The Occurrence of diel changes in titratable acidity of plant Cell Contents: indications of CAM-like metabolism in plants native to Scotland and comparisons with plants from elsewhere

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Abstract
The low-amplitude diel changes in titratable acidity previously reported for Ascophyllum nodosum (L.) Le Jolis, and in less detail for other members of the Fucaceae, has been confirmed for five intertidal members of the Fucaceae under both submersed and emersed conditions in a light-dark cycle. No significant change was found for five members of the Phaeophyta which normally live completely submerged (Halidrys siliquosa in the family Cystoseiraceae of the Fucales, and four members of the Laminariales). The diel changes in titratable acidity in the Fucaceae are consistent with a very low-amplitude Crassulacean Acid Metabolism in these organisms which can only contribute a few per cent at most to total inorganic C assimilation over a diel cycle. The taxonomic and ecological significance of the findings are discussed in the context of CAM in a world-wide and a Scottish context.