This week, we welcome our own Alexandra McClymont.
Abstract: Extensive road salt use across the Northern Hemisphere is causing long-term and substantial salinization in many freshwater systems, with significant consequences for aquatic organisms and communities. American and Canadian water quality guidelines for chloride are currently based on single-species studies conducted under laboratory conditions, which do not account for community interactions or the effects of additional stressors. Concurrent with salinization, lakes are warming due to climate change. Increasing water temperatures alter lake communities, and could exacerbate the effects of increasing chloride concentrations on aquatic biota. To determine the impacts of these stressors, we conducted a mesocosm experiment using pelagic plankton communities from a lake typical of the Canadian Shield. Our results show that plankton communities will be negatively affected by road salt pollution, even at low chloride concentrations. To ensure the preservation of freshwater systems, Canadian water quality guidelines should be modified to better protect these crucial populations.