Fig 2. Boxplots (lower quartile, median and upper quartile, i.e. LC₂₅, LC₅₀ and LC₇₅, respectively) for the eight clonal lineages of D. longispina and for each pair of the four tested metals (copper, zinc, cobalt, and chromium).

Black circles indicate LC₅₀ values and boxes represent the LC₂₅ and LC₇₅ values of each metal for each clonal lineage, after a 48-h exposure. Dashed lines indicate the mean of the set of LC_50,48h for the eight clonal lineages. Solid arrows indicate the safely co-resistant clonal lineages and dashed arrows indicate the critically co-sensitive for each pair of metals.