Figure 3 | Scientific Reports

Figure 3

From: Pollen and spores as biological recorders of past ultraviolet irradiance

Figure 3

Statistical analysis of Bosumtwi Poaceae UAC data.

Solid lines are fitted models, dashed lines are 95% confidence intervals. (a) Poaceae UAC concentrations (sample means) plotted against modelled September TSI32. Fitted line is a linear multiple regression model, y = −0.57 + 0.00148*TSI + 0.13*Poaceae proportion, n = 69, r2 = 0.11, p = 0.008. (b) GAM-predicted Poaceae UAC concentrations plotted against modelled September TSI32. Fitted line is a multiple linear regression model, y = −0.52 + 0.00142*TSI + 0.094*Poaceae proportion, n = 69, r2 = 0.34, p < 0.0001. (c) Within-sample UAC standard deviation plotted against the proportion of Poaceae pollen in each sample. Fitted line is a GAM smoother, n = 69, p = 0.01, r2 = 0.13.

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