Extended Data Fig. 5: Relationship between average lake depth and average heatwave duration from 1970 to 1999.

For each lake thermal region, the relationship between log₁₀[lake depth (m)] and the average duration of lake heatwave events is shown for the historic period (averaged over all years from 1970 to 1999). The relationships between lake depth and the heatwave metrics (square, not significant: P > 0.001; circle, significant: P < 0.001) were calculated with a generalized additive model (see Methods).