Can noxious weeds displace threatened and endangered species of plants and animals?
Yes. Rare, threatened, and endangered species, such as bulrush, dwarf spikerush, bog turtle, Sacramento thistle, sapphire rockcress, and Colorado butterfly are being displaced by noxious weeds. Can noxious weeds alter the functioning of Riparian (wet land) areas? Yes. This weed lowers water tables and, in some areas, has eliminated surface water and native vegetation needed by wildlife. The noxious weed (tree) saltcedar is drying up ponds and small streams in some areas. Can noxious weeds reduce forage production for livestock and crop production? Yes. Leafy spurge and spotted knapweed can render many range sites useless for cattle production by displacing valuable forage. Grazing capacities for livestock can be reduced 65% to 90% from the original productivity. Currently, weeds cost farmers over $100 million each year in expenses and crop production losses in Montana. Can noxious weeds displace native plant species? Yes. Noxious weeds out compete most native plants for soil nutrients
