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Invasive species 10_8 2011


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Invasive species 10_8 2011

  1. 1. INVASIVE SPECIES Stoykov, Sava Smilova, Mihaela Karamihalev, Marin 10/8
  2. 2. What are invasive species? <ul><li>A species that is not native(alien) to an area that causes environmental and/or economic harm when introduced to it. (1) </li></ul>
  3. 3. Are all “alien” species harmful? <ul><li>Not all “alien” species are invasive (2) </li></ul><ul><li>Some can actually be beneficial for their new environment </li></ul><ul><li>Examples: Many agricultural products such as </li></ul><ul><li>-Tomatoes- South America </li></ul><ul><li>-Corn -North America to Europe </li></ul><ul><li>-Many more </li></ul>
  4. 4. What makes an “alien” species invasive? <ul><li>Rapid reproduction (3)- invasive species are generally r-selected </li></ul><ul><li>Toleration to diverse habitat conditions </li></ul><ul><li>Have no natural enemies in the new bioregion they are introduced to </li></ul><ul><li>Highly competitive for resources </li></ul>
  5. 5. What ecological problems do invasive species cause? <ul><li>Displace native species </li></ul><ul><li>Reduce productivity of the bioregion </li></ul><ul><li>Alter processes in the ecosystem </li></ul><ul><li>Introduce new diseases to the region </li></ul>
  6. 6. Economic problems caused by invasive species (4) <ul><li>Mostly problematic for agriculture: </li></ul><ul><li>- harmful to production </li></ul><ul><li>South African lovegrass – destroys pastures in Brazil, damaging cattle industry. </li></ul><ul><li>Losses estimated: $30 million per year </li></ul>
  7. 7. Common Methods of Introduction (5) <ul><li>Intentional introduction </li></ul><ul><li>- releasing “back into the wild” </li></ul><ul><li>Bringing in new species with a set purpose </li></ul><ul><li>Unintentional introduction: </li></ul><ul><li>Usually caused by humans moving from one place to another and bringing different species along </li></ul><ul><li>Often sea and ocean species are transported in the ballast water of ships. </li></ul>
  8. 8. Myocastor coypus aka Nutria (11) <ul><li>A nutria is large, rat-like rodent, which lives near lakes and wetlands. </li></ul><ul><li>It originated in South America, but due to releases from fur farms there are large populations scattered over North America, Europe and Asia. </li></ul><ul><li>Nutria burrow below the banks of rivers and lakes causing them to become unstable. They also feed on young shoots of marsh plants, which tends to lead to erosion in coastal habitats. </li></ul>
  9. 10. Preventing Introduction <ul><li>Most common method-Laws! E.g.quarantine when entering a new country </li></ul><ul><li>Ecological evaluation of </li></ul><ul><li>consequences </li></ul><ul><li>Personal Solutions (6) : </li></ul><ul><li>Gardening: if you don’t know it, don’t grow it! </li></ul><ul><li>Fishing: never from one water source to another! </li></ul><ul><li>Pets: careful what you buy </li></ul><ul><li>Travelling: take care when introducing organic stuff into a new country </li></ul>
  10. 11. After introduction? (7) <ul><li>Eradication!!!- oftentimes costly </li></ul><ul><li>Introducing a natural enemy </li></ul><ul><li>Chemical control </li></ul><ul><li>Mechanical control (by hand) </li></ul><ul><li>Ecosystem management </li></ul>
  11. 12. Works Cited <ul><li>&quot;Definition of Invasive Species.&quot; APHIS Raleigh Plant Protection Center. Web. 05 Dec. 2010. <>. </li></ul><ul><li>Definition, By. &quot;Introduced Species.&quot; Wikipedia, the Free Encyclopedia. Web. 05 Dec. 2010. <>. </li></ul><ul><li>&quot;Invasive Species.&quot; US Forest Service - Caring for the Land and Serving People. Web. 05 Dec. 2010. < </li></ul><ul><li>&quot;Invasive Species - Invasive Species 101.&quot;  The Nature Conservancy - Protecting Nature, Preserving Life . Web. 05 Dec. 2010. <>. </li></ul><ul><li>Wikipedia contributors. &quot;Introduced species.&quot;  Wikipedia, The Free Encyclopedia . Wikipedia, The Free Encyclopedia, 30 Nov. 2010. Web. 5 Dec. 2010. </li></ul><ul><li>&quot;What You Can Do to Prevent Species Invasion.&quot;  Union of Concerned Sientists . 2010. Web. 5 Dec. 2010. <>. </li></ul><ul><li>Simberloff, Daniel. &quot;Introduced Species: The Threat to Biodiversity & What Can Be Done (ActionBioscience).&quot;  ActionBioscience - Promoting Bioscience Literacy . Web. 05 Dec. 2010. <>. </li></ul><ul><li>Web. 12 Dec. 2010. <>. </li></ul><ul><li>&quot;Argentina, Mendoza, Tomato Harvest Stock Photo Image.&quot;  SuperStock - The Best in Stock Photography, Vintage Photos and Fine Art Images . Web. 12 Dec. 2010. <>. </li></ul><ul><li>Southern ACT Catchment Group . Web. 12 Dec. 2010. <>. </li></ul><ul><li>(, International Limited. &quot;Issg Database: Ecology of Myocastor Coypus.&quot; IUCN/SSC Invasive Species Specialist Group (ISSG) . Web. 12 Dec. 2010. <>.-for info </li></ul><ul><li>&quot;Vertebrates of Ribera Norte.&quot;  OoCities - Geocities Archive / Geocities Mirror . Web. 12 Dec. 2010. <>. </li></ul><ul><li>Billionaire’s Wife, By. &quot;2008 « Simply Marvelous.&quot;  Simply Marvelous . Web. 12 Dec. 2010. <>. </li></ul><ul><li>&quot;Is It Cruel to Leave Your Dogs Locked inside a Garage Kennel All Their Life Because You Don't Want Them in Your House?&quot; Questions, Answers, How Tos and Coupons . Web. 12 Dec. 2010. <>. </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>