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Fig. 2


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Water transparency in the different periods of land use in the catchment area of Lake Gulbinas (mean values ± SD of measurements in the last ten days of May, August and September). Asterisks indicate significant differences (Kruskal-Wallis test, p ≤ 0.05) in water transparency between two study periods, urban (2007, 2014–2015) and agriculture (1962, 1987–1989).

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