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. 2023 Jun 26;378(1883):20220298. doi: 10.1098/rstb.2022.0298

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© 2023 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Measures of climate relevant to maize productivity, and estimates of declining freedom to relocate through time. (a) Low-frequency estimate of summer temperature derived from pollen [28], relative to modern conditions (preliminary, based on research currently under review). Spatial scope: US Southwest. (b) Inferred low-frequency ENSO phase dominance derived from pollen [28] (preliminary, based on research currently under review). Spatial scope: US Southwest. (c) Proportion of demonstrably occupied cells (having tree-ring dates indicating occupation in the present or any of the previous 3 years) in the maize farming niche [19]. Spatial scope: UUSS as defined in [19]. (d) Room to walk as defined in text. Spatial scope: UUSS as defined in [19]. Series in C and D smoothed using a one-sided moving average of the preceding 11 years. BMII, Basketmaker II; PI, Pueblo I (etc.).