Trichoptera have been studied in the drainage basin of the Flavion, a small calcium-ion rich low altitude trout river in Belgium. During a one-year investigation, 45 species, which represent one fourth of the recorded Belgian Trichoptera, have been collected. As a whole, the caddis larvae show a rather weakly defined zonation. Longitudinal distribution of closely related species is discussed from the standpoint of interspecific competition.
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