Abstract
SummaryThe vertical distribution of photosynthetic pigments and their degradation products in a north German lake was studied fluorometrically over a period of one year. The maximum chlorophyll concentration was usually in the euphotic zone and at times coincided with that of the phaeo-pigments. Phaeo-pigments maximum was usually in the thermocline, near the base of the euphotic zone. The phaeo-pigments maximum occurred above the portion of the water column where nutrients increased in concentration. Investigations at greater depths revealed that there was a percentage increase in the degradation of chlorophyll with depth. The seasonal cycle of chlorophyll and their degradation products showed a bimodal pattern. Chlorophyll degradation products in the Pluss See constitute a significant fraction of the chlorophylls. From these observations it is concluded that post-lytic photochemical oxidation could be responsible to a large extent for chlorophyll decomposition products in situ in lakes. Chlorophyll derivatives, especially phaeophytins and phaeophorbides, have been detected chromatographically in Pluss See and Gerbiener See.
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