Seasonal stability of sulfuric acid accumulation in the Dictyotales (Phaeophyceae) |
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Authors: | Hideaki Sasaki Akio Murakami Hiroshi Kawai |
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Affiliation: | Kobe University Research Center for Inland Seas, 5-1-1 Fukae, Higashinadaku, Kobe 658-0022, Japan |
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Abstract: | 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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Keywords: | Dictyotales ion chromatography low pH magnesium ion Phaeophyceae sulfuric acid ion |
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