Studies of Diurnal Acid Fluctuations in British Isoetid-type Submerged Aquatic Macrophytes |
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| Authors: | FARMER ANDREW M; SPENCE DAVID H N |
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| Institution: | Department of Plant Biology and Ecology, University of St Andrews Harold Mitchell Building, Greenside Place, St Andrews, Fife KYI6 9AL, UK |
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| Abstract: | British isoetid species are examined for the presence of diurnalfluctuations in tritratable acidity (to pH 6·4), in plantscollected directly from a small lake and in plants grown inconstant conditions in the laboratory. Wide diurnal fluctuationsare present in Isoetes lacustris and in both submerged and terrestrialpopulations of Littorella uniflora. They are absent in Lobeliadortmanna, Subularia aquatica, Eriocaulon septangulare, Ranunculusflammula and Pilularia globulifera. The significance of submerged CAM is discussed in relation toother carbon accumulating mechanisms in isoetids and in considerationof their general ecology. Crassulacean acid metabolism, photosynthesis, isoetid, oligotrophic lakes |
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