Assessment of the ecological and trophic status of Lake Bafa (Turkey) based on phytoplankton

Atakan Sukatar; Alperen Ertaş; Rıza Akgül; İnci Tüney Kızılkaya

doi:10.12714/egejfas.38.2.01

EN TR

Assessment of the ecological and trophic status of Lake Bafa (Turkey) based on phytoplankton

Abstract

Phytoplankton groups are one of the major quality element to be used in the evaluation of the trophic and ecological state of freshwater ecosystems according to the EU Water Framework Directive. This research was made to assess the trophic and ecological status of Lake Bafa in Turkey, on the basis of phytoplankton communities. Büyük Menderes River is one of the most important factor that carries pollutants to Lake Bafa. The eight sampling station were assigned to evaluate the ecological and trophic state of the lake. Phytoplankton species were collected monthly for 2 years study period. Most commonly used phtoplankton indices Q index and Carlson’s Trophic State Index (TSI), and different versions of diversity indices were used to estimate trophic and ecological state of the lake. Similarities between the sampling stations were clustured by using the unweighted pair group method using arithmetic average (UPGMA), based on phytoplankton communities. Correlations between the applied indices were determined by using Pearson Correlation. After the identification of collected phytoplanktons, total of 63 taxa which belong to classis of Cyanophyceae (11.2%), Bacillariophyceae (49.2%), Chlorophyceae (23.8%), Xanthophyceae (1.5%), Euglenophyceae (11.2%) and Dinophyceae (3.1%) were detected. The 1^stand 2^nd stations were the most similar stations to each other (88%) according to phytoplankton communities. Secchi disc depth (SD) and TP played an important role in the distribution of phytoplankton species in Lake Bafa. The highest significant positive correlation was determined between Q and TSI (r = 0.987, p˂0.01). Considering the TDI values in the phytoplankton composition of the lake, it can be said that although the productivity status of the studied lake is still “mesotrophic”, it has a tendency towards “eutrophic” state. According to the Q values, the first five stations reflect the moderate ecological state, while the 6^th, 7^th and 8^th stations represent the poor ecological state.

Keywords

Bafa Gölü'nün (Türkiye) ekolojik ve trofik durumunun fitoplankton bazlı değerlendirilmesi

Öz

Fitoplankton, AB Su Çerçeve Direktifi'ne göre tatlı su ekosistemlerinin trofik ve ekolojik durumunun değerlendirilmesinde kullanılan en önemli kalite unsurlarından biridir. Bu araştırma, Bafa Gölü'nün trofik ve ekolojik durumunu fitoplankton grupları temel alarak değerlendirmek için yapılmıştır. Büyük Menderes Nehri, kirleticileri Bafa Gölü'ne taşıyan en önemli faktörlerden biridir. Gölün ekolojik ve trofik durumunu değerlendirmek için sekiz örnekleme istasyonu belirlenmiştir. Fitoplankton türleri 2 yıllık çalışma süresi boyunca aylık olarak toplanmıştır. Gölün trofik ve ekolojik durumunu tahmin etmek için en yaygın kullanılan fitoplankton indeksleri Q indeksi ve Carlson'un Trofik Durum İndeksi (TDI) ve çeşitlilik indekslerinin farklı versiyonları kullanılmıştır. Uygulanan indeksler arasındaki korelasyonlar Pearson Korelasyonu kullanılarak belirlenmiştir. Örnekleme istasyonları arasındaki benzerlikler, fitoplankton topluluklarına dayanan aritmetik ortalama ile ağırlıksız çift grup metodu (UPGMA) kümeleme yöntemiyle belirlenmiştir. Toplanan fitoplankton örneklerinin tanımlanmasından sonra, Cyanophyceae (11.2%), Bacillariophyceae (49.2%), Chlorophyceae (23.8%), Xanthophyceae (1.5%), Euglenophyceae (11.2%) ve Dinophyceae (3.1%) sınıflarına ait toplam 63 takson tespit edilmiştir. Fitoplankton topluluklarına göre 1. ve 2. istasyonlar (%88) birbirlerine en yakın istasyonlar olduğu görülmüştür. Secchi disk derinliği (SD) ve TP Bafa Gölünde fitoplankton türlerine dağılımında önemli rol oynamıştır. En yüksek anlamlı pozitif korelasyon Q ve TDI arasında belirlenmiştir (r =0.987, p˂0.01). Gölün fitoplankton dağılımındaki TDI değerleri göz önüne alındığında, incelenen gölün verimlilik durumu halen “mezotrofik” olmakla birlikte, “ötrofik” duruma doğru bir eğilim gösterdiği söylenebilir. Q değerlerine göre, ilk beş istasyon orta ekolojik durumu yansıtırken, 6., 7. ve 8. istasyonlar kötü ekolojik durumu temsil etmektedir.

Anahtar Kelimeler

Supporting Institution

TUBİTAK

Project Number

114Y249

Thanks

Bu araştırmaya verdikleri desteklerden ötürü Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TUBİTAK)'a yazarlar teşekkür etmektedir. (TUBITAK, Proje no: 114Y249)

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Details

Primary Language

English

Subjects

Limnology

Journal Section

Research Article

Authors

Atakan Sukatar
0000-0002-1895-0165
Türkiye

Alperen Ertaş ^*
0000-0001-8510-6100
Türkiye

Rıza Akgül
0000-0002-0280-2897
Türkiye

İnci Tüney Kızılkaya
0000-0003-0293-6964
Türkiye

Publication Date

June 15, 2021

Submission Date

March 22, 2020

Acceptance Date

December 20, 2020

Published in Issue

Year 1970 Volume: 38 Number: 2

DOI

https://doi.org/10.12714/egejfas.38.2.01

IZ

https://izlik.org/JA82YS86YR

Cite

RIS / Bibtex

APA

Sukatar, A., Ertaş, A., Akgül, R., & Tüney Kızılkaya, İ. (2021). Assessment of the ecological and trophic status of Lake Bafa (Turkey) based on phytoplankton. Ege Journal of Fisheries and Aquatic Sciences, 38(2), 135-146. https://doi.org/10.12714/egejfas.38.2.01

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