Using different indices to estimate trophic state of a shallow freshwater lake

Authors : Osman Çetinkaya, Cemal Cevher

Pages : 1002-1009

Doi:10.35229/jaes.1782076

View : 81 | Download : 294

Publication Date : 2025-11-30

Article Type : Research Paper

Abstract :The lakes are world’s important aquatic ecosystems and freshwater resources for human, wildlife, irrigation, fisheries, tourism, drinking water, recreation and national park. The over use, increasing anthropogenic pressures and climate change make lakes subject to growing negative impacts. Lakes are experiencing water loss, drying out, degradation and pollution, causing rapid trophic state (TS) rise and eutrophication. The structure, pollution, degradation, usability, and sustainability of lakes are closely linked to their TS. For lake management and conservation; to determine and interpret of TS are need objective, realistic, easily applicable methods. Various TS or level indices have been developed and being applied globally. Kovada is a shallow freshwater lake (Isparta, Turkiye), lake and surroundings were designated as national park. In this study, Kovada Lake and its inlet\\\'s TS were assessed and interpreted on monthly samplings and standard chemical analyses conducted between May and October 2024. Carlson Trophic State Index, New Zealand Trophic Level Index, Türkiye Surface Water Quality Regulation Index and OECD TS criteria were employed. The high TP, TN levels, moderate Chl-a, and low SD were characteristic. According to applied TS indices and criteria lake\\\'s TS is classified as hypertrophic, besides SD measurement difficulties, used indices were appropriate and effective. The canal influences lake\\\'s hydrology, nutrients and TS. Agricultural, domestic and industrial pollutants transported via canal, along with drought-induced water level declines and progressive shallowing, are exacerbating eutrophication.
Keywords : Hipertrofik, Kovada, sığ göl, trofik durum indeksleri, trofik seviye

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