Abstract
Abstract Carbon fixation in three species of freshwater Rhodophyceae (Batrachospermum boryanum Sirodot, Compsopogon hookeri Mont., and Lemanea annulala Kutz.) has been investigated. Rates of photosynthesis are distinctly influenced by the environmental temperature; while the native Lemanea annulata shows maximum rates in the range of 25°C, the tropical Compsopogon hookeri, which has accidentally been introduced into Central Europe, exhibits highest rates of photosynthesis at about 35°C. Rates of light independent (dark) carbon fixation are negligibly low in all species. From an analysis of the pattern of 14C-labelled photosynthates and the kinetics of 14C-labelling of single photoassimilatory compounds it is concluded that in all freshwater Rhodophyceae the heteroside floridoside (2-O-D-glycerol-α-D-galactopyranose) and the disaccharide trehalose form the most abundant end products of photosynthetic carbon reduction.
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