Knowra Invasive species Invasive species An invasive species is a nonnative organism that establishes and spreads in a new area, causing or threatening ecological, economic, or human-health harm.
Biological invasion : The movement and establishment of organisms beyond their native ranges, sometimes producing ecological or economic harm. This broader process includes introductions that have not yet caused harm.
Early detection and rapid response : A management approach that finds new invasions early and acts quickly to contain or eradicate them. Intervention is often most feasible before an introduced population spreads widely.
Zebra mussel : A small freshwater mussel native to Eurasia that has invaded waterways in North America and elsewhere. Its rapid spread and attachment to infrastructure exemplify costly aquatic invasion.
Native species : A species occurring in a region through natural range expansion or evolution, rather than human introduction. Native status contrasts with the nonnative origin required for an invasive species.
Biotic homogenization : The increasing similarity of biological communities as distinctive species are lost and widespread species spread. Successful invaders can make once-distinct ecosystems more alike.
Propagule pressure : The number and frequency of individuals introduced to a new area. Repeated arrivals increase the chance that an introduced population will establish.
Invasive species management : The prevention, control, containment, or eradication of harmful nonnative organisms. This field coordinates the tools used to limit ecological, economic, and health damage.
Cane toad : A large toxic toad native to Central and South America, introduced widely for pest control. Its Australian spread illustrates how biological control introductions can become invasive.
Introduced species : A species transported by human activity beyond its natural range into a new area. Many introduced species do not establish, spread, or cause harm, so introduction alone is insufficient.
Island biogeography : The study of how island area and isolation shape species richness and colonization. Island communities often face heightened risks from introduced predators and competitors.
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