Quantifying the sources of pollutants in the Great Barrier Reef catchments and the relative risk to reef ecosystems

► Pollutant loads to the GBR have increased from catchment development. ►Sugarcane is the largest source of anthropogenic dissolved inorganic nitrogen. ► Rangeland beef grazing is the largest source of anthropogenic suspended sediment. ► Sugarcane is the largest source of pesticides to the GBR. ►Regional differences in agricultural land use influence priority pollutant management.