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Development and Application of Aquatic Ecotoxicological Assessment using Indicator Arthropods
The use of aquatic species in ecotoxicity research is well established in developed countries. However there are limitations of using the species that are not native to Korea, and the toxicity data produced by domestic test species are significantly needed to reflect the domestic situation. In this study, the applicability of 3 kinds of native species, Chironomus yoshimatsui Martin et Sublette, Ephemera orientalis McLachlan and Heterocypris incongruens Ramdohr, as aquatic toxicity test species was studied. Also, the integration method of each species response to various industrial effluent and surface water was developed. In ecotoxicological researches using macro invertebrates, temperature is one of the most important toxicity-modifying factors, and temperature effect is species specific. Besides temperature effect, there are other physico-chemical factors that can affect test organisms, such as pH, water hardness and dissolved organic matter. The ideal test species for freshwater quality assessment is very sensitive to various pollutant but resistant to wide ranges of physico-chemical properties of environmental media. Behaviour is the cumulative interaction of a variety of biotic and abiotic factors that represents the animal′s response to internal and external factors and relates one organism to another. So, it is a major mechanism by which animals adapt to changes in their environment, including exposure to contaminants. Despite the importance of behavioral ecotoxicological test, there are few researches to assess the quality of freshwater and its sediment, in part due to the difficulties to obtain detailed quantitative data. This study shows the potentiality of behavioral test for water quality assessment using burrowing behavior of midge species exposed to several heavy metals. Finally, we propose a method which integrates each test into one concise and useful index and can be applied to various field water.
