Abstract
The effect of three different levels of phosphates and nitrates on temporal variation of structural and functional parameters was studied in algal mat communities in microcosms. The experimental units contained 1 liter of water collected from a farm pond. Microcosms receiving the largest input of nutrients were highest in biomass and pigments, but no greater in net production and respiration than microecosystems receiving an intermediate level of nutrients. These four variables remained low in systems receiving the lowest level of nutrients. The ratio of production to respiration approached unity at all nutrient levels. Production/biomass and production/chlorophyll (i.e., assimilation number) ratios generally decreased with time and leveled off at all nutrient levels. No effects on the pigment diversity ratio, D430/D665 attributable to nutrients were observed.
Published Version
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