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While under investigation as a toxicity-testing organism, female gametophytes of the small marine red alga, Champia parvula (C. Agardh) Harvey exhibited a loss of diaphragm formation in indeterminately growing branch tips. Further study revealed that this change of morphology occurred when bromide was omitted from nutrient enriched, synthetic seawater (Thursby and Harlin 1984). The goals of this project were to verify and further document the loss of .diaphragm formation in C. parvula under bromide minus and other culture conditions and to observe developmental events associated with the loss of diaphragm formation. The working hypothesis was that diaphragm formation is dependent on bromide. To test this hypothesis, diaphragm formation in C. parvula branch tips was morphometricly measured by monitoring first segment length (FSL ), the region from the apex to the first observable diaphragm. Overall growth of C. parvula branch tips was monitored by measuring tip length (TL), the distance from the apex to the base of the tip. FSL was selected as an appropriate measure of diaphragm formation by comparing FSL to the increase in segment number in branch tips over time. Tips in synthetic media lacking bromide showed an increase in FSL, but only a small increase in segment number indicating that formation of new diaphragms and, therefore, new segments had stopped. In contrast, branch tips in control treatments showed an increase in segment number but little change in FSLs over time indicating continuous, periodic formation of new diaphragms. The sensitivity of diaphragm formation to bromide availability was observed in both tetrasporophytes and female gametophytes in two versions of synthetic media. However, the two versions of synthetic media with bromide (used as controls)

Morphological Variation of Champia Parvula (C. Agardh) Harvey in Syntheic Medium with Special Attention to the Influence of Bromide