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In four lakes of northern Germany (Schöhsee, Schluënsee, Plußsee and Großer Plöner 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/m3×24 hrs) in the euphotic zones. During the summer (1962) the rate of primary production in the four lakes is reduced as phosphates and nitrates are depleted 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 (especiallyOscillatoria andAnabaena species) to low illumination intensities, (2) favorable supply with nutrients.

Interstitial fluide of sediments, nutrition content of the water and primary production of phytoplankton in lakes