Download Invasive Species

Invasive Species
Definition
• An invasive species is any species that is not
native to an ecosystem and whose introduction
does or is likely to cause economic or
environmental harm or harm to human health
• Aquatic invasive species (AIS) is simply an
invasive species which has been introduced into
an aquatic ecosystem, either freshwater or
marine.
Mechanisms of dispersal
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Ballast water
Release of invasive spp. from aquaria
Boat hitch hikers
Fishing (release of live bait)
What are some of the main problems that can be caused when
AIS are introduced?
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Fouling of boats, docks, water intake pipes, fishing equipment, and other objects in the water
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Interference with navigation and water control structures
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Introduction of new diseases
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Competition with and predation of native species
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Reduced water quality (lowered dissolved oxygen levels, increased pH, or decreased light levels for
native species)
Decreased biodiversity in the ecosystem
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Discouragement of recreational boaters, anglers, and tourists from using infested waterways,
impacting local economies
Green crab