Rehabilitation of Mytilus edulis larvae abnormalities induced by K2Cr2O7 in short-term experimentsстатья
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Дата последнего поиска статьи во внешних источниках: 25 августа 2021 г.
Аннотация:Mytilus edulis embryo-larval development is often used as a bioassay to evaluate the negative impact of contaminants andenvironmental conditions. The toxicity criteria used in most protocols is the proportions of normal and abnormal larvae. Thevariety of abnormalities were described and classified, but further development of abnormal larvae remains obscure. Thisstudy aimed to reveal the possibility of correction of the morphological abnormalities after short-term exposure (48 h) in avariety of K2Cr2O7 concentrations. For this purpose, abnormal larvae, which developed under the negative influence of theseries of K2Cr2O7 concentrations were transferred into clean seawater and studied after further 24 and 48 h. The obtaineddata, concerning changes in larval morphology, growth and survival rates during washing show that the abnormal larvaehave enough capability to recover the normal D-shell structure. Moreover, restoration of the D-shell is possible even afterexposure with concentration of the toxicant higher than the average effective one. The present research also pointed out thatthe development of larval shell (even abnormal one) is positively correlated with ability of the larvae to reconstruct D-shelland their survival rate. High mortality during washing occurs only at toxicant concentrations when no shell was formedwithin 48 h. Thus, the existence of the shell after 48 h exposure in the toxicant could indicate reversibility of the negativeimpact and help to distinguish the delay in development from its arrest.