Abstract:

The Sücüllü Dam Lake, located in the Middle Mediterranean (Antalya) basin within the borders of the Yalvaç district of Isparta province. It was built in 1973 for irrigation and flood control purposes, later carp was introduced and it was used to rainbow trout cage farming. This study was carried out between May 2017 and April 2018 for determining the trophic status of Sücüllü Dam Lake. Sampling points were determined considering the hydrological conditions, morphology, and use of the Sücüllü Dam Lake. Dissolved oxygen, total phosphorus, Secchi disc depth, chlorophyll-a (Chl-a) measurements, and analyzes were performed in monthly intervals. In the Sücüllü Dam, Lake dissolved oxygen 9.29±0.44 mg/L, Secchi disc depth 1.16±0.09 m, Chl-a 1.85±0.52 μg/L, and total phosphorus 41,14±21,5 μg/L were determined in averages. The parameters varied between sampling stations and months. Sücüllü Dam Lake’s water shows a eutrophic character in terms of total phosphorus and Secchi disc depth while oligotrophic in terms of Chl-a and dissolved oxygen according to the Turkish Regulation of Surface Water Quality Management trophic status index. According to the Carlson Trophic State index, while Chl-a TSI was oligotrophic, Secchi disc depth, total phosphorus, and mean TSI were determined as eutrophic. Possibly surface water that comes from settlement and agricultural areas, and cage fish farming has been affecting the Sücüllü Dam Lake’s trophic state.

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