Introduced Insects

Daniel Simberloff

University of Tennessee

An introduced species is a species that did not achieve its current taxonomic status in some location by natural evolutionary processes. Such species are often said to be nonindigenous or adventive to the location of introduction. Among nonindigenous species, those carried to the location by humans, either deliberately or inadvertently, are called "introduced species," whereas those that arrived of their own volition are termed "immigrant." However, all nonindigenous species are often colloquially termed "introduced." "Exotic" and "alien" are sometimes used for all nonindigenous species.

Introduced insects generate major ecological and economic impacts by a variety of means. Many species are introduced in various regions, and they span most insect orders. Their means of introduction are numerous, but most arrive with human help. Only a minority become problematic, and the reasons why a newly arrived species survives or fails to establish a population, and, if established, has or does not have a major effect, are often mysterious. Some problematic introduced species can be eradicated, and several management procedures can adequately control undesirable species when eradication attempts are unsuccessful.

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