Related by context. Frequent words. (Click for all words.) 64 coral reefs 63 Coral Reefs 62 marine ecosystems 61 Sea otters 61 reefs 60 coral reef 60 marine ecosystem 59 coral reef ecosystems 57 marine ecology 57 coastal ecosystems 57 Coral reefs 57 dugongs 57 coral 57 seagrasses 56 corals 56 Overfishing 56 leatherback turtle 56 marine biodiversity 56 amphibian populations 55 leatherback turtles 55 reef 55 intertidal 55 marine invertebrates 55 freshwater ecosystems 55 Irrawaddy dolphins 54 seagrass beds 54 coral species 54 ocean ecosystems 54 marine turtles 54 wetland ecosystems 54 aquatic habitats 53 habitats 53 longline fishing 53 sealife 53 Ocean acidification 53 marine 53 petrels 53 Sperm whales 53 overfishing pollution 53 estuarine 53 species 53 coral bleaching 53 intertidal zone 53 migratory habits 52 aquatic invertebrates 52 beached whales 52 Migrating birds 52 terrestrial ecosystems 52 eelgrass beds 52 Sea Turtles 52 aquatic ecosystems 52 biodiversity hotspot 52 Giant squid 52 lowland forests 52 whales dolphins 52 Seagrass 52 Olive Ridley turtles 52 biodiversity 51 sea creatures 51 overexploitation 51 ecosystems 51 plankton blooms 51 gannet 51 Beluga whales 51 monk seal 51 seabirds 51 dolphins whales 51 cuttlefish 51 tidal pools 51 Ningaloo 51 petrel 51 Melting glaciers 51 leatherback 51 freshwater 51 Dugong 51 biodiversity hotspots 51 seals sea lions 50 Galapagos islands 50 Killer whales 50 French Frigate Shoals 50 nesting turtles 50 Seabirds 50 Ozone layer 50 seabeds 50 Soil erosion 50 Leatherbacks 50 endangered turtles 50 harmful algal blooms 50 amphibian species 50 shallow reefs 50 seaweeds 50 kelp forests 50 marine iguanas 50 Mangroves 50 marine mammals 50 ecology 50 Barrier Reef 50 tunicates 50 inter tidal 50 Humpback whales 50 toxic algae blooms