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Meatrovia 63, P.O.Box 500, 21000 Split, Croatia As the result of increasing urbanization, agricultural activities and industrial development, coastal waters of the Eastern Adriatic (Croatian coast) have been exposed to contamination particularly by organic pollutants. However, the frequency of survey activities in the past decade has been reduced, as the consequence of the warfare in Croatia. Therefore, a biomonitoring of chlorinated pesticides and PCBs, using mussels Mytilus galloprovincialis as very popular and widespread indicator organisms, was performed during 2002-2005 period along the Eastern Adriatic coast. The main objective was to provide information on the present extent and spatial distribution of chlorinated hydrocarbons, in order to determine baseline conditions and evaluate anthropogenic influence in the study area. The general pattern of organic contaminants distribution was characterized by higher PCBs concentrations in relation to chlorinated pesticides, reflecting the prevailing influence of industrial sources of contamination over the agricultural ones. The average value and concentration range was 102 (10.7-287) ng/g dry wt for PCBs in comparison to 10.3 (2.3-25.1) ng/g dry wt for DDTs compounds. Much lower average concentrations were obtained for HCB, lindane, aldrin and dieldrin (0,14; 0.25; 0.84 and 0.75 ng/g dry wt), respectively. Regarding spatial distribution, the elevated contaminant concentration was generally found in mussels collected near urban and/or industrialized centres with high input of industrial, harbour and urban wastewaters. Although not conclusive, no significant temporal decline of the level of contamination by chlorinated hydrocarbons at the Eastern Adriatic coastal area was observed. The comparison of obtained data for PCBs and DDTs compounds in this work with previously published for Mediterranean regions might indicate a lower level of contamination at the investigated area. Moreover, all established concentrations were far bellow the maximum permissible level of chlorinated hydrocarbons in mussels for human consumption, prescribed by the Croatian legislation. However, continued biomonitoring is necessary for reliable assessment of temporal and spatial trends of chlorinated hydrocarbons extent in the coastal waters of the Eastern Adriatic. Such an activity is essential in undertaking measures to minimize pollution in the investigated area with the aim to protect the marine environment and human health. а 6ЧрЕєътєитЭУт]mHnHsH u6]mHnHsH u>*mHnHsH umHnHsH u6mHnHsH u5\mHnHsH u rа dfyz9 : Q R Я а RSАБВГДЕ§§јјјјііёёёёёёёёёёёёёёёёёё$a$$a$Еў0&P 1hА‚. 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