Related by context. Frequent words. (Click for all words.) 56 overharvesting 55 sea lampreys 55 cormorants 55 northern spotted owls 54 viral hemorrhagic septicemia 54 deer herds 54 nutrient runoff 54 overfishing pollution 54 overhunting 54 mussel species 53 cormorant 53 Invasive plants 53 nutrient loading 53 Algae blooms 53 bee populations 52 varroa mites 52 Gypsy moths 52 habitat fragmentation 52 wolf populations 52 toxic algae blooms 52 Eurasian milfoil 51 ocean acidity 51 spotted owl habitat 51 Soil erosion 51 invasive species 51 insect populations 51 waterfowl populations 51 freshwater mussels 51 grassland birds 50 Overfishing 50 habitat 50 sagebrush habitat 50 invasive insect 50 predation 50 amphibian populations 50 spiny dogfish 50 grassland habitat 50 aquatic habitats 50 wetland ecosystems 49 red legged frogs 49 gill netting 49 marbled murrelet 49 delta smelt 49 snowshoe hares 49 DNR biologists 49 whirling disease 49 Sea otters 49 freshwater marshes 49 habitat degradation 49 overgrazing 49 aquatic ecosystem 49 mute swan 49 overfishing 49 dissolved oxygen levels 49 salvinia 49 double crested cormorants 49 Severe drought 49 Zebra mussels 49 deplete oxygen 48 timber harvests 48 aquatic habitat 48 National Wildlife Refuges 48 rampant deforestation 48 feral swine 48 populations 48 endangered species protections 48 ash borers 48 Steller sea lions 48 deer herd 48 wetlands 48 species 48 nonpoint source pollution 48 nesting habitat 48 inland waters 48 wetland habitats 48 aquatic ecosystems 48 waterfowl 48 honeybee population 48 Invasive species 48 wetland habitat 48 federally endangered species 48 deer baiting 48 creel limit 48 aquatic weeds 48 Ice jams 48 underwater grasses 48 aquatic species 48 native brook trout 48 terrestrial ecosystems 48 forested wetlands 48 tidal wetlands 48 honeybee colonies 48 mountain caribou 48 Cook Inlet belugas 47 mute swans 47 nutrient pollution 47 migratory waterfowl 47 pallid sturgeon 47 hatchery salmon 47 Biological Opinion 47 round goby