Comparison of numbers of surviving primiparous daphnids in the predation trials. Each of the three treatments was paired against the others as indicated by the strokes on the x-axis. The left side shows predation trials conducted with T. cancriformis as the predator and the right side shows predation trials where N. glauca served as predator. The error bars indicate standard error of mean. Asterisks indicate statistically significant results; n.s., not significant.