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Window trap catches of adult chironomids, Tanytarsus gracilentus and Orthocladius oblidens, at Lake Mývatn, Iceland (trap site SN) between the years 1976 and 2000. T. gracilentus (open circles) is bivoltine with two, non-overlapping generations per year; O. oblidens (closed triangles) is univoltine. Redrawn from [111,112].
