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. 2021 Jan 30;197(4):867–883. doi: 10.1007/s00442-021-04857-3

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — The relative change in a SD (∆SD) and b SI (∆SI) of an evolutionary range of plants in leaves developed in ambient (400 μmol mol⁻¹) and extremely elevated (1500 or 2000 μmol mol⁻¹) [CO₂] in relation to the A_% values of plants grown at ambient [CO₂]. The figure shows the response of cycads (diamond symbol white fill); however, cycads were not included in the regression analysis as cycads do not alter stomatal initiation in response to [CO₂]. Data indicates the results of linear regression analysis. Presented as in Fig. 2 (data from Haworth et al. 2011a, c, 2013, 2015)