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Global warming is expected to increase runoff and input of organic matter to aquatic ecosystems in large regions of the Northern hemisphere including the Baltic Sea. Research performed at Umeå University and the Swedish University of Agricultural Sciences is now indicating a sevenfold increase in poisonous methylmercury in zooplankton as a consequence. This increase is due to an altered structure of the aquatic food web. The study has been published in the journal Science Advances. “The study has revealed a phenomenon that has not been described before. The results are critical in the prediction of how global climate changes can affect the exposure of methylmercury to ecosystems, and humans,” says Erik Björn, associate professor at Umeå University and leader of the research project.