Impact of near future ocean acidification on the toxicity of the endocrine disruptors, triclosan and clotrimazole

As fossil fuels are burned CO2 is released into the atmosphere. One of the effects of this is ocean acidification which is expected to decrease the average oceanic pH by 0.4 units by 2100. In parallel there is an increase in the levels of anthropogenic substances that could have an harmful effect on the environment. In this study I will focus on two of such substances; clotrimazole and triclosan and their impact in near future ocean conditions using a standardised bio-assay based on adult limb regeneration of an ecologically important marine invertebrate, Amphiura filiformis. Due to their chemical properties the toxicity of triclosan is expected to increase when ocean pH is affected while toxicity of clotrimazole is not. The brittle star A. filiformis was was exposed to increasing concentrations of both clotrimazole and triclosan at pH 8.1 and 7.7. Regeneration and differentiation of lost arms were measured, as well as autotomy. In the clotrimazole treatments no difference between pH was found. In the triclosan treatment there was a difference between the different pH treatments, however the change was not always as expected. This study indicates that the combined effect of pH and toxicants cannot be predicted by only examining the chemical properties of a substance and specific studies are needed in order to evaluate the risk of chemical substances in future oceans.

Röös I., 2011. Impact of near future ocean acidification on the toxicity of the endocrine disruptors, triclosan and clotrimazole. Degree project for Bachelor of Science in Biology, Department of Marine Ecology, University of Gothenburg. 12 pp. Project.


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