Related by context. Frequent words. (Click for all words.) 64 algal blooms 64 acidification 62 algae blooms 61 siltation 60 sedimentation 57 salinity 55 silting 54 dissolved oxygen 53 desertification 52 ocean acidification 52 freshwater 52 coral bleaching 52 toxic algae 52 algae bloom 51 upwelling 51 hypoxia 51 estuaries 50 overfishing 50 phytoplankton 49 soil erosion 49 coastal erosion 49 sediment 48 algae 48 marine ecosystems 47 alkalinity 47 anthropogenic 47 ecological 47 cyanobacteria 46 environmental degradation 46 urbanization 46 pollution 46 oxygenation 46 algal 46 turbidity 46 biodiversity 46 atmospheric CO2 46 degradation 46 volcanism 46 diatoms 46 extinctions 46 plankton 45 aquatic species 45 effluents 45 Sediment 45 estuary 44 marine organisms 44 invasive species 44 pollutants 44 mass extinction 44 mass extinctions 44 marine ecosystem 44 sediments 44 overgrazing 44 wetland 44 zebra mussel 44 coastal ecosystems 44 phosphorus 43 pollutant 43 acid rain 43 deforestation 43 atmospheric carbon dioxide 43 tributary 43 invertebrates 43 milfoil 43 ecosystems 43 depletion 43 phosphorous 43 silt 42 Pollution 42 suspended solids 42 watercourse 42 zebra mussels 42 ecology 42 speciation 42 organisms 42 decomposition 42 zooplankton 42 wastewater discharge 42 oxidation 41 Little Ice Age 41 lakes 41 TMDL 41 cormorants 41 sulphate 41 biosphere 41 freshwater fish 41 tributaries 41 ozone depletion 41 Aral Sea 41 glaciers 41 bio diversity 41 rapid urbanization 41 aquaculture 41 glacial ice 40 river basin 40 stormwater runoff 40 seagrass 40 rivers 40 microorganisms 40 wetlands 40 nutrient