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The Working Group on Biological Effects of Contaminants (WGBEC) investigates the biological effects of contaminants in the marine environment. The group provides research and increases the understanding of contaminant interactions and effects, including the development of inte-grated biological effects monitoring strategies, which are used to support international research and monitoring. The WGBEC has contributed significantly to the implementation and harmonization of tech-niques that can be used to evaluate the biological effects of pollutants in national monitoring programmes. An overview of national effect-based monitoring programmes of Member States is provided with the aim to support European countries and Regional Seas Conventions on their implementation. A summary of the national effects-based monitoring programmes has been pro-vided by twelve European countries represented at the WGBEC meetings. The adoption of bio-logical effects monitoring can differ widely and comparisons between approaches and the choice of biological effects methods used acts as an important tool. A summary of the main findings is presented. Furthermore, OSPAR's Hazardous Substances and Eutrophication Committee (HASEC) has en-couraged contracting parties to perform targeted biological effects monitoring to enhance the assessment of contaminants in sediment and biota towards the OSPAR QSR2023. WGBEC mem-bers contributed to the integrated biological effects approach assessment by providing data from their national monitoring activities to produce maps and figures to enable interpretations. Revision of the biological effects methods, including new techniques and developments, and the quality assurance of existing methods are core activities for the WGBEC, which require continu-ous discussion and evaluation by the group. Activities include the production of new ICES TIMES documents as well as intercalibration exercises to ensure Member States are providing comparable data for national mon

The Working Group on Biological Effects of Contaminants (WGBEC) investigates the biological effects of contaminants in the marine environment. The group provides research and increases the understanding of contaminant interactions and effects, including the development of inte- grated biological effects monitoring strategies, which are used to support international research and monitoring. The WGBEC has contributed significantly to the implementation and harmonization of tech- niques that can be used to evaluate the biological effects of pollutants in national monitoring programmes. An overview of national effect-based monitoring programmes of Member States is provided with the aim to support European countries and Regional Seas Conventions on their implementation. A summary of the national effects-based monitoring programmes has been pro- vided by twelve European countries represented at the WGBEC meetings. The adoption of bio- logical effects monitoring can differ widely and comparisons between approaches and the choice of biological effects methods used acts as an important tool. A summary of the main findings is presented. Furthermore, OSPAR's Hazardous Substances and Eutrophication Committee (HASEC) has en- couraged contracting parties to perform targeted biological effects monitoring to enhance the assessment of contaminants in sediment and biota towards the OSPAR QSR2023. WGBEC mem- bers contributed to the integrated biological effects approach assessment by providing data from their national monitoring activities to produce maps and figures to enable interpretations. Revision of the biological effects methods, including new techniques and developments, and the quality assurance of existing methods are core activities for the WGBEC, which require continu- ous discussion and evaluation by the group. Activities include the production of new ICES TIMES documents as well as intercalibration exercises to ensure Member States are providing comparable data for natio