Related by context. Frequent words. (Click for all words.) 60 coral species 60 ecosystems 59 species 58 coastal ecosystems 58 coral reefs 58 biodiversity hotspots 58 freshwater ecosystems 57 marine ecosystems 57 habitats 56 ocean ecosystems 56 seamounts 56 biodiversity 56 reefs 55 marine biodiversity 55 ecologies 55 forest ecosystems 54 biota 53 habitat 53 mammal species 53 vertebrate species 53 corals 53 watersheds 52 biodiverse 52 Coral reefs 52 amphibian species 52 tidal wetlands 51 marine ecosystem 51 marine habitats 51 biologically diverse 51 marine sanctuaries 51 coral reef 51 freshwater wetlands 51 aquatic ecosystems 51 biosphere 51 freshwater 50 wetland habitats 50 tropical forests 50 intertidal 50 seagrass beds 50 estuaries 50 coral 50 river deltas 49 overexploited 49 invertebrates 49 estuarine 49 mangrove forests 49 freshwater lakes 49 biome 49 benthic 49 ecology 49 bio diversity 49 river basins 48 drylands 48 forests 48 coastal wetlands 48 oceans 48 overfished 48 kelp forests 48 taxa 48 marbled murrelet 48 frog species 48 biosphere reserve 47 mammals 47 ecological 47 fragile ecosystems 47 fragile ecosystem 47 leatherbacks 47 tropical rainforests 47 wetlands 47 bird species 47 underwater grasses 47 marine organisms 47 aquatic species 47 glacial lakes 47 Coral Reefs 47 marine turtles 47 wildlife habitats 47 pikas 47 fauna 47 fisheries 47 tropical rainforest 47 boreal forests 47 aquatic habitat 47 filter feeders 46 wildernesses 46 polar bear populations 46 boreal 46 molluscs 46 species extinctions 46 microclimates 46 lakes 46 glaciers 46 ecosystem 46 organisms 46 frequent droughts 46 tropical forest 46 leatherback turtles 46 landmass 45 flora fauna 45 flora 45 imperiled species