Figure 2 | Scientific Reports

Figure 2

From: Measurements of the swimming speeds of motile microorganisms using object tracking and their correlation with water pollution and rheology levels

Figure 2

Paramecia in the presence of heavy metals. (A) Swimming speed of paramecia in different concentrations of zinc chloride (left). Red circular markers represent the speed immediately after the Paramecia are mixed in the Zinc chloride contaminated sample. Purple triangles and blue squares represent the average swimming speed of Paramecia after 24 and 48 h, respectively. Concentrations are relative to the PL (5 mg/l). The green and orange areas are the average and range of Paramecia speeds in unpolluted (green) and polluted (orange) media. The image on the right side is two characteristic paths followed by the Paramecia for 3 min at PL (light blue) and at five times PL (dark blue). Both are taken immediately after the Paramecia were mixed in the contaminated samples, and it represents the whole field of view. (B) Same representation than (A) but for copper sulfate. Markers use the same color code. PL, in that case, is 2 mg/l. The paths at the right side are for PL (light green) and five times PL (dark green). Error bars represent standard deviation of the average swimming speeds. Statistical significances are analyzed in Supplementary Fig. 2 and cumulative distances in Supplementary Fig. 4.

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