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Table 2 The 72-h growth inhibition IC50 and IC10 for algae (R. subcapitata) and 5- and 15-min IC50 for Microtox (V. fischeri)

From: Assessment of stormwater discharge contamination and toxicity for a cold-climate urban landscape

Sampling date

Sampling site name

Algae

Microtox

EC50 (CI 95%)

EC10 (CI 95%)

IC50-5 min (CI 95%)

IC50-15 min (CI 95%)

June 12

SCB E

92.1 (79.9–114)

30.5 (22.0–41.2)

MacPherson Ave

ND

100 (NC)

49.6 (15.6– > 100)

60.8 (18.9– > 100)

17th St. W.

81.9 (73.8–92.1)

31.6 (24.9–40.0)

ND

52.6 (NC)

23rd St. E.

101 (92.5–114)

47.9 (37.9–59.3)

NC

52.3 (NC)

June 20

23rd St. E.

ND

97.7 (33.8–100)

ND

57.6 (NC)

Silverwood Dog Park

ND

58.6 (45.0–71.2)

July 25

SCB E

28.5 (16.3–54.9)

44.8 (28.2–72.3)

MacPherson Ave

ND

76.4 (56.1–88.6)

ND

ND

14th St. E.

79.2 (59.5–98.7)

52.0 (NC)

23rd St. E.

ND

90.7 (26.0–100)

ND

71.3 (NC)

Silverwood Dog Park

109(98.3–127)

35.3 (23.6–44.0)

ND

52.7 (NC)

August 22

SCB W

ND

85.9 (60.8–96.2)

ND

ND (33.92–NC)

MacPherson Ave

95.0 (68.7–180)

16.6 (8.1–30.5)

62.0 (28.5–ND)

60.7 (42.5–NC)

14th St. E.

ND

ND

49.6 (15.6–ND)

60.8 (18.9–ND)

17th St. W.

ND

24.4 (13.1–37.3)

88.2 (69.0–143)

53.9 (NC–59.6)

23rd St. E.

ND

ND

ND

29.6 (19.9–45.3)

Silverwood Dog Park

ND

ND

ND

52.8 (NC)

  1. Results are presented as percent of total sample concentration required to read the endpoint. IC50 and IC10 values were generated using GraphPad Prism as a dose–response curve (see “Methods” section) of, in the case of R. subcapitata, the initial (t = 0) fluorescence observed after 72 h, and in the case of V. fischeri, normalized luminescence as a percent of the negative control
  2. ND no observable toxicity detected at the respective threshold; NC not calculated; sample not tested