Effects of salinity and cadmium interaction on reproduction and growth during three successive generations ofOphryotrocha labronica (polychaeta)

Abstract

The long-term effects of different cadmium (0.2 and 0.4 ppm} and salinity levels (30, 25, and 20 %0 S} on growth and egg-mass production of Ophryotrocha labronica (La Greca & Bacci} were investigated over three generations. Low salinity levels and the presence of cadmium resulted in reduced growth rates, prolonged times to reach sexual maturity, and reduced size at maturity. Three-way analysis of variance showed significant interaction effects of generation and cadmium for the different growth processes tested. Using response-surface methods, 0.2 ppm cadmium was shown to have a greater effect on growth rate at the third generation than the first and second generations at the three salinities tested. Increased effects were observed from first to second generation at 0.4 ppm cadmium and 30 and 25 ~ S, whereas effects decreased from second to third generation. At 0.4 ppm cadmium and salinity of 20 ~ the first generation was not able to produce viable larvae.

Acute Toxicity of Cadmium on Ophelia bicornis Savigny, 1822

“…Capitella capitata 96 7.5 for adults; 0.22 for trochophore larvae Reish et al, 1976 Capitella capitata 96 0.6-1 Reish et al 1983 Neanthes arenaceodentata 96 12 for adults; 12.5 for juveniles Reish et al, 1976 Neanthes vaali 168 6.4 Ahsanullah, 1976Nereis virens 24,48,96 25, 25, 11 Eisler, 1971 Nereis virens 24,96,168 56, 9.3, 0.7 Eisler and Hennekey 1977 Laeonereis acuta 96 8.2349 Carricavur et al, 2018 Perinereis aibuhitensis 96 0.7934-13.5673 Wang et al, 2008 Ophrgotrocha labronica 48 4 Røed, 1980 The results of the present study in agreement with Reish et al (1976), Eisler and Hennekey (1977), Wang et al (2008) and Carricavur et al (2018) who found similar LC 50 values for 96-hr for the polychaetes C. capitata, Nereis virens, Perinereis aibuhitensis and Laeonereis acuta. In the present study 24 and 48-hrs LC 50 values were also similar to Nereis virens (Eisler, 1971).…”