Abstract
The possible effect of different salinities on the valve morphology of the marine centric diatom Thalassiosira decipiens was investigated. Cultures were grown in media of salinities ranging from 2 to 35%. for 40 days. Only the 15, 20, 25, and 30%. cultures had sufficient growth for statistical analysis of population differences. Areola shape, pattern, and density changed significantly with decreasing salinity. Valves with areola patterns skewed off-centre were more frequent in the lower salinities. Valve diameter also showed a significant decrease. Valves having reduced or missing fultoportulae and rimoportulae were common in the 15 and 20%. cultures.
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