Abstract
Summary Leaf carbon isotope ratios were measured on dominant deciduous-leaved and evergreen-leaved species in a seasonally dry tropical forest in Venezuela. Carbon isotope ratios were higher and the intercellular to ambient CO 2 concentrations were lower in the deciduous-leaved species. Associated with this are predicted lower water-use efficiencies in evergreen-leaved than in deciduous-leaved species. Predawn water potentials were more positive in evergreen-leaved species, leading to a negative correlation between leaf carbon isotope ratio values and predawn water potential among the different species.
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