Abstract
In two brooks, at about 1000 m altitude, drift rates were measured at hourly intervals during 48 hours.Hydracarina were day-active with a maximum drift rate coincidently starting with the increasing phase of the sinusoidal water temperature curve. Nymphs ofEphemeroptera andPlecoptera as well as gammarids were night-active with maximum numbers of animals caught that start and end shortly after the greatest changes in light intensity during resp. sunset and sunrise. Analysis of the activity during 48 hours of a drifting ephemeroptean and a non-drifting trochopteran did not reveal a periodical pattern. The results have been discussed. The relationship between periodically occurring increases in drift and activity, with attention to exogenous control and endogenous rhythms, deserves thorough experimental studies.
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