Extended Data Fig. 3: Drivers of Phase I biomass dynamics.
From: Community rescue in experimental phytoplankton communities facing severe herbicide pollution
Regression tree model of phytoplankton biomass over the course of Phase I as a function of date, nutrient treatment, and glyphosate and imidacloprid concentrations. Boxplots show the distribution of log-transformed chlorophyll a values in each group. Results (p value) of permutation tests of a correlation between the response and significant predictors are indicated. The tree demonstrates that at dates < 15 days, biomass is negatively affected only in ponds receiving more than 3 mg/L of glyphosate, while after day 15, biomass increases with glyphosate treatment but only in ponds receiving doses > 4 mg/L. This regression tree also shows that the positive effect of the nutrient treatment on biomass is only significant in low-glyphosate ponds, and it confirms that imidacloprid had no discernible effect on phytoplankton biomass.
