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Trees in the flooded forest of the Mapire River in Venezuela suffer a decrease in photosynthetic rate (A) when flood begins, which is reverted at maximum flood. Changes in A are accompanied by similar changes in stomatal conductance (g_s), and the possibility of changes in photosynthetic capacity is not ruled out. In order to understand how relative stomatal and non‐stomatal limitations of photosynthesis are affected by flooding, we studied the seasonal changes in A and its response to intercellular CO₂ concentration in trees of Campsiandra laurifolia, Symmeria paniculata, Acosmium nitens and Eschweilera tenuifolia. Flooding caused in trees of C. laurifolia and S. paniculata a reduction in A, g_s, carboxylation efficiency and total soluble protein (TSP), whereas gas exchange in A. nitens and E. tenuifolia was more sensitive to drought. Under flooding, relative stomatal limitation (L_s) was on average half the …