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Nitrate (NO3-N) concentrations in offshore waters of Lake Ontario increased by approximately 60% between the 1970s and 2000s, although the drivers are unclear. Here, we show that NO3-N concentrations also increased significantly in at least one season at 13 of 15 large southern Ontario tributaries (8.4 to 2779km2) that drain into Lake Ontario and have no known upstream wastewater treatment plants...
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