328749.fig.002
Figure 2: Cumulative proportion of pairs separated-watercress wash water re-exposures. Solid lines show the mean response for four separate initial exposures. The initial wash water exposure (green) is emboldened for comparison with re-exposures (green-dotted lines) to wash water on 2 separate test occasions; Test WW5r (11 pairs) after exposed test organisms had spent 24 h in clean water, and Test WW2r (20 pairs) after exposed test organisms had spent 48 h in clean water. The mean response of 4 control re-exposures (red) follows a similar pattern to the initial control exposure (red-dotted line shows the mean of 8 control exposures). Vertical bars show standard error; denotes the number of tests.