Studies of Diurnal Acid Fluctuations in British Isoetid-type Submerged Aquatic Macrophytes

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Abstract
British isoetid species are examined for the presence of diurnal fluctuations in tritratable acidity (to pH 6·4), in plants collected directly from a small lake and in plants grown in constant conditions in the laboratory. Wide diurnal fluctuations are present in Isoetes lacustris and in both submerged and terrestrial populations of Littorella uniflora. They are absent in Lobelia dortmanna, Subularia aquatica, Eriocaulon septangulare, Ranunculus flammula and Pilularia globulifera. The significance of submerged CAM is discussed in relation to other carbon accumulating mechanisms in isoetids and in consideration of their general ecology.