Bioassessment of Ecological Status of Three Aegean Reservoirs Based on Phytoplankton Metrics

Öz

Avrupa Birliği Su Çerçeve Direktifi’nin uygulanmasıyla birlikte su kalitesinin değerlendirilmesi büyük önem kazanmıştır. Bu çalışmada, Türkiye’nin Kuzey Ege Nehir Havzası’nda bulunan üç barajın su kalitesi Akdeniz Fitoplankton Trofik İndeksi (Med-PTI) ve Fitoplankton Trofik İndeksi (PTI) kullanılarak değerlendirilmiştir. Veriler üç barajdan 2014 ve 2015 yaz dönemi arasında mevsimsel olarak toplanmıştır. Üç baraj alkali su özelliği göstermiştir. En yüksek nutrient değerleri olarak TP (203,5 µg L^-1) Bayramiç Baraj Gölü’nde ve TN (1012,0 µg L^-1) Sevişler Barajı’nde kaydedilmiştir. Toplamda 120 tür teşhis edilmiş ve türlerin çoğunluğu Bacillariophyta ile temsil edilmiştir. Fitoplankton türleri ve çevresel değişkenler arasındaki ilişki multivaryete analizler ile incelenmiştir. Fitoplankton kompozisyonu ve dağılımı çevresel değişkenler yönetmiştir. Toplam fosfor, ortofosfat, toplam Kjeldahl azotu, biyolojik oksijen ihtiyacı, toplam organik karbon ve sıcaklık en önemli faktörler olmuştur. İlk iki CCA ekseni tür verisinin kümülatif yüzde varyansının %31’ini %97,7 tür-çevre korelasyonu ile açıklamış ve durum Monte Carlo testi (p= 0,002 ve F = 1,157) ile doğrulanmıştır. Med-PTI, Ayvacık ve Bayramiç Barajları için iyi su kalitesini gösterirken Sevişler Barajı’nı orta su kalitesinde indike etmiştir. PTI’ye göre Bayramiç ve Sevişler Barajları orta ekolojik durumda sınıflandırılmışken Ayvacık Barajı iyi su kalitesinde indike edilmiştir. Sonuçlara göre, Med-PTI ve PTI’nin Kuzey Ege Havzası’nda bulunan barajların su kalitesinin değerlendirilmesinde uygun metrikler olduğu görülmüştür.

Anahtar Kelimeler

• Water quality,Phytoplankton,Med-PTI,PTI,Reservoir

Kaynakça

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