Abstract
The apical length growth rates of Fucus spiralis L., Fucus vesiculosus L. and Ascophyllum nodosum (L.) during exposure to air are compared to growth rates during permanent submergence. The growth was measured by a laser diffraction method. For F. spiralis and A. nodosum up to 1-2 h of desiccation enhanced the growth rate significantly. More than 2 h of desiccation reduced the growth rate. Considerable length growth may take place when the algae are exposed to air for short periods.

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