engleski

Adaptation of snail Planorbarius corneus L. on calcium-chloride and calcium-bromide solutions

IN INA-Naftaplin laboratory, the extensive investigations on "heavy brines", which are used in oil industry as concentrated solutions of CaCl2 (481.3 gdm-3), CaBr2 (1065.9 gdm-3) and their 1:1 mixture, have been carried out. In this study, the effect of several concentrarions of heavy brines' water solutions to the fecundity and mortality of the second generation of fresh-water snail Planorbarius corneus L., hatched and raised in the same concentrations, was observed. The attempt was made to establish whether the permanent presence of various heavy brines' concentrations in stagnant water increases the toleration threshold to the chemicals, or their adverse effect in the second generation is stronger. The results suggest, that there is a possibility of adaptation of the population of snails permanently exposed to the diluted heavy brines' in stagnant water, since in higher concentrations of tested chemicals (CaCl2 1%, CaBr2 0.5% and the mixture CaCl2/CaBr2 1:1 0.5%) the differences in eff-masses production and in mortality rates between the first and the second generation of snails were significantly expressed (P -0.05).

nije evidentirano

nije evidentirano