Abstract
Between February and October 1977 a study was made of the total chironomid larval population in Wolderwijd, a large, shallow Dutch lake. The main species distribution pattern was, according to substrate and total larval population size, of the same order of magnitude in both substrates. Eutrophication did not cause extraordinarily large chironomid populations to produce excessive numbers of adult midges. The midge plagues experienced in the area are ascribed to the attraction of the midges for artificial light displayed by housing estates in the neighbourhood of the lake.
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