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The concerned species are thus: either introduced voluntarily into an ecosystem where they are not native; either accidentally introduced or become feral; or by naturally following human migratory flows by commensalism (eg: arrival of house sparrow in Western Europe following Huns, and previously in Eastern Europe from Asia Minor in Antiquity).
Humans have introduced more different species to new environments than any single document can record. This list is generally for established species with truly wild populations— not kept domestically, that have been seen numerous times, and have breeding populations. While most introduced species can cause a negative impact to new ...
An ecological cascade effect is a series of secondary extinctions that are triggered by the primary extinction of a key species in an ecosystem.Secondary extinctions are likely to occur when the threatened species are: dependent on a few specific food sources, mutualistic (dependent on the key species in some way), or forced to coexist with an invasive species that is introduced to the ecosystem.
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 ...
Introduced species negatively impact ecosystems through altered predator-prey interactions that can cause harm or even local extinction to native species populations (Towns et al.). There are many examples of animal species such as birds, reptiles, and aquatic insects being harmed by the introduction of predators such as rats, cats, and ants.
Oftentimes the introduced species is better equipped to survive and competes with the native species for food or other resources. For example, the strawberry guava tree is one of Hawaii's worst invasive species. It is dangerous because it crowds out native plant species, breaks up natural areas, disrupts native animal communities, alters native ...
Enemy release may be weaker, too, when an exotic species is more closely related to native species in their introduced ranges, making them more likely to share herbivores or pathogens. [22] In a meta-analysis of 19 research studies involving 72 pairs of native and invasive plants, invasive exotic species did not incur less damage than their ...
An invasive species is an introduced species that harms its new environment. [2] Invasive species adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage. The term can also be used for native species that become harmful to their native environment after human alterations to its food web. Since the ...