Trophic State Assessment of Brackish Bafa Lake (Turkey) Based on Community Structure of Zooplankton

Abstract

Zooplankton abundance and composition are one of the most important factors which affect the food web in aquatic ecosystems. The purpose of this study was to determine the water quality of Bafa Lake in Turkey, based on zooplankton communities. As the study case, Bafa Lake is one of the biggest lake in Turkey, and the lake is quite rich in terms of biodiversity. Bafa Lake is the under effects of domestic, agricultural and industrial wastes that accumulate and cause the deterioration of ecology in the lake by Büyük Menderes River. With this purpose, 8 sampling sites were determined and zooplankton samples were collected monthly for two years. TSINRot index and various versions of diversity indices were used to determine the water quality and ecological status of Bafa Lake. To determine similarities between the stations, the stations were clustered by using UPGMA based on zooplankton fauna. By applying Pearson Correlation, correlations between the indices based on zooplankton fauna were assessed. With the identification of collected zooplankton, a total of 73 taxa which belong to groups of Rotifera, Cladocera, Copepoda, and Meroplankton were detected. As a result of similarity analysis, most similarity values were obtained between stations 1, 2 and 8, respectively. According to TSINRot index, Bafa Lake has got a eutrophic ecological state while according to all versions of diversity indices, Bafa Lake has got the α-β mesosaprobic ecological state.

Keywords

• Bafa Lake
• Zooplankton
• Water Quality
• Trophic State Index
• Diersity Indices

Acı Su Özelliğindeki Bafa Gölü’nün Zooplankton Topluluk Yapısına Göre Trofik Durumunun Belirlenmesi

Öz

Zooplankton miktarı ve dağılımı sucul ekosistemlerde besin ağını etkileyen en önemli faktörlerden biridir. Bu çalışmanın amacı, Türkiye'deki Bafa Gölü'nün su kalitesini zooplankton topluluklarını baz alarak belirlemektir. Çalışma alanı olarak Bafa Gölü, Türkiye'nin en büyük göllerinden biri olmakla birlikte göl biyolojik çeşitlilik açısından oldukça zengindir. Bafa Gölü, Büyük Menderes Nehri tarafından taşınarak gölde ekolojinin bozulmasına neden olan evsel, tarımsal ve endüstriyel atıkların etkisi altındadır. Bu amaçla 8 örnekleme alanı belirlenmiş ve zooplankton örnekleri iki yıl boyunca aylık olarak toplanmıştır. Bafa Gölü'nün su kalitesini ve ekolojik durumunu belirlemek için TSINRot indeksi ve çeşitlilik indekslerinin çeşitli versiyonları kullanılmıştır. İstasyonlar arasındaki benzerlikleri belirlemek için, istasyonlar zooplankton faunası temelli UPGMA kullanılarak kümelendirilmiştir. Pearson Korelasyonu uygulanarak, zooplankton faunasına dayalı indeksler arasındaki korelasyonlar değerlendirilmiştir. Toplanan zooplanktonik organizmaların tanımlanmasıyla Rotifera, Cladocera, Copepoda ve Meroplankton gruplarına ait toplam 73 takson tespit edilmiştir. Benzerlik analizi sonucunda, en yüksek benzerlik değerleri sırasıyla 1., 2. ve 8. istasyonları arasında elde edilmiştir. TSINRot indeksine göre, Bafa Gölü ötrofik ekolojik duruma sahipken, çeşitlilik indekslerinin tüm versiyonlarına göre, Bafa Gölü α-β mezosaprobik ekolojik duruma sahiptir.

Anahtar Kelimeler

• Bafa Gölü
• Zooplankton
• Su Kalitesi
• Trofik Durum İndeksi
• Çeşitlilik İndeksleri

Kaynakça

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