22 Facts About Introduced species

An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally.

Introduced species that become established and spread beyond the place of introduction are considered naturalized.

The process of human-caused introduction is distinguished from biological colonization, in which Introduced species spread to new areas through "natural" means such as storms and rafting.

Adventive species are often considered synonymous with "introduced species", but this term is sometimes applied exclusively to introduced species that are not permanently established.

Immigrant Introduced species are Introduced species that travel, sometimes by themselves, but often with human help, between two habitats.

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Such Introduced species might be termed naturalized, "established", or "wild non-native Introduced species".

Invasive species are those introduced species that spread widely or quickly and cause harm, be that to the environment, human health, other valued resources, or the economy.

Early detection and rapid response is the most effective strategy for regulating a pest Introduced species and reducing economic and environmental impacts of an introduction.

Intentional introductions have been motivated by individuals or groups who either believe that the newly introduced species will be in some way beneficial to humans in its new location or, species are introduced intentionally but with no regard to the potential impact.

Non-native Introduced species can become such a common part of an environment, culture, and even diet that little thought is given to their geographic origin.

Some Introduced species have escaped horticultural control and become invasive.

In other cases, Introduced species have been translocated for reasons of "cultural nostalgia", which refers to instances in which humans who have migrated to new regions have intentionally brought with them familiar organisms.

Introduced species deliberately released eighty starlings into Central Park in New York City in 1890, and another forty in 1891.

Yet another prominent example of an introduced species that became invasive is the European rabbit in Australia.

Special case of introduction is the reintroduction of a Introduced species that has become locally endangered or extinct, done in the interests of conservation.

Introductions or translocations of Introduced species have been proposed in the interest of genetic conservation, which advocates the introduction of new individuals into genetically depauperate populations of endangered or threatened Introduced species.

Over 200 species have been introduced to the San Francisco Bay in this manner making it the most heavily invaded estuary in the world.

For instance, Some 179 coccinellid species have been introduced to the U S and Canada; about 27 of these non-native species have become established, and only a handful can be considered invasive, including the intentionally introduced Harmonia axyridis, multicolored Asian lady beetle.

However the small percentage of introduced species that become invasive can produce profound ecological changes.

Whether an exotic will become an invasive Introduced species is seldom understood in the beginning, and many non-native ornamentals languish in the trade for years before suddenly naturalizing and becoming invasive.

Many introduced species require continued human intervention to survive in the new environment.

In Taiwan, the success of introduced bird species was related to their native range size and body size; larger species with larger native range sizes were found to have larger introduced range sizes.