Mud on the soles of hiking boots or treads of off-road vehicles can contain seeds of noxious weeds. A.gov website belongs to an official government Invasive, nonnative plant species have been a concern of land managers within the temperate and boreal coniferous forest eco-region for nearly a century. Invasive plants have been introduced to the region or U.S. from a different region or country. A subset of these plots are sampled yearly to measure forest ecosystem function, condition, and health, including measurements of native and non-native plants, which can provide information about the spread of invasive species. It has killed millions of trees and had devastating effects on coastal forests in California and Oregon, according to a state task force in California. In many ways, however, tree plagues are surprisingly similar to human ones and these similarities can help us manage both types of threats. Use only invasive-free (weed-free) forage/hay when feeding livestock on National Forests. Temperate forests are some of the most diverse habitats in the world, stretching over multiple climates. Many invasive species, especially those that are aquatic (e.g, invasive tunicates) can be difficult to detect before they pose a large threat. While most of these plants have little environmental effect, some like the Scotch broom, Japanese knotweed, and Armenian (Himalayan) blackberry can escape into natural areas. The hunters moved across the refuge in a massive, coordinated, west-to-east movement. Climate change will likely alter the frequency and intensity of forest disturbances, including wildfires, storms, insect outbreaks, and the occurrence of invasive species. A biological invasion is underway around the globe. For example, in 1949, five cats were brought to Marion Island, a part of South Africa in the southern Indian Ocean. The weight of this water makes the ships stable while they travel across the ocean.