Fig. 1: Correlation between fish production and temperature 62–46 Ma.

a Observed total ichthyolith accumulation rate (black dots) and paleoceanographic temperature reconstruction derived from δ¹⁸O (red line; ref. ⁴¹). b Nonlinear regression between total ichthyolith accumulation rate and paleoceanographic temperature, binned by half Myr time intervals. Black dots give the half Myr-binned means for total ichthyolith accumulation rate and temperature, solid lines around the dots give the sample standard deviation. The solid black curve gives the mean regression and dashed black curves give the 95% confidence interval for the regression (n = 32). Source data for (b) are provided as a Source Data file.