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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. Non-native species ...
Naturalisation (or naturalization) is the ecological phenomenon through which a species, taxon, or population of exotic (as opposed to native) origin integrates into a given ecosystem, becoming capable of reproducing and growing in it, and proceeds to disseminate spontaneously. [1]
A species that occurs naturally in an area; a synonym for native species (Allaby 1998). Injurious species An introduced species that causes economic or environmental harm to humans. Similar terms include aquatic nuisance species, noxious weed, and invasive species (Heutte and Bella 2003).
A native species in a location is not necessarily also endemic to that location. Endemic species are exclusively found in a particular place. [8] A native species may occur in areas other than the one under consideration. The terms endemic and native also do not imply that an organism necessarily first originated or evolved where it is ...
A wild organism (as opposed to a domesticated organism) is known as an introduced species within the regions where it was anthropogenically introduced. [4] If an introduced species causes substantial ecological, environmental, and/or economic damage, it may be regarded more specifically as an invasive species. A native species in a location is ...
Further information can be found at the GB non-native species secretariat, [59] which has a free tool kit of resources on non-native species, including a photo gallery, ID sheets, risk assessments, projects database, case studies and resources for local action groups.
Invasion genetics is the area of study within biology that examines evolutionary processes in the context of biological invasions.Invasion genetics considers how genetic and demographic factors affect the success of a species introduced outside of its native range, and how the mechanisms of evolution, such as natural selection, mutation, and genetic drift, operate in these populations.
These provide nesting grounds for common snakehead, giant snakehead, Indus baril and many species of catfish like rita. The hilsa swims up from the Arabian Sea to spawn in freshwater. Species that are important to people as food, such as the golden mahseer and large freshwater shrimp (Macrobrachium species), are part of the abundant aquatic life.