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    DIATOMS OF SEYDISUYU STREAM BASIN (TURKEY) AND ASSESSMENT OF WATER QUALITY BY STATISTICAL AND BIOLOGICAL APPROACHES
    (Yildiz Technical Univ, 2018) Atici, Tahir; Tokatli, Cem; Cicek, Arzu
    In the present study, diatom flora of Seydisuyu Stream Basin (Turkey) was investigated and the water quality of the system was evaluated in a statistical and biological view. Epipelic (EPP), epilithic (EPL) and epifitic (EPF) diatoms were seasonally collected from 12 stations in 2012 along the Seydisuyu Stream Basin and some physical and chemical water quality parameters (temperature, salinity, TDS, pH, ORP, conductivity, nitrate, nitrite and phosphate) were measured during the field and laboratory studies. Biological Diatom Index (IBD) was used to assess the water quality of the basin and some mono (Pearson Correlation Index and Matrixplot Distribution Diagrams) and multi (Cluster Analysis and Factor Analysis) statistical methods were applied to detected all physical, chemical and biological data. According to data observed, Seydisuyu Stream Basin has II. - III. Class water quality in terms of investigated water quality parameters (Turkish Regulations) and a total of 48 diatom species were recorded for the basin by counting a total of 22.229 valves. Cymbella lanceolata, Diatoma vulgare, Fragilaria construens, Hantzschia amphioxys, Meridion circulare, Navicula cincta, Neidium iridis, Navicula venata, Pinnularia brebissonii, Synedra acus and Surirella ovata were the most dominant species in the region. According to result of IBD, the investigated region was in a mesotrophic state and has a moderate water quality. According to results of Factor Analysis, 9 factors explained 81.29% of the total variance and according to results of Cluster Analysis, stational similarity coefficients were determined as IBD Indices (0.98) > Environmental Parameters (0.85) > Diatom Flora (0.77) respectively.
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    EPIPHYTIC DIATOMS IN ENVIRONMENTAL BIOINDICATION: A CASE STUDY OF A SIGNIFICANT NATURAL LAKE IN THE NORTHWEST OF TURKEY
    (Wydawnictwo Uniwersytetu Rolniczego Hugona Kollataja Krakowie, 2023) Tokatli, Cem; Solak, Cuneyd Nadir; Islam, Abu Reza Md. Towfiqul; Titiz, Ahmet Mirac; Yilmaz, Elif; Atici, Tahir
    Aim of the study The Gala Lake, which has a status of National Park and is a protected area, is the one of the most important natural stagnant water bodies in the Marmara Region of Turkiye. However, it is under effect of a significant agricultural stress, mainly resulting from paddy cultivation of rice. In this research, epiphytic diatoms of Gala Lake were investigated, and trophic status of the lake was assessed by applying the Biological Diatom Index (BDI). Material and methods Epiphytic diatom samples were collected from the submerged macrophytes from 5 selected locations on the lake (G1-G5) with varying ecological character, and observed to be exposed to different pollution pressures. Results and conclusions As a result of collecting taxonomic data, 37 diatom species were recorded by identifying a total of 2095 valves, and Cyclotella meneghiniana, Bacillaria paxillifera, and Navicula recens were found as the most dominant species for the Gala Lake. According to the results of bioindication data, Gala Lake was found to be in a eutrophic state-having poor water quality in terms of applied BDI.
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    Research into the Epipelic Diatoms of the Meric and Tunca Rivers and the Application of the Biological Diatom Index in Water Quality Assessment
    (Istanbul Univ Press, Fac Aquatic Sciences, 2020) Tokatli, Cem; Solak, Cuneyt Nadir; Yilmaz, Elif; Atici, Tahir; Dayioglu, Hayri
    The Meric River is one of the longest rivers of the Balkans and the Tunca River is the most significant tributary of the Meric River. In the present study, the epipelic diatoms of the Meric and Tunca Rivers were investigated and the water quality was evaluated from a physicochemical and biological perspective. Epipelic (EPP) diatoms were collected from the middlestream of the Meric River (Edirne Province of Turkey) and from the downstream of the Tunca River (before emptying into the Meric River) and certain physicochemical parameters including dissolved oxygen (DO), oxygen saturation (OS), pH, electrical conductivity (EC), total dissolved solids (TDS), salinity, turbidity, nitrate (NO3), nitrite (NO2), ammonium (NH4), phosphate (PO4), sulphate (SO4), chemical oxygen demand (COD) and oxidation-reduction potential (ORP) were measured during the field studies. The Biological Diatom Index (IBD) was used to determine the trophic status of the Meric and Tunca Rivers in terms of EPP diatoms, and Cluster Analysis (CA) was applied to the detected biological data in order to classify the identified diatom taxa in terms of their dominance in the system. According to the results of the physicochemical analysis, the Meric and Tunca Rivers have I. - II. Class water quality in terms of dissolved oxygen, oxygen saturation, pH, EC, TDS, NO3, NH4, SO4 and COD parameters; and have III. - IV. Class water quality in terms of NO2 and PO4 parameters. 24 diatom species were recorded in the Meric River by counting a total of 403 valves and a total of 19 diatom species were identified by counting a total of 409 diatom valves in the Tunca River. Cyclotella atomus Hustedt, Navicula gregaria Donkin, Nitzschia palea (Kutzing) W.Smith and Nitzschia subacicularis Hustedt, were determined as the most dominant species in the Meric River and Navicula erifuga Lange-Bertalot, Navicula gregaria Donkin and Navicula rostellata Kutzing were recorded as the most dominant taxa in the Tunca River. According to the result of the IBD, the investigated rivers were found to be in a meso-eutrophic state and according to the results of CA, three statistical clusters were formed for both rivers, and were named as dominant taxa, frequent taxa and rare taxa.