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2K - Sediment Assays (TUP/141) A Comparison of toxic responsed using micro algae exposed to sediment. DelValls, T.A.1, Robveille, N.2, Casado-Martinez, M.C.1, Moreno, I.3, Lubian, L.3, 1 Departamento de Quimica-Fisica, Facultad de Ciencias del Mar y Ambientales. Universidad de Cadiz, Puerto Real, Cadiz, Spain2 Faculty of science / School of earth science and geography.Kingston University, Kingston upon Thames, Surrey, UK3 Instituto de Ciencias Marinas de Andalucía. Polígono Industrial Río San Pedro, s/n, Puerto Real, Cadiz, Spain ABSTRACT- The anthropogenic impact in ports is a frequently source of pollution that sink on sediment. During the dredging operations necesarry for the ports working, many pollutants are stirred and generate a contamination both in the interstitial water and the sediments. These dissolved pollutants can produce an adverse effect on the organisms such as: micro algae populations ( benthic and pelagic ) which are the basis of the trophic chain playing a key role in marine and coastal ecosystems. The aim of this work is to highlight the toxicity of dredging material on these populations. Thus we preparate elutriate from sediment sample ( Standart Operating Procedure ) in order to simulate the impact of dredging . Two different phases of dredged material were obtained, liquid and solide that were used to expose the micro algae populations. The toxicity of the liquid phase is tested with a pelagic marine algae according to an inhibition test ( ISO reference, International Standard ). The toxixity of solid phase is tested with a benthic marine algae. These bioassays using these populations are useful tool to evaluate the correlation between the toxixity responses obtained from the interstitial water and the sediment Key words: sediment toxicity, phytobentos, elutriate, dredging material |
