Table 2.

Viability (mean, % (standard deviation), n = 4) of Lampsilis siliquoidea glochidia after a 48-h exposure to finasteride or melengestrol acetate (mean measured concentrations^a; mg/L). Effect data in bold are significantly different from controls

			Finasteride concentration (mg/L)
	Control	Solvent control	0.003	0.03	0.3	2.5	23
Finasteride	91 (1.1)	89 (0.7)	90 (2.7)	87 (2.8)	87 (1.5)	88 (2.4)	85 (1.9)b
			Melengestrol acetate concentration (mg/L)
	Control	Solvent control	0.005	0.05	0.3	1.9	4
Melengestrol acetate	91 (1.1)	89 (0.7)	86 (0.2)	82 (2.1)b	85 (1.2)	82 (3.3)b	70 (1.4)c

^aConcentrations were measured at the beginning and end of each exposure (Table S5)

^bAlthough significantly different from pooled controls, this departure represents a 5–8% decrease in survival compared with that of controls, which in light of the 10% acceptable decline in control viability (ASTM 2013), is unlikely to be biologically meaningful

^cSignificant difference from pooled controls