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SOME DATA CONCERNING THE DYNAMICS OF ALGINIC ACID AND MANNITOL
IN THE BROWN ALGA CYSTOSEIRA BARBATA 


Maria Mirza
Institut Roumain de Recherches Marines Constanta

Abstract
The determinations of alginic acid and mannitol in the brown alga
Cystoseira barbata, from the Romanian Black Sea coast, from January 
1971 to December 1971, indicate a significant seasonal variation of 
those compounds: there are two annual maxima of alginic acid, 
representing 17% and 21% of dry substance, in April and October,
respectively, and two annual minima representing 8.5% and 21% of dry
substance, in January and July; there are two annual minima of
mannitol, representing 24% and 21% of dry substance, in April and
October, and two annual minima, representing 7.7% and 12% in January 
and August.