) during 2003-2004

Öz

Bu çalışmada, Güney Batı Hazar Denizinde fiziksel ve kimyasal değişimlerle ilişkili olarak Ocak 2003 – Kasım 2004 döneminde zamana bağlı fitoplankton değişimleri ve fitoplankton tür kompozisyonu incelenmiştir. Çalışma süresince, toplam 75 fitoplankton türü tanımlandı ve 2003 ve 2004’deki toplam fitoplankton yoğunlukları sırasıyla 1,47×10±6,05×10 ve 1,97×10±7,18×10 hücre L olarak bulundu. Diyatomelerin toplam fitoplanktona olan katkıları (2003’de 66,0%; 2004’de 57.0%) ile siyanofitlerin toplam fitoplanktona olan katkıları (2003’de 17,0%; 2004’de 36,0%) diğer grupların katkılarından daha yüksekti. Diyatomelerden Dactyliosolen fragilissimus ve Thalassionema nitzschioides; siyanofitlerden Oscillatoria sp. ve Anabeanopsis raciborskii toplam fitoplanktona en büyük katkıyı sağladılar. 2003’deki ortalama DIN konsantrasyonu (3,86±1,65 µM) 2004’deki konsantrasyonundan (3,37±1,13 µM) daha yüksekti. Bununla birlikte, 2003’deki ortalama DIP konsantrasyonu (1,45±1,37 µM) 2004’deki ortalama DIP konsantrasyonundan (1,99±0,67 µM) daha düşüktü. Ortalama DIS konsantrasyonu ortalama DIN konsantrasyonundan iki kat daha yüksekti. NH olmaksızın ortalama DIN:DIP (2003’de 2,66±1,66; 2004’de 1,69±1,17) ve DIS:DIP oranları (2003’de 5,61±3,44; 2004’de 3,93±2,49) açık bir şekilde Redfield oranlarından düşüktü. Nütrient oranları ve fitoplankton yoğunlukları ile ilgili sonuçlar sistemin ötrofik olduğunu göstermiştir.

Anahtar Kelimeler

Fitoplankton, tür listesi, hücre yoğunluğu, nütrient, Hazar Denizi.

Kaynakça

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