Abstract
Studies were made on the diurnal periodicity of spore shedding in Ectocarpus mitchellae, Bangiopsis subsimplex and Porphyra vietnamensis. In all three of these marine algae, spore shedding was observed during daytime, and peak shedding of spores occurred between 1000 and 1400 h. Experimental alteration of salinity, exposure to air and light intensity did not change the period of peak spore shedding. Experiments were also conducted to determine optimal environmental conditions (e.g. salinity, desiccation, light intensity) for liberation of plurispores from E. mitchellae, monospores from B. subsimplex and monospores and carpospores from P. vietnamensis growing on the Visakhapatnam coast. In laboratory experiments, 30 to 40 ppt salinity, submergence of fronds and 27 to 44 µE m-2 s-1 light intensity were found to be favourable conditions for the maximum liberation of spores.
Published Version
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