
AbstractUnderstanding how evolutionary history and the coordination between trait trade‐off axes shape the drought tolerance of trees is crucial to predict forest dynamics under climate change. Here, we compiled traits related to drought tolerance and the fast‐slow and stature‐recruitment trade‐off axes in 601 tropical woody species to explore their covariations and phylogenetic signals. We found that xylem resistance to embolism (P50) determines the risk of hydraulic failure, while the functional significance of leaf turgor loss point (TLP) relies on its coordination with water use strategies. P50 and TLP exhibit weak phylogenetic signals and substantial variation within genera. TLP is closely associated with the fast‐slow trait axis: slow species maintain leaf functioning under higher water stress. P50 is associated with both the fast‐slow and stature‐recruitment trait axes: slow and small species exhibit more resistant xylem. Lower leaf phosphorus concentration is associated with more resistant xylem, which suggests a (nutrient and drought) stress‐tolerance syndrome in the tropics. Overall, our results imply that (1) drought tolerance is under strong selective pressure in tropical forests, and TLP and P50 result from the repeated evolutionary adaptation of closely related taxa, and (2) drought tolerance is coordinated with the ecological strategies governing tropical forest demography. These findings provide a physiological basis to interpret the drought‐induced shift toward slow‐growing, smaller, denser‐wooded trees observed in the tropics, with implications for forest restoration programmes.
forest dynamics, 570, demography, [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, F60 - Physiologie et biochimie végétale, Water stress, drought, trait trade-off, Forests, Forest dynamics, geography, [SDV.BV.BOT] Life Sciences [q-bio]/Vegetal Biology/Botanics, water stress, Tree mortality, Xylem, http://aims.fao.org/aos/agrovoc/c_2391, [SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, [SDV.EE.ECO] Life Sciences [q-bio]/Ecology, environment/Ecosystems, http://aims.fao.org/aos/agrovoc/c_14914, Life-history strategies, hydraulic, Phylogeny, sécheresse, Demography, 580, Tropical Climate, Drought, tolérance à la sécheresse, Aquatic Ecology, Phylogenetics and taxonomy, [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, Hydraulic, Wood, Droughts, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, Plant Leaves, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, life-history strategies, tree mortality, Trait trade-off, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, environment/Ecosystems
forest dynamics, 570, demography, [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, F60 - Physiologie et biochimie végétale, Water stress, drought, trait trade-off, Forests, Forest dynamics, geography, [SDV.BV.BOT] Life Sciences [q-bio]/Vegetal Biology/Botanics, water stress, Tree mortality, Xylem, http://aims.fao.org/aos/agrovoc/c_2391, [SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, [SDV.EE.ECO] Life Sciences [q-bio]/Ecology, environment/Ecosystems, http://aims.fao.org/aos/agrovoc/c_14914, Life-history strategies, hydraulic, Phylogeny, sécheresse, Demography, 580, Tropical Climate, Drought, tolérance à la sécheresse, Aquatic Ecology, Phylogenetics and taxonomy, [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, Hydraulic, Wood, Droughts, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, Plant Leaves, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, life-history strategies, tree mortality, Trait trade-off, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, environment/Ecosystems
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