Abstract
SUMMARY Concerning the accumulation of S042- in cells, three types of species are known in the Dictyotales: (i) acidic type (high H2S04 accumulation); (ii) high MgS04 accumulation type; and (iii) nonacidic type (low S042- accumulation). Seasonal changes of intracellular pH and concentrations of inorganic ions were examined in six dictyotalean species. In acidic species (Dictyopteris prolifera (Okamura) Okamura and Spatoglossum eras-sum J. Tanaka), intracellular concentrations of S042- and H+ estimated by pH were high through all seasons. In high MgS04 accumulating species (Dictyotasp. and Padina arborescens Holmes), intracellular concentrations of S042- and Mg2+ were high through all seasons. In nonacidic species (Dictyota dichotoma (Hudson) Lamouroux and Dictyopteris undulata Holmes), intracellular concentration of sulfuric acid ion was low all year round.
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