6 30 2011 Free PowerPoint Template from www brainybetty com 1 Definitions • Non Native introduced alien exotic species – Spe by gna72603

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                            Definitions
            • Non-Native/introduced/alien/exotic
              species
              – Species found outside their native range
              – Got there with the help of humans
              – Populations are growing without human
                assistance

            • Invasive Species
              – Introduced species that are causing
                problems ($$$ and biodiversity)

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        What’s the problem?
        Example: Zebra mussels
  • Decrease biodiversity
    – Out-compete and displace
      native species
    – Change ecosystem
              • Change water clarity
            – Concentrate toxins
              • PCB’s




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              Zebra Mussels

            • Economic cost
              – Clog intake pipes
              – Change fish
                communities
              – Estimated cost = $5
                billion over next 10
                years




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                Why are some invasives so
                       successful?

            1. Characteristics of “good” invaders
              – Competitive
              – Reproduce a lot and quickly
              – Grow quickly




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               Why are some invasives so
                      successful?
            2. Enemy escape hypothesis
              – Most invasives are not considered a problem in
                native range
              – Escape natural predators and parasites in new
                range
                 • nothing to keep population in check

            3. Characteristics of the invaded community
              – Disturbed area



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               How do invasives get here?
    • Accidental transport
            – Agriculture/produce
            – Ballast water




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            How do invasives get here?
                 • Intentional introductions
                    – European Starling


  European Starling -
  introduced




                                                                 Eastern Bluebird - native

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                How do invasives get here?
    • Intentional introductions
            – Kudzu




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              How do invasives get here?

            • Landscaping
              – Lantana




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               How do invasives get here?

            • Escape/release
              – Accidental escape
              – People releasing
                unwanted pets
              – Eradication/control of
                other species




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                       Control Measures

            •   Physical removal/hunting
            •   Chemical control
            •   Biological control
            •   Often extremely expensive
            • The best thing to do?
                –Prevent the invasion!!!


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                                     Control Measures

                                             • Physical removal




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                     Control of Fire Ants

            • Chemical control
              – To treat all areas with fire ants
                with pesticide would cost $6 -
                $12 billion per year!

                  • Biological control
                     Decapitating flies
                     Fire ant disease




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            Some Invasive Species in Florida




                                                              Hydrilla

    Africanized/Killer bees




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