Table 2:

Increase in LC_50/2 h for further generations of T. pyriformis W expressed as multiples of the LC_50/2 h used in the first exposure to the same toxic substance as in the parental generation

Characteristic	C	OA	DDVP	Cd
Mean	1.02	1.79	1.56	2.69
S.D.	0.03	0.07	0.05	0.10
Maximum	1.10	1.92	1.67	2.84
Upper quartile	1.05	1.86	1.59	2.75
Lower quartile	1.00	1.74	1.52	2.66
Minimum	0.97	1.69	1.48	2.49
Range	0.13	0.23	0.19	0.35
Variation coeff.	0.03	0.04	0.03	0.04
P against C		<0.001	<0.001	<0.001
P against OA	<0.001		<0.001	<0.001
P against DDVP	<0.001	<0.001		<0.001

LC_50/2 h = 50% lethal concentration after 2 h exposure; C = untreated control; OA = exposed to ochratoxin A (3.2 mg/l); DVPP = exposed to dichlorvos (9.6 mg/l); Cd = exposed to cadmium (24 mg/l); n = 10 in all groups. Mean values are inferred from regression lines.