Related by context. Frequent words. (Click for all words.) 63 nutrient runoff 62 nutrient loading 59 Soil erosion 58 Algae blooms 58 toxic algae blooms 55 nutrient pollution 55 nonpoint source pollution 55 sedimentation 55 algal bloom 55 algal blooms 55 eutrophication 54 harmful algal blooms 54 sewage discharges 53 algae blooms 53 polluted runoff 52 pollution 52 shoreline erosion 52 bioaccumulation 52 salinity 52 ocean acidity 52 deplete oxygen 52 pollutants 51 dissolved oxygen levels 51 saltwater intrusion 51 terrestrial ecosystems 51 estuaries 51 freshwater 51 Sediment 51 sediment 51 soil erosion 50 Melting glaciers 50 inter tidal 50 toxic algae bloom 50 sediment runoff 50 seagrass beds 50 aquatic ecosystem 50 Sediments 49 inland waters 49 basin 49 groundwater recharge 49 salvinia 49 siltation 49 Salinity 49 tidal marshes 49 estuarine 49 PCBs polychlorinated biphenyls 49 waterways 49 stormwater runoff 48 freshwater ecosystems 48 phosphorus 48 fecal contamination 48 acidification 48 shoaling 48 aquatic weeds 48 overfishing pollution 48 dissolved oxygen 48 sewage effluent 48 rotting vegetation 48 pollutant 48 aquifer recharge 48 Severe drought 48 algae bloom 48 tributary streams 48 nitrogen phosphorus 48 Eurasian milfoil 48 biota 48 coastal estuaries 48 watersheds 48 glacial melt 48 sediments 48 marine sediments 48 Didymo 48 groundwater extraction 48 wastewater discharges 48 aquatic habitat 48 sanitary sewer overflows 48 coastal waters 48 phosphorous 47 hydrological cycle 47 species extinctions 47 oxygen depletion 47 toxic algae 47 acidifying 47 lakes 47 aquatic ecosystems 47 groundwater pumping 47 seagrasses 47 aquatic weed 47 dieldrin 47 freshwater mussels 47 microscopic algae 47 Polluted 47 mussel species 47 nearshore waters 47 aquatic organisms 47 algae 47 aquatic vegetation 47 eel grass 47 polluted waterways 47 discharges 47 wetland habitat