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Chironomid sampling sites and collection methods. (a) Han River at Ipo weir; (b) Geum River at Sejong weir; (c) Yeongsan River at Seungchon weir; (d) Nakdong River at Danlseong weir; (e) sweeping along Han River at Ipo weir; (f) light-tarping along Yeongsan River at Seungchon weir.
