Related by context. Frequent words. (Click for all words.) 72 algal blooms 69 algae blooms 60 toxic algae 59 coral bleaching 59 nutrient pollution 58 algae bloom 57 oxygen depletion 57 ocean acidification 57 salinity 57 cyanobacteria 56 aquatic ecosystems 56 algae 56 marine organisms 55 coastal ecosystems 55 dissolved oxygen 54 estuaries 54 acidification 54 marine ecosystems 54 eutrophication 54 phytoplankton 53 estuarine 53 aquatic organisms 53 aquatic species 52 polluted runoff 52 eelgrass 52 hypoxia 51 coral reefs 51 marine ecosystem 50 reefs 50 marine habitats 49 ocean ecosystems 49 shellfish beds 49 invasive species 49 domoic acid 49 algal 48 corals 48 marine biodiversity 48 bioluminescence 48 oceans 48 upwelling 48 coastal erosion 48 atmospheric circulation 48 plankton 48 leatherbacks 48 diatoms 48 sedimentation 48 Estuary Program 48 hydrilla 47 turbidity 47 freshwater 47 Overfishing 47 mass extinctions 47 aquatic vegetation 47 Invasive species 47 zooplankton 47 ozone depletion 47 horseshoe crabs 47 organisms 47 invertebrates 47 freshwater lakes 47 salt marshes 46 seaweeds 46 zebra mussel 46 oyster reefs 46 endocrine disruptors 46 marine mammals 46 fecal bacteria 46 ocean currents 46 El Niño 45 sewage overflows 45 sewer overflows 45 estuary 45 aerosols 45 sediments 45 coastal waters 45 Algae 45 seabirds 45 methylmercury 45 overfishing 45 hydrothermal vents 45 milfoil 45 manatees 45 oceanic 45 shellfish 45 atmospheric carbon dioxide 45 ocean 45 zebra mussels 45 jellyfish 45 soil erosion 44 shorelines 44 pollutants 44 Zebra mussels 44 sea turtles 44 seagrass 44 sulfates 44 shorebirds 44 El Nino 44 sediment 44 ecosystems 44 Coral reefs 44 siltation