Skip to main content

Table 2 Percentage of successful development of various embryonic stages of H. elegans in control sea water and in different concentrations of phorate in sea water (temp. 28 ± 0.2 °C, salinity 34 ± 0.1°/00, pH 8.1 ± 0.1); n = 6 ± =SD

From: The toxic effects of phorate on early embryonic stages of sedentary polychaete Hydroides elegans (Haswell, 1883)

Developmental stage Control Percentage of successful development
Concentration of phorate in ppm
0.05 0.1 0.25 0.5 1 2 5 10 20 30 40
FM stage 97.63 ± 1.07 94.05 ± 2.07 90.33 ± 4.04 86.67 ± 4.72 83.33 ± 4.93 79.33 ± 6.50 72.67 ± 7.50 58.67 ± 9.07 44.67 ± 10.6 28.67 ± 11.6 15.33 ± 6.65 N.D
2-cell stage 95.00 ± 1.00 88.33 ± 5.68 83.67 ± 8.08 80.67 ± 8.08 77.00 ± 9.53 71.00 ± 6.55 66.00 ± 7.93 53.00 ± 6.24 38.67 ± 11.8 20.33 ± 7.23 3.33 ± 0.57 N.D
3-cell stage 92.67 ± 0.57 86.33 ± 6.42 81.00 ± 7.55 77.67 ± 9.45 72.67 ± 11.3 67.33 ± 10.1 60.67 ± 10.7 49.67 ± 5.13 35.00 ± 13.00 15.67 ± 4.93 N.D N.D
4-cell stage 90.33 ± 1.52 81.33 ± 6.02 76.33 ± 4.72 72.00 ± 4.72 66.33 ± 11.5 61.33 ± 10.2 56.67 ± 10.2 46.33 ± 6.02 31.67 ± 13.5 13.67 ± 4.93 N.D N.D
8-cell stage 80.33 ± 2.51 78.33 ± 5.13 73.00 ± 5.56 68.00 ± 9.16 60.33 ± 10.7 58.67 ± 9.45 54.00 ± 10.1 43.00 ± 7.00 28.33 ± 12.6 11.67 ± 4.93 N.D N.D
16-cell stage 86.33 ± 1.52 75.67 ± 5.68 70.33 ± 7.02 64.67 ± 9.45 58.00 ± 10.5 55.00 ± 8.54 51.00 ± 9.84 40.33 ± 8.02 25.33 ± 13.8 2.67 ± 4.61 N.D N.D
32-cell stage 83.00 ± 1.00 73.00 ± 6.55 67.33 ± 7.63 62.33 ± 10.1 55.67 ± 12.7 52.67 ± 8.08 46.67 ± 5.03 38.00 ± 8.00 22.67 ± 13.6 N.D N.D N.D
64-cell stage 81.33 ± 1.15 70.33 ± 6.80 64.67 ± 7.50 60.33 ± 10.2 53.00 ± 12.7 49.00 ± 7.93 44.67 ± 8.32 35.33 ± 8.73 20.33 ± 13.2 N.D N.D N.D
Blastula stage 79.00 ± 1.00 68.00 ± 7.00 62.00 ± 8.00 56.00 ± 12.2 53.00 ± 12.2 47.33 ± 8.32 42.33 ± 8.73 33.33 ± 10.6 N.D N.D N.D N.D
Blastula start rotation stage 78.00 ± 1.00 64.33 ± 7.76 59.00 ± 9.00 53.67 ± 12.9 50.33 ± 10.9 44.00 ± 8.71 38.00 ± 9.00 29.67 ± 10.6 N.D N.D N.D N.D
Blastula stop rotation stage 78.00 ± 1.00 64.33 ± 7.76 59.00 ± 9.00 53.67 ± 12.9 50.33 ± 10.9 44.00 ± 8.71 38.00 ± 9.00 29.67 ± 10.6 N.D N.D N.D N.D
Release stage 74.00 ± 1.00 60.00 ± 7.21 53.33 ± 9.60 47.67 ± 12.6 43.33 ± 10.2 37.67 ± 10.9 30.00 ± 13.7 21.67 ± 14.3 N.D N.D N.D N.D
  1. N.D no development. Number of eggs/embryos observed in each concentration = 100–150, n = number of experiments