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Introducing a species can have both positive and negative impacts. The positive impacts include increased food production, economic impacts, and species habitat. The negative impacts include mixing of genes, habitat modifications, competition with native species, and pathogen introduction.
Killing potentially large numbers of animals seems counterintuitive to conservation. But more and more evidence has shown that removal of invasive species from threatened ecosystems is not only effective at restoring endangered habitats and species, but necessary.
Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. The invasive species may provide little to no food value for wildlife. Invasive species can also alter the abundance or diversity of species that are important habitat for native wildlife.
Introduced species that have profound effects on their new ecosystems have been termed invasive species. These effects include outcompeting native species, sometimes causing their extinction, and altering ecosystem functioning.
Sometimes species that don’t occur naturally in a habitat are deliberately introduced by humans for conservation efforts, population control of native species, or for boosting agriculture and fisheries.
The environment is suitable for them and they have adapted to the area. Introducing a new species can also introduce any diseases that species has. These new diseases can spread to other native species and negatively affect them.
An exotic or alien species is one that has been introduced to a new place, but does not necessarily have negative consequences. For example, many fish species have been introduced into the Great Lakes for sport fishing. 2 They have no documented negative impacts and provide recreational opportunities and a food source.