Unter Veraicht auf die verwirrende Vielzahl von Gkologischen und anderen Seetypen kiinnen alle Gewtisser der Erdoberfltiche nach dem Umfang der organischen

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Interstitial fluide of sediments, nutrition content of the water and primary production of phytoplankton in lakes. In four lakes of northern Germany (Sch6hsee, Schlu~nsee, Plugsee and Grofler P16ner See) the intensities of photosynthesis are significantly different because of their nutrient reserves, especially in phosphates and nitrates. The nutritional reservoir is represented by the interstitial fluids of the mud; there exists a direct relation between their contents of total phosphorus and ammonium ions and the primary production (phytoplankton/m ~ X 24 hrs) in the euphoric zones. During the summer (1962) the rate of primary production in the four lakes is reduced as phosphates and nitrates are depIeted in the epilimnion. During the discontinuity period (summer 1962) a vertical zonation in the intensity of primary production is maintained with a maximum in the lower epilimnion. This vertical gradient is due to (1) adaptation of algae (especially OsciItatoria and Anabaena species) to low illumination intensities, (2) favorable supply with nutrients. EINLEITUNG

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