Invasive species seth knochel


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  • Chickens - -
  • Not all non-native species are invasive
  • When species are too widespread, they are not longer considered removable, and are simply controlled
  • Good for aquariums because it is so hard to kill
  • Produces toxins in the sap that react with sunlight and can cause skin to blister
  • Invasive species seth knochel

    1. 1. Seth Knochel
    2. 2.  What is an invasive species? What makes them invasive? Why do we care? What is the government doing? Invasives in Texas Invasives in the U.S. Invasives in other parts of the world
    3. 3.  An "invasive species" is defined as a species that is non-native (or alien) to the ecosystem under consideration and whose introduction causes or is likely to cause economic or environmental harm or harm to human health. (Executive Order 13112). Most commonly associated with harm to ecosystem and/or native species Non-native vs. Invasive
    4. 4.  Some intentionally introduced  European Starling introduced as part of a plan to have all the species in the works of Shakespeare in the U.S. Accidental introduction  Fire ants on a ship from South America Bred/introduced with good intentions  Africanized “killer” bees were meant to produce more honey
    5. 5.  Common Traits of Invasive Species  Able to reproduce quickly  Fast maturation rate  Able to disperse quickly  Tolerant to wide range on environments  Tend to be generalists  Able to tolerate some human interaction These traits allow invasive species to outcompete native wildlife
    6. 6.  One species can have a major impact on an ecosystem Niches that are already occupied Preserving native wildlife
    7. 7.  National Invasive Species Council (NISC) was established by Executive Order 13112  February 8th, 1999  Manages invasive species at a national, state, and even ecosystem level  Composed of members 13 federal departments and agencies  Includes the EPA, USDA, USFWS, etc.  Drafts the budget for invasive species  Provide advice for other nations
    8. 8.  Many different methods employed  Some invasive species are only “controlled” while the government attempts to eliminate others  Plants  Herbacides  Manual removal  Animals  Trapping  Birth control  Poisoning  Shooting
    9. 9.  Nutria  Semi-aquatic rodent  Sexually mature at 4 months  Breed year round Introduction  Introduced for the fur trade (CA, WA, OH, MI, OR, LA, NM)  Spread to other states to control undesirable vegetation Threat  Destroys millions of dollars of crops each year  Destroys native aquatic vegetation
    10. 10.  Hydrilla  Aquatic Plant  Very hardy  Can grow 1 inch a day Introduction  Introduced for aquarium trade  Reproduces from stem fragments dispersed by waterfowl Threat  Raises water pH and temperature  Limits number of large fish
    11. 11.  Fire Ants (Red imported fire ant)  Live in large colonies  Able to tolerate wide range on environments  Reproduce very quickly Introduction  On a cargo ship from South America that docked in Alabama Threat  1.2 billion dollars in Texas annually  Damage native plants and animals  Negatively impact red ants/Texas Horned Lizard
    12. 12.  Silver Carp  Asian carp species  Weigh up to 100 lbs.  Move up river 50 miles per year  Reproduce extremely rapidly Introduction  Introduced to Illinois and Mississippi Rivers to help control algae and as a food source Threat  Damage to boats  Outcompete other native species of filter feeders (other carp and mussels)  Feared to eventually become the dominant species in the Great Lakes
    13. 13.  Zebra Mussel  Small mussel at about 3.5-4 cm  High Rate of filtration  Able to tolerate wide range of temperatures Introduction  Thought to have spread from Eurasia to United States by ballast water released from sea-going ships Threat  High rate of filtration lowers amount of green algae  Feed on zooplankton  Increase depth of light penetration
    14. 14.  Ring-necked Pheasant  Well-known game bird in America  Able to tolerate fragmented habitat  Thrives near humans Introduction  Introduced from Georgia to Oregon as a game bird in 1881 Threat  Threat to the Lesser Prairie Chicken  Lekking  Competition for Resources and Habitat
    15. 15.  Brown Tree Snake  Native to Australia, Indonesia, and Papua New Guinea  3 – 6 feet in length  Reproduce year round Introduction  Accidentally introduced in Guam from a cargo ship from the South Pacific Threat  No natural predators on the island  Lead to extinction of the majority of vertebrate species on the island, especially birds  Causes power outages
    16. 16.  Red Fox  5 – 31 lbs  Will consume a wide variety of prey  Listed as one of worlds 100 worst invasive species  Native to Europe, Asia, and North America Introduction  Intentionally introduced to Australia between 1855 and 1871 to control European rabbits Threat  Threat to biodiversity  Major predator of various species of Wallabies, as well as other fauna
    17. 17.  Giant Hogweed  Native to Asia  Can grow to over 18 feet tall  Spreads very quickly Introduction  Brought to Ireland as an ornamental plant for gardens and parks Threat  Health hazard  Able to outcompete native plants by growing rapidly and blocking sunlight  Decreases invertebrate biodiversity by limiting plants that serve as food sources
    18. 18.  Do you think the Government should control invasive species? Do you think humans should be considered an invasive species? Have you ever directly seen the impact of an invasive species?