Water relations of coastal plant communities near the ocean/freshwater boundary.
Salinity and isotope ratios were determined in water from several wells in the Florida Keys, and tidal inlets. Both D/H and18O/16O ratios of water from wells and tidal inlets were highly correlated to their salinity. Water from standing pools was enriched in deuterium and oxygen-18 relative to their salinity because of evaporation processes.18O/16O and D/H ratios of stem water from plants of several different communities at Sugar Loaf Key, ranging from hardwood hammocks to mangroves, were highly correlated to their predawn water potential. The correlation was consistent with the presence of high salinity in waters with high18O and D content. Most individuals from each community were either utilizing water with isotopic characteristics typical of freshwater or of ocean water, while only a few individuals had stem water with isotopic ratios intermediate to these two water sources.
Department of Biology, University of Miami, 33124, Coral Gables, FL, USA.
Leonel da Silveira Lobo
LD
Sternberg
Department of Biology, University of Miami, 33124, Coral Gables, FL, USA.
Naomi
N
Ish-Shalom-Gordon
National Audubon Society, 115 Indian Mound Trail, 33070, Tavernier, FL, USA.
Michael
M
Ross
National Audubon Society, 115 Indian Mound Trail, 33070, Tavernier, FL, USA.
Joseph
J
O'Brien
Hardwood hammock; Mangrove; Salinity; Stable isotopes; Water potential