Depletion of heavy isotopes of oxygen and hydrogen in tissue water of intertidal plants: implications for water economy |
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| Authors: | L W Cooper M J DeNiro |
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| Institution: | (1) Department of Earth and Space Sciences, University of California, 90024 Los Angeles, California, USA;(2) Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6038 Oak Ridge, Tennessee, USA;(3) Department of Geological Sciences, University of Tennessee, 37996-1410 Knoxville, Tennessee, USA;(4) Department of Geological Sciences, University of California at Santa Barbara, 93106 Santa Barbara, California, USA |
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| Abstract: | Stable oxygen and hydrogen isotope ratios of leaf and thallus water of the intertidal seagrasses Phyllospadix scouleri and P. torreyi and the marine algae Egregia menziesii, Gelidium coulteri, and Corallina vancouverensis from three locations in California, USA, were determined in 1987. Compared with subtidal seawater, most plant-water samples were depleted in the heavy isotopes 18O and deuterium. Depletion of heavy isotopes was greatest in plants growing at the highest intertidal elevations. This was an unexpected result, because enrichment of heavy isotopes occurs during evapotranspiration in terrestrial plants. Two possible mechanisms for this isotopic depletion are proposed: direct uptake of heavy isotope-depleted water vapor and preferential diffusion of 16O and 1H into littoral plants from water remaining in the intertidal zone at low tide. |
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