Invasive species are organisms (usually transported by humans) which successfully establish themselves in, and then overcome, otherwise intact, pre-existing native ecosystems. Expanding global trade and communication have contributed to the mixing of faunas and floras across biogeographical boundaries. This process, together with habitat destruction, has been a major cause of extinction throughout the world in the past few hundred years.

The scientific investigation of invasive species includes chronicling their spread and impact, but also study of why and how some species are successful invaders.

Biologists are trying to characterize the ability to invade, in the hope that incipient invasions can be predicted and stopped.

Subcategories 4

Related categories 5

Alien Species In Hawaii Information Index
Entry point for information on alien species in Hawaii compiled by the Hawaiian Ecosystems at Risk (HEAR) Project.
Beware of Invasive Species
Document adapted from USA Department of Transportation sources on control of invasive plant species in highway projects.
Big Island Invasive Species Committee
Progress reports and meeting notes from BIISC regarding work in eliminating invasive species from Hawaii, USA.
The Center for Invasive Plant Management
Promotes ecologically based management of invasive plants, with a goal of restoring desired plant communities.
Everglades Cooperative Invasive Species Management Area
Provides information on this formal partnership of federal, state, and local government agencies, individuals and groups that manage invasive species.
Hawaiian Ecosystems at Risk Project
Information about alien species in Hawaiian ecosystems.
Illinois Natural History Program
INHS research projects in invasive species and biological control.
International Programs News
A look at the particular susceptibility of Pacific Island ecosystems to invasive species.
Introduced Species in the UK
A look at the invasive species that have become established in the British Isles over the past three hundred years.
Invasive and Exotic Species of North America
Images and information about insects, weeds, diseases, biological control agents, and other invasive or exotic organisms.
Invasive Species Fact Sheet - Weeds Gone Wild
Describes the impact of invasive plants and aquatic species in the U.S., and Department of the Interior efforts to combat their introduction and spread.
Invasive Species Program - U.S. Fish and Wildlife
The mission of the U.S. Fish and Wildlife Service is working with others to conserve, protect, and enhance fish and wildlife and their habitats for the continuing benefit of the American people.
A comprehensive, online information system that facilitates access to and exchange of invasive species data and resources by researchers, scientists, and concerned citizens. USA only.
IUCN Invasive Species Specialist Group
The ISSG aims to reduce threats to natural ecosystems and the native species they contain - by increasing awareness of invasions, and of ways to prevent, control, or eradicate them.
Maui Invasive Species Committee (MISC)
A voluntary partnership of private, government, and non-profit organizations organized to prevent new pest species from becoming established in Maui County and to stop established pests from spreading wherever possible.
National Invasive Species Information Center
Provides a reference gateway to information, organizations and services about invasive species including federal, state, local and international sources.
Watershed Academy Web - Invasive Non-Native Species
Short primer on invasive species, particularly in aquatic systems, with links to other information. From U.S. EPA.
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