Bioassay Correlation

Analyzing the relationship between sediment contaminant concentration levels and percent survival of a benthic species. Seeking advice to best illustrate the data. Thinking concentration is on the x axis (0 at the left) and that the Y axis represents an adverse effect is at the top (100 percent survival would be at the intersection of the x and y axis). Or would it be better to represent it as percent mortality instead of percent survival and make 100 at the top? Is percent mortality and percent survival interchangeable?

many thanks