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Correlations between radial growth and acorn production in five California oak species. Plotted are mean r values ± 95% C.I. between annual radial increment of individual trees in year x and their acorn crops as estimated from visual surveys during the same year (x, Left) and the following year (x + 1, Right). Species, sample sizes, and statistics are as in Fig. 1. **, P < 0.01; ***, P < 0.001; not significant, P > 0.05.
