Related by context. Frequent words. (Click for all words.) 68 salvinia 66 giant salvinia 65 Hydrilla 63 hydrilla 62 Garlic mustard 60 cordgrass 59 spartina 59 rusty crayfish 59 Zebra mussels 59 Trumpeter swans 59 Didymo 58 mud snail 58 Phragmites 58 freshwater mussels 58 aquatic weeds 58 aquatic vegetation 58 water hyacinth 58 killifish 58 mussel species 58 oxbows 57 Algae blooms 57 Eurasian milfoil 57 perennial herb 57 tunicates 57 invasive insect 56 Gypsy moths 56 Invasive species 56 cypress swamps 56 freshwater marsh 56 Quagga mussels 56 oxalis 56 canadensis 56 Emerald ash borer 56 round gobies 55 alga 55 deciduous forests 55 Milfoil 55 mealybug 55 aquatic weed 55 forested wetlands 55 purple loosestrife 55 freshwater marshes 55 freshwater ponds 55 freshwater lakes 55 cypress swamp 55 species 55 Citrus canker 55 bulrush 55 gastropods 55 quaggas 55 river deltas 54 hemlock woolly adelgid 54 Feral hogs 54 Stink bugs 54 cutworm 54 mullein 54 protozoan 54 Invasive plants 54 upland habitat 54 Sea otters 54 Eurasian watermilfoil 54 baleen whale 54 duckweed 54 mottled duck 54 lowland forests 54 Soybean rust 54 mealybugs 54 Karenia brevis 54 cattail 54 melaleuca 54 dense canopy 54 voracious predators 53 lady slipper 53 leafhoppers 53 loosestrife 53 evergreen foliage 53 biodiversity hotspot 53 sooty mold 53 moth larvae 53 mealy bugs 53 coniferous forests 53 invasive species 53 sea lampreys 53 Poison ivy 53 Migrating birds 53 hackberry 53 lowland forest 53 amphipods 53 freshwater 53 overharvested 53 refugia 53 invasive beetle 53 Rotenone 53 longleaf 53 greenish brown 53 californica 53 tui chub 53 soybean aphid 52 cottonmouth 52 chytridiomycosis 52 leopard frogs