Abstract
The gross primary production of periphyton, grown on artificial substrata in the littoral of the Danube, was measured by the light and dark bottle method from April 1970 to March 1971. The periphyton used for the measurements was sampled from various depths, in order to cover the production of the whole littoral. In connection with this, the littoral area was divided into four zones limited by the heights 600 to 200 cm, according to the local water level gauge. The highest localized zone A (500–600 cm) was inundated only at maximum water levels for rather short period of time, the deepest zone D (200–300 cm) was permanently flooded.
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