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Invasive Species

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are introduced to a given area outside their original range and. cause harm in their new home. ... South America; accidentally introduced to Alabama in 1930s ... – PowerPoint PPT presentation

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Title: Invasive Species


1
Invasive Species
2
Definition
  • Invasive alien species are plants, animals, or
    other organisms that
  • are introduced to a given area outside their
    original range and
  • cause harm in their new home.

3
  • Because they have no natural enemies to limit
    their reproduction, they usually spread
    rampantly.

4
  • Invasive alien species are recognized as one of
    the leading threats to biodiversity and impose
    enormous costs to agriculture, forestry,
    fisheries, and other human enterprises, as well
    as to human health.

5
  • The cost to control invasive species and the
    damages they inflict upon property and natural
    resources in the U.S. is estimated at 120
    billion annually.
  • Just one invasive species, the Formosan
    subterranean termite, is estimated to do
    500,000,000 in damage in Louisiana annually.

6
How do they get here?
  • Boats, planes, accidental or intentional release

7
Invasive Species in Louisiana A Quick Look
  • Louisiana has been invaded by a number of harmful
    exotic plants and animals. Here is a quick look
    at
  • some of the worst current and potential invaders

8
Zebra Mussel
  • Mollusk
  • Originated Caspian Sea (region of Asia)
    accidentally released into Lake St. Clair in 1988
    in ship ballast water
  • Found in Mississippi through its entire length in
    LA

9
Damage
  • Voracious filter feeders that out-compete native
    animals fouls boats clogs intake pipes at
    power plants and municipal water sources

10
Nutria
  • Mammal
  • Originated South America escaped captivity
    in1930s after attempt at ranching for fur
  • Occur through much of coastal LA TX, and
    elsewhere.

11
Damage
  • Damage sugarcane and rice fields, and cause major
    damage to coastal marshlands, which are important
    for flood control and wildlife

12
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13
Fire Ant
  • Insect
  • Originated South America accidentally
    introduced to Alabama in 1930s
  • 300 million acres of Southern U.S., including all
    of Louisiana!

14
Damage
  • Aggressive, multiple biter with painful venom and
    chance of allergy may also damage electrical
    boxes, fruits, berries and young crops ant
    mounds are a hazard to farm equipment.

15
Formosan Subterranean Termite
  • Insect
  • Originated China and Japan ships returning from
    WWII probably brought it to U.S. coastal cities.
  • Found in 11 states, including most of southern
    Louisiana.

16
Damage
  • These termites live in enormous colonies and eat
    all kinds of wood trees, telephone poles, and
    homes. Considered a huge threat to New Orleans
    historic buildings.

17
What is being done?
  • Trapping and extermination
  • Task forces established at ports
  • Limiting ballast releasing
  • Regulations on pet trade

18
The Pet Trade
  • Many invasive species are the result of
    irresponsible pet ownership!!
  • Escaped/ released
  • Aquaria dumping, water gardens

19
  • Biologist Skip Snow handles a python captured in
    Florida's Everglades National Park. He says the
    snakes are a threat to five endangered species.

20
  • Though they're often kept as pets, Nile monitor
    lizards have gone wild in Cape Coral, Fla.,
    threatening local species.

21
Snakeheads Story
  • 28 species
  • 25 from eastern Asia, 3 from Africa
  • ability to breathe air and live out of water for
    days
  • Snakehead can breathe with both their gills and a
    lung-like organ that, in fact, requires them to
    breathe (or gulp) air at the water's surface
    otherwise they will drown.
  • Reach 80 cm!!

22
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23
  • Bought for aquariums or consumption,
    accidentally/intentionally released in our
    waterways
  • Now found in California, Florida, Hawaii, Maine,
    Massachusetts, Rhode Island and Maryland
  • voracious predators and with no known natural
    enemies 
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