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Invasive species kendall arthur


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  • 1. InvasiveSpeciesBy Kendall Arthur
  • 2. Invasive Species “An alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health…” “ „Alien species‟ means, with respect to a particular ecosystem, any species that is not native to that ecosystem.”
  • 3. Threats Disease Predators Competition Hybridization Habitat alteration  Example: Zebra Muscles
  • 4. Disease Invasive species bring diseases not native to the ecosystem Detrimental to native species with no immunity Example:  Asian chestnut blight fungus  180 million acres of forest destroyed  Moth species living in chestnuts became extinct
  • 5. Predators Reduce population sizes  No evolved defenses Extinction  Example: Brown Tree Snake  Introduced to Guam through ship cargo  Eliminated 10 of 11 species of bird species
  • 6. Competition Invasivespecies are more efficient Native species are not as well adapted Example: North American gray squirrels  Introduced to Great Britain and Italy  Driving native red squirrels to extinction  Forage for nuts more efficiently
  • 7. Hybridization Members of two different species mate and successfully reproduce Invasive species is more abundant Genes “flood” the native species  Forces extinction Genotype of native species phased out  No selection for reproductive isolating mechanisms
  • 8. Habitat Alteration Introduced species alter the ecological make up Cause harm to native species Example: Zebra Mussels
  • 9. Zebra Mussels Brought to U.S. (Great Lakes) from Russia in ballast of ships Filter large amounts of water Reduce densities of planktonic organisms Settle in dense masses over expansive areas 30 freshwater mussel species threatened with extinction by competition
  • 10. Zebra Mussels
  • 11. Zebra Mussels
  • 12. Zebra MusselsLuna Pier Beach, Monroe A barge in Twin Cities, County, Michigan Minnesota
  • 13. HumansThe Most Invasive of Species
  • 14. We Industrialize
  • 15. Pollution Chemical pollutants  Pesticides  SO2, CO, nitrogen oxides Changes metabolism  Chemical imbalances
  • 16. Spread of Disease Bringdiseased animals from one place to another and infect native populations  Bird flu  Swine flu Self invasive species  Spread diseases across human populations
  • 17. Spread of Diseases Hawaiian Islands  Habitat fragmentation  Habitat destruction  Alien species  Diseases
  • 18. We Develop
  • 19. Habitat Destruction Development of  Infrastructure  Agriculture Deforestation Waste dumping #1 cause of species extinction
  • 20. Habitat Destruction In Europe, >85% natural habitat destroyed for agriculture California coastal wetlands shrunk by 90% over 150 years 98% usable agricultural area on Earth already developed
  • 21. Deforestation 48% - Subsistence agriculture in poor countries 32% - Commercial agriculture 14% - Commercial Logging 6% - Charcoal and other fuel wood removal
  • 22. Deforestation
  • 23. Deforestation The Tropical Rainforests  Contain 50% of all 10 million species of plants, animals, and insects  50,000 disappear annually due to deforestation  “Lungs of our planet”
  • 24. Deforestation The Amazon Rainforest  If destroyed, U.S. greenhouse gas emissions would increase 50 fold  90 indigenous tribes destroyed  Loss of…  Medicinal knowledge of plants, trees, and other species  Great economic value if sustained
  • 25. Deforestation
  • 26. We Innovate
  • 27. Competition The ultimate competitors Make our own resources Can outcompete any species Exploiting resources
  • 28. Overexploitation Hunting  Medicine  Clothing  Trophies Overfishing  Shark fin soup outlawed in California Overgrazing  Agriculture
  • 29. But who suffers?
  • 30. Extinction Main reason  Human overpopulation of the earth Extinction rate of species accelerated starting 1600 AD 80% of all extinctions due to habitat destruction by humans
  • 31. One last thing….
  • 32. We suffer We pose a threat to future generations We have negative effect on them, but they have no effect on us Must maintain the earth for the future We are the greatest threats to ourselves
  • 33. In Conclusion… Invasive species are a danger to many different ecosystems Humans are the most invasive species What must be done?  Maintenance  Education  Reforms  Protection of ecosystems
  • 34. Sources"FARM: Farm Animal Rights Movement." The Cost of Disappearing Rainforests. Google Blogger, 14 Oct 2010. Web. 21 Nov. 2011.Hogan, C Michael. ”Causes of Extinction." Encyclopedia of Earth. 2010. Web. 21 Nov 2011. <http:// topic=58074>.Hogan, C Michael. “Deforestation.” Encyclopedia of Earth. 2010. Web. 21 Nov 2011. article/Deforestation?topic=58071McGinley, Mark. "Invasive species". Encyclopedia of Earth. 2010. Web. 21 Nov 2011. Invasive_species?topic=49513.