Abstract
Bakırçay is one of the important rivers of Western Anatolia, Türkiye. The objectives of this study are (a) to determine the diversity of benthic invertebrates distributed in Bakırçay, (b) to evaluate the obtained data using various biological indices, (c) to determine the interactions of species with environmental variables, and (d) to estimate the water quality level of the river using BMWP and ASPT analyses. Samplings were carried out at 15 stations between October 2017 and July 2018, seasonally. A total of 11,897 specimens belonging to 136 benthic macroinvertebrate taxa were determined. Diptera and Oligochaeta were the dominant groups with 32 (24%) and 25 taxa (18%), respectively. Station 4 has the highest species richness with 49 taxa (36%). The highest individual number (3421) was at the 14th station. Tubifex tubifex and Physella acuta have the highest dominancy (25.76%) and frequency (51.67) values, respectively. Diversity (H’) values of the stations fluctuated between 1.367 (st. 13) and 3.154 (st. 12). Similarity analysis showed that the 3rd and 11th stations have the highest similarity (> 90%), while the 14th station was an outgroup and has 28% similarity ratio. BMWP and ASPT scores gave similar results, and there was no 1st class water quality in the river. On the other hand, the results of the TR-BMWP score suggested that the 1st, 4th, and 6th stations had 1st class water quality. Although some stations are classified as “good conditions,” the adverse effects of pollution were mainly observed in the main channel and downstream of the river.
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This study was carried out by examining the samples obtained from the project numbered 16/SÜF/038 which was financially supported by Ege University Scientific Research Projects Coordination (BAP) (No: 16/SÜF/038).
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Murat Özbek: writing the ms, mapping, calculating the indices, conceptualization, investigation, methodology, and resources. Cem Aygen: conceptualization, funding acquisition, project administration, investigation, methodology, and resources. Ayşe Taşdemir: investigation, methodology, and resources. Seray Yıldız: investigation, methodology, and resources. Esat T. Topkara: investigation, methodology, and resources. Eylem Aydemir Çil: writing the ms, calculating the indices, and methodology.
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Özbek, M., Aygen, C., Taşdemir, A. et al. Determination of the ecological status of an Aegean river (Türkiye) using benthic macroinvertebrates as an indicator of water quality. Environ Monit Assess 195, 1231 (2023). https://doi.org/10.1007/s10661-023-11834-1
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DOI: https://doi.org/10.1007/s10661-023-11834-1