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Invasive Species *also called Aquatic Nuisance Species (ANS) The
many descriptive terms for aquatic organisms living beyond their natural
geographic range include "invasive", "introduced",
"non-native", "exotic", "non-indigenous",
"alien", and "aquatic nuisance". Although some introductions
occur naturally, a variety of human-mediated pathways now transport great
numbers of aquatic species long distances in relatively short periods
of time. As a result, species from one continent may find their way past
natural barriers to other continents far removed from their native lands.
Whether deliberately or accidentally introduced through human activity,
these introductions occur globally and all affect local biodiversity.
In some cases, their presence in new habitats may also have serious socioeconomic
or health impacts.
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