Related by context. Frequent words. (Click for all words.) 68 habitat fragmentation 67 overfishing pollution 60 overhunting 59 predation 58 overexploitation 58 overharvesting 56 Overfishing 56 habitat 55 siltation 53 overgrazing 53 grassland birds 53 seagrasses 52 overfishing 52 eutrophication 51 marbled murrelet 51 ecological degradation 50 habitats 50 environmental degradation 50 aquatic habitats 49 extinctions 49 nesting habitat 49 waterbirds 48 aquatic ecosystems 48 species extinctions 48 elephant poaching 48 depredation 48 prolonged droughts 48 biodiversity 48 ungulates 47 Poaching 47 extinction 47 acidification 47 seagrass beds 47 beluga sturgeon 47 species 47 depletion 47 Sage grouse 47 mortalities 47 urbanization 47 Steller sea lions 46 whirling disease 46 Invasive species 46 toxic algae blooms 46 sedimentation 46 coastal ecosystems 46 amphibian species 46 Critically Endangered 46 frequent droughts 46 keystone species 46 Steller sea lion 46 underwater grasses 45 Illegal logging 45 silting 45 aquatic habitat 45 overpopulation 45 Pacific walrus 45 spiny dogfish 45 longline fishing 45 ecosystems 45 owl habitat 45 caribou herd 45 ocean ecosystems 45 nutrient runoff 45 salmonids 45 freshwater ecosystems 44 livestock grazing 44 caribou herds 44 petrels 44 amphibians 44 deforestation 44 thawing permafrost 44 wading birds 44 wetland habitats 44 soil erosion 44 shoaling 44 migratory species 44 leatherbacks 44 wildlife 44 eel grass 44 extirpation 44 aquatic ecosystem 44 glacial melting 44 sawfish 43 lynx habitat 43 freshwater turtles 43 insect populations 43 aquatic insects 43 burrowing owl 43 wildlife habitat 43 ocean acidification 43 migratory patterns 43 federally endangered 43 yellow legged frog 43 harmful algal blooms 43 poaching 43 invasive species 43 subsistence hunting 43 marine ecosystems 43 ecological 43 cormorant 43 woodland caribou