ArticleOecologia2026
Mesophyll conductance governs photosynthetic performance and water-use efficiency in the matorral of Central Chile.
Article in Oecologia, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mediterranean-type ecosystems occur in five regions worldwide and are characterized by intense summer drought that constrains plant carbon gain and water-use strategies. Along the leaf economics spectrum, herbs typically exhibit higher photosynthetic capacity but lower water-use efficiency than woody species due to greater stomatal (gₛ) and mesophyll conductance (gₘ). However, this expectation may not hold under the particularly arid summer conditions of the central Chilean matorral, where prolonged drought acts as a strong environmental filter on plant water-use strategies. Here, we evaluated photosynthetic capacity, diffusional and biochemical limitations, and intrinsic water-use efficiency (iWUE) in co-occurring herbs, shrubs, and trees. Using combined gas exchange, chlorophyll fluorescence, and carbon isotope composition (δ
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