Fig 4. Population size (number, N) of nematodes as a function of time (days) during exposures to mixtures of metal ions at their respective LC20 (A), and LC5 (B) concentrations.

Data are shown as mean ± standard deviation (number of independent replicates, n = 3). The starting population in all treatments is 10 adult nematodes. The single metal data are included for comparison and are the same as those shown in Fig 2.