Fig. 3
Leaf safety margin (SMleaf; MPa) and xylem safety margin (HSMΨmd-Ψ50; MPa) during a normal (2018) and a severe (2008) dry season. a SMleaf was calculated as the difference between dry season midday leaf water potential (Ψmd) and the water potential at turgor loss point (πtlp; MPa) for, respectively, 28 and 12 canopy-tree species sampled in French Guiana. Species common to both years are identified by hash signs (#). b HSMΨmd-Ψ50 was calculated as the difference between Ψmd and the water potential at 50% loss of branch hydraulic conductivity (Ψ50; MPa) for, respectively, 23 and 12 canopy-tree species sampled in French Guiana. The ranking of species between both years was not retained for SMleaf (τ = 0.5; n = 8; ns) but was retained for HSMΨmd-Ψ50 (τ = 0.71; p < 0.01). Each bar represents the species mean for 2018 (black; n ≥ 3; gray, n < 3) and 2008 (black dashes, n > 3; gray dashes, n < 3) and all error bars represent standard errors of the mean for SMleaf measured in 2018