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. 2020 Jun 24;287(1929):20200662. doi: 10.1098/rspb.2020.0662

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© 2020 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. — Palaeoenvironmental data. (a) Time series for the percentage of palm pollen (green line and dots) from the Raraku lacustrine record covering the period 1100–1960 CE [21]. (b) SOI reconstruction (SOI_pr), annually resolved (red thin line) and smoothed time series [39]. (c) Relationship between per-capita growth rates and the SPD per unit of palm pollen % for the same period (line fitted by linear regression; y = 0.44 – 2935x, F_1,20 = 97.23, p < 0.0001, r² = 0.82). (d) Relationship between per-capita growth rates and the SPD by the unit of the Southern Index Oscillation for the same period (line fitted by linear regression; y = 0.49–96.25x, F_1,20 = 126.3, p < 0.0001, r² = 0.86). (Online version in colour.)