. 2017 Jan 12;7:40385. doi: 10.1038/srep40385

Table 3. Swimming activities (means ± s.d., n = 5) of Daphnia magna under four norfloxacin concentrations (0, 25, 50 and 100 mg L⁻¹).

Exposure time	Treatment	Time distribution (s)				Swimming velocity (cm/s)
Exposure time	Treatment	Quiescent status	Horizontal move	Upward swimming	Downward swimming	Horizontal move	Upward swimming	Downward swimming
4 hour	0 mg L⁻¹	87.6 ± 46.0^c	188.4 ± 38.0^a	20.6 ± 7.9^a	21.6 ± 6.5^a	0.63 ± 0.08^a	0.47 ± 0.08^a	0.70 ± 0.27^a
	25 mg L⁻¹	118.4 ± 20.6^c	155.6 ± 14.5^a	22.2 ± 8.2^a	19.8 ± 9.5^a	0.71 ± 0.22^a	0.34 ± 0.12^a	0.66 ± 0.27^a
	50 mg L⁻¹	180.8 ± 21.2^b	107.4 ± 21.5^b	22.6 ± 5.9^a	24.8 ± 7.9_a	0.60 ± 0.19^a	0.30 ± 0.07^a	0.52 ± 0.30^a
	100 mg L⁻¹	238.6 ± 21.0^a	56.6 ± 17.9^c	31.0 ± 11.3^a	26.2 ± 7.7^a	0.50 ± 0.12^a	0.27 ± 0.14^a	0.54 ± 0.24^a
12 hour	0 mg L⁻¹	61.4 ± 38.8^c	202.6 ± 17.5^a	28.4 ± 11.7^a	26.6 ± 7.6^a	0.44 ± 0.16^a	0.44 ± 0.23^a	0.55 ± 0.15^a
	25 mg L⁻¹	128.0 ± 35.0^b	148.0 ± 19.0^b	29.8 ± 16.7^a	30.2 ± 13.7^a	0.49 ± 0.10^a	0.49 ± 0.34^a	0.41 ± 0.13^a
	50 mg L⁻¹	196.6 ± 19.7^a	99.4 ± 13.1^c	30.4 ± 7.4^a	31.6 ± 10.2^a	0.49 ± 0.19^a	0.37 ± 0.07^a	0.44 ± 0.30^a
	100 mg L⁻¹	220.6 ± 12.3^a	50.2 ± 13.5^d	32.6 ± 15.7^a	34.2 ± 21.0^a	0.43 ± 0.15^a	0.49 ± 0.28^a	0.41 ± 0.21^a

Different letters indicate significant differences among the four norfloxacin concentrations (P < 0.05).

Table 3. Swimming activities (means ± s.d., n = 5) of Daphnia magna under four norfloxacin concentrations (0, 25, 50 and 100 mg L−1).