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Sampling sites at the Isar River, Munich: (A,B) 2017 hotspots, main stream of the river (A: 48°07′06.7″ N 11°33′40.3″ E, 48°07′10.1″ N 11°33′43.0″ E; B: 48°06′44.3″ N 11°33′34.3″ E); (C) 2018 hotspot, Isar meadows, Auer Mühlbach (48°06′45.3″ N 11°33′46.5″ E).
