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Map of South-Eastern Europe and the localities of the study sites: Kardzhali (K), Studen Kladenets (SK) and Zhrebchevo (Z) reservoirs, and reference site in Plovdiv (P) in Bulgaria. Geocoordinates of the localities: K – 41.638475 N, 25.304432 E; SK – 41.622244 N, 25.441933 E; Z – 42.585571 N, 25.885592 E; P – 42.164785 N, 24.756515 E.
