Experimente zum Bewegungsverhalten von einzelligen Fliesswasseralgen

1. A schematical model is given of the drifting and recolonisation of algal cells in an artificial channel with algal growth on the bottom when water free of algae was flowing through, as well as of the colonisation of a clean channel by algal cells, when water of a brook was flowing through. Both phenomena are compared with drift and colonisation in a natural channel by means of quantitative sampling.
2. Before settling down again after drifting away a single algal cell may cover a distance of less than 38 m only.
3. Multiple sampling over a period of 24 hours demonstrated diurnal periodicity in the drifting and colonisation of various algal species from running water.