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Assessment of running water quality in the Asi River Basin (Türkiye) using diatom indices

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Abstract

Ecological quality evaluations using diatoms, which are accepted as one of the biological quality components have accelerated recently in different basins of Türkiye. Asi Basin which has a small catchment area within the borders of Türkiye, located near to Syrian border and is under the influence of a Mediterranean climate. This study aims to determine the water quality of the streams in this basin by using various diatom indices and to determine the environmental pressures affecting the diatom community structure. In this study, 21 rivers of the Asi Basin were sampled three times during 2019 to evaluate their ecological status by using 18 different diatom indices. A total of 157 diatom taxa were recorded in these rivers. Different environmental variables were also sampled combined with diatoms, and according to RDA, alkalinity (ALK), electrical conductivity (EC), total phosphorus (TP), and total nitrogen (TN) were determined as the most decisive pressures for the distribution of diatom assemblages. In terms of TN, Bayrak River (R7), while in terms of TP, Üçocak River (R12) have II. class water quality. The eight diatom indices showed significant correlations with TP (p < 0.01). The Trophic-Saprobic index (LOBO) showed the highest response to the TP (R2 = 0.63) and was consistent with the indicator species. This index was also compatible with the evaluation results made according to the water quality classes of the sites. LOBO index classified these rivers as high-good or poor-bad effectively in terms of TP. It was the first time that the LOBO which was developed to evaluate the surface freshwaters of Brazil has a high correlation with TP in a basin of Türkiye.

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Acknowledgments

This study has been prepared by using the data obtained within the scope of “Establishment of Reference Monitoring Network in Türkiye” (2017-2020) (Project number: 2011 K050400) carried out under the responsibility of the Ministry of Agriculture and Forestry, General Directorate of Water Management.

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Authors and Affiliations

  1. Faculty of Science, Department of Biology, Sakarya University, 54050, Sakarya, Türkiye

    Tuğba Ongun Sevindik, Hatice Tunca, Ayşe Gül Tekbaba & Uğur Güzel

  2. T.R. Ministry of Agriculture and Forestry, Directorate General of Water Management, Ankara, Türkiye

    Tolga Çetin

  3. Faculty of Arts and Science, Department of Biology, Dumlupınar University, Kütahya, Türkiye

    Elif Yilmaz

  4. Institute of Marine and Environmental Sciences, University of Szczecin, Szczecin, Poland

    Elif Yilmaz

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  1. Tuğba Ongun Sevindik
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  4. Hatice Tunca
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  5. Ayşe Gül Tekbaba
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Contributions

Tuğba ONGUN SEVİNDİK designed the experiments, conducted the field sampling, identified and counted the diatoms, analyzed the data, and wrote the text. Tolga ÇETİN participated in project management, designed the experiments and analyzed the data. Elif YILMAZ, Uğur GÜZEL, Hatice TUNCA and Ayşe Gül TEKBABA conducted the field sampling and data curation. All authors read and agreed to the published version of the manuscript.

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Ongun Sevindik, T., Çetin, T., Yilmaz, E. et al. Assessment of running water quality in the Asi River Basin (Türkiye) using diatom indices. Biologia 79, 685–699 (2024). https://doi.org/10.1007/s11756-024-01602-y

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