Abstract
Effects of changes in salinity, pH, and temperature on tetraspores and sporelings ofDictyopteris australis were investigated under laboratory conditions, The spores and sporelings showed a narrow range of tolerance to salinity (30.0‰ to 32.2‰). The spores did not germinate beyond this range. Growth of the sporelings was almost the same at salinities 30.6‰ and 32.2‰, but mortality was higher at 32.2‰. The alga showed a tolerance to pH from 7.5 to 8.4. However, growth of the viable sporelings was maximum at pH 8.2. The optimal temperature for survival and growth of the sporelings of the alga is 23°C. Temperatures above 28°C and below 18°C were found to be highly detrimental.
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