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Trophic and saprobic diatom-based indices are not indicating the same ecological status in a shallow lake, Türkiye

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Abstract

This study aimed to assess the ecological health of a RAMSAR site lake by leveraging diatoms as ecological indicators. Utilizing six trophic and four saprobic indices, we evaluate the lake's ecological status. Monthly samples were collected from five sites between June 2014 and May 2015. Our findings revealed that the lake exhibited hypereutrophic characteristics according to TN and TP concentrations, as well as trophic state indices, except TIDL. Notably, the TIVD index showed a significant correlation with TN and TP, while SISla correlated significantly with TN. Despite the substantial organic matter load, our analysis positioned  the lake at a beta mesosaprobic level with moderate ecological status across three saprobic indices. Interestingly, the annual average dissolved oxygen (DO) concentration classified the lake water as Class I in terms of water quality. The moderate saprobic index values suggest efficient organic matter oxidation, potentially influenced by high DO concentrations in the lake littoral. Our study underscores the importance of integrating trophic and saprobic indices to comprehensively evaluate ecosystem health and ecological status in shallow eutrophic lakes, offering insights into nutrient enrichment and organic pollution load, respectively.

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Acknowledgements

We would like to thank Dr. Enis Akay for his help during field studies and laboratory work. We would also like to thank the 2nd Regional Directorate Republic of Türkiye Ministry of Agriculture and Forestry for their logistic support in the field studies.

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No funding was received for conducting this study.

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All authors contributed to the study conception and design. ND: Methodology, laboratory analyses, diatom identifications, supervision, BZU: Field work, laboratory analyses, diatom identifications. The first draft of the manuscript was written by Nurhayat Dalkıran and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Nurhayat Dalkıran.

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Appendix

Appendix

See Table 7.

Table 7 Diatom species and abbreviations used in CCA analysis

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Dalkıran, N., Zünbülgil-Ünsal, B. Trophic and saprobic diatom-based indices are not indicating the same ecological status in a shallow lake, Türkiye. COMMUNITY ECOLOGY 25, 249–265 (2024). https://doi.org/10.1007/s42974-024-00199-1

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