Before revision:  Over most of the explored parameter space, speciescompeted, but the strength of competition peaked at either low, high  or intermediate switching rates depending on the species' sensitivity to toxins. Importantly , however, the strength of competition in species pairs was a good predictor for how community diversity changed over the switching rate .
After revision:  Over most of the explored parameter space, speciescompeted, but the strength of competition peaked at either low, high or intermediate switching rates depending on both species' ability to withstand the harsh environment. This complex relationship shows why finding patterns between environmental fluctuations and diversity has historically been difficult: response to fluctuations depends on species' properties. In parameter ranges where the fittest species was most likely to be excluded , however, the strength of competition in species pairs was a good predictor for how community diversity changed over the switching rate .