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Transcript of Invasive Species
What are invasive or
any organism that exists
somewhere in or near
where it doesn't belong
How does this happen?
"Alien" species may be introduced
to a new ecosystem by:
Prevention is the key
Once a non-native species
gets established, they are
nearly impossible to eliminate.
Efforts are being made around the world
to prevent the relocation of invasive species.
What's the big deal?
Non-native organisms move in.
Plants, animals and microbes from foreign places grow out of control, causing significant economic and biological damage.
swimming or hitching a ride on a log, leaf, or coconut
Most don't survive,
but those that do,
thrive because their
new habitat lacks
to control their
Why do they survive?
They do damage mainly by consuming native species, competing with them for food or space, or
but most commonly
from the release of a ship's ballast water
by releasing an unwanted pet,
One year later,
floating dock washed
up on a beach in Oregon
it was covered with
numerous aquatic species
Northern Pacific seastar
known to be invasive:
Japanese shore crab
Several of these are known to be invasive:
known to be invasive:
On March 11, 2011
Japan was hit with a
9.0 magnitude earthquake
which then triggered a
23 foot tall tsunami.
The waves swept away cars, homes, buildings, a train, and boats.
What can I do?
All types of ecosystems can be effected by invasive species.
The following suggestions apply to land or water ecosystems.
Preventing and containing the
spread of invasive species is vital
to our efforts to protect native plants and animals across our lands, seas and rivers.
community groups designed to restore habitat, survey, remove and report sightings of invasive species.
Teach others that plants, animals and microbes all live as part of a larger system — one cannot be affected without impact on another.
Workers with shovels, rakes and other tools
first scraped the structure clean, then used low-pressure torches to eliminate invasive microbes on the dock.
The Japanese Dock
Each day around 3000 marine
organisms are transported around
the globe in the ballast water of ocean-going vessels. These invaders, along with the ballast water, are dumped at their destination to make way for cargo.
by dumping a bait bucket
overboard, or by forgetting
to wash off a boat before
launching it into a new
body of water
Don't release aquarium fish and plants, live bait or other exotic animals into the wild. If you plan to own an exotic pet, do your research and plan ahead to make sure you can commit to looking after it.
Poisons are effective at eliminating invasive species. Unfortunately, they also kill the native species and disrupt the ecosystem, so they are rarely used.
In Australia they
used traps and divers
to manually collect seastars. They pulled 30,000 sea stars from the Derwent River in 1993 and hardly put a dent in the population.
Manual control efforts must be persistent and several treatments may be needed to reduce or eliminate the target population. If infestations are too pervasive, manual control may become labor intensive and thus not economically feasible.
Early detection of a new invader is crucial for effective control of the spread of the species, and in some cases may even permit eradication.
Biological control refers to the use of animals, fungi or diseases to control invasive populations. Control organisms require a period of study to ensure that they will remain specific to the target population, and will not harm native species.