Invasive Species

The spread of invasive species is recognized as one of the major factors contributing to ecosystem change and instability throughout the world. An invasive species is “a non-native species whose introduction does, or is likely to cause, economic or environmental harm or harm to human, animal, or plant health”. Invasive species include all taxa of organisms, ranging from microscopic insects to 100 lb sheep, and can invade any ecosystem, from river beds to lava fields. These species have the ability to displace or eradicate native species, alter fire regimes, damage infrastructure, and threaten human livelihoods. Invasive species are changing the iconic landscapes of our National Parks.

Quick facts on invasive species in National Parks

• Over 6,500 non-native invasive species have been documented on park lands
• 70% of documented invasive species on park lands are invasive plant species
• Around 5% of park lands are dominated by invasive plants