Abstract
SUMMARYThe effect of irradiance and irradiation time were examined on rates of pseudo‐auxospore formation and the size of initial cells in vegetative cell enlargement of the giant diatom Coscinodiscus wailesii Gran in culture. The mean rate of pseudo‐auxospore formation ranged from 25.9% to 47.8% between experimental incubation conditions. No significant difference was detected in rates among different irradiances and irradiation times, and parent cell sizes. However, the mean valve diameter of the initial cells of the diatom was affected by an interaction between the light conditions and the diameter of the parent cells. Initial cells size tended to be larger with combined conditions of higher irradiance levels and longer irradiation time. There appears to be a relationship (a steady increase, although not a straight line) between the total daily irradiance and the valve diameter of the initial cells. The mean valve diameter of initial cells from larger parent cells was significantly larger than those from smaller parent cells under the same light conditions.
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