Figure 4
Natural logarithm response ratios (lnRR) of the single and interactive effects of ultraviolet radiation (UVR), carbon dioxide (CO2), mixing (Mix) and nutrients (Nut) as a function of the photosynthetically active radiation attenuation coefficient (KdPAR, m−1) for the lakes considered in the study. The bars represent the mean of three replicates, and the vertical lines the pooled standard deviation for equal sample size (see “Methods”). The solid and dashed lines represent the fitted polynomial regression lines and the 95% confidence bands, respectively. The values > 0 denote a synergistic effect, and < 0 an antagonistic effect.
