Wind distribution of the egg masses of <i>Chironomus anthracinus</i> (Zetterstedt) (Diptera: Chironomidae) in a shallow, wind‐exposed lake (Loch Leven, Kinross)

Abstract

Summary A mass emergence of Chironomus anthracinus (Zetterstedt) took place at Loch Leven, Kinross, in late May and early June 1971, leading to a large concentration of egg masses. The distribution of egg masses within the lake was determined on 6 June 1971 and the accumulation of egg masses along wind‐exposed shores, under the influence of a 17–23 km h −1 wind, was noted. Oviposition site selection by the weak flying adults appears to have little importance upon the final distribution of larvae within the lake. Temporary planktonic activity of first instar larvae under the influence of wind‐induced water currents is briefly discussed as a dispersal mechanism in the light of observed egg mass accumulation in the lake.