Related by context. Frequent words. (Click for all words.) 63 freshwater habitats 62 freshwater mussels 61 mussel species 60 shortnose sturgeon 60 aquatic habitats 59 coastal estuaries 58 Algae blooms 58 forested wetlands 58 oxbows 58 Methylmercury 57 aquatic invertebrates 57 aquatic ecosystem 57 estuaries 57 freshwater marsh 57 tributary rivers 56 tidal marshes 56 macroinvertebrates 56 deplete oxygen 56 native brook trout 56 saltwater marshes 56 wetland ecosystems 56 Soil erosion 56 rusty crayfish 56 migratory bird populations 56 humpback chub 56 amphipods 55 acidic soils 55 delicate ecosystems 55 phosphorus pollution 55 headwater streams 55 Sea otters 55 tributary streams 55 freshwaters 55 threatened coho salmon 55 phosphorus runoff 55 alkaline soils 54 inland bays 54 PCBs polychlorinated biphenyls 54 seagrasses 54 salinization 54 Stormwater runoff 54 rivers 54 toxic algae blooms 54 phytoplankton blooms 54 Coral bleaching 54 federally endangered 54 Coho salmon 54 Spider mites 54 freshwater ecosystems 54 intersex fish 54 voracious predators 54 Wissahickon Creek 54 hellbender 54 oak hickory 54 peat swamps 53 eelgrass beds 53 cordgrass 53 overharvested 53 Yellowstone cutthroat trout 53 seagrass meadows 53 Sedimentation 53 Turbidity 53 Zebra mussels 53 riparian zones 53 bioaccumulation 53 harmful algae blooms 53 Trumpeter swans 53 streams creeks 53 waterways 53 quaggas 53 plankton blooms 53 aquatic habitat 52 Toxic chemicals 52 clam beds 52 watersheds 52 tributaries 52 groundwater aquifers 52 stonefly 52 soil salinity 52 aquatic ecosystems 52 nutrient runoff 52 river deltas 52 terrestrial ecosystems 52 refugia 52 decaying vegetation 52 deciduous forests 52 marbled murrelets 52 nitrogen deposition 52 headwater 52 intermittent streams 52 double crested cormorant 52 freshwater ponds 52 creeks rivers 52 Kuan Yin Taiwan 52 nonpoint source pollution 52 mainstem 52 nitrate concentrations 52 streambanks 52 salination 51 bowfin 51 sargassum