Climate Shapes Elevational Gradients in Concentration, Composition, and Functional Diversity of Willow Metabolomes.

Harsher climate along a 950–2250 m elevational gradient in four willow species increases metabolite concentrations—especially salicinoids—while reducing flavonoid richness and overall structural α-diversity.

• Why it matters: The study addresses how climatic stress versus soil resources and herbivory shape phytochemical diversity, clarifying drivers of metabolome variation relevant to plant ecology and evolution.
• What they did: Across four willow species, researchers measured flavonoids, salicinoids, and primary metabolites along the elevational gradient and tested how climate, soil nutrients, and herbivory relate to concentration and diversity metrics, including α- and β-diversity.
• The result: β-diversity generally increased with elevation and was most strongly associated with climate, while soil nutrients contributed to β-diversity shifts of salicinoids and primary metabolites; weak genetic differentiation suggests limited population divergence.

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