Table 1.

The number of live specimens of the species Pam. experimentalis after each specific day of the experimental period in different magnesium perchlorate concentrations (ER—experimental regimes) and the survivability of the specimens at the end of the experiment.

ER/Days	1	7	14	21	28	35	42	49	56	Survivability
control	24	24	24	23	23	23	21	21	21	87.5%
0.10%	24	23	23	23	23	22	22	22	20	83.3%
0.15%	24	22	17	17	17	16	14	14	14	58.3%
0.20%	24	18	13	9	9	9	7	7	7	29.2%
0.25%	24	16	11	10	7	7	6	6	5	20.8%