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Invasive species kendall arthur
The document discusses invasive species and their threats and impacts. It defines invasive species as alien species whose introduction causes economic, environmental, or health harm. Invasive species bring diseases that native species lack immunity against, prey upon native species without natural defenses, compete more efficiently than native species, can hybridize with and eliminate native gene pools through interbreeding, and alter habitats in ways that harm native species. Examples highlighted include the chestnut blight fungus, brown tree snake on Guam, gray squirrels in Europe and Italy, and zebra mussels in North America. The document also asserts that humans are the most invasive species, through activities like industrial pollution, disease spread, habitat destruction including deforestation, overexploitation of resources
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Invasive species kendall arthur
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- 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 speciesbring 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 aremore 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
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- 12. Zebra Mussels Luna PierBeach, Monroe A barge in Twin Cities, County, Michigan Minnesota
- 13. Humans The Most Invasiveof Species
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- 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
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- 19. Habitat Destruction Development of Infrastructure Agriculture Deforestation Waste dumping #1 cause of species extinction
- 20. Habitat Destruction InEurope, >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
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- 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
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- 27. Competition The ultimatecompetitors 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
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- 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
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- 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… Invasivespecies 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 AnimalRights 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:// www.eoearth.org/article/Causes_of_extinction? topic=58074>. Hogan, C Michael. “Deforestation.” Encyclopedia of Earth. 2010. Web. 21 Nov 2011. http://www.eoearth.org/ article/Deforestation?topic=58071 McGinley, Mark. "Invasive species". Encyclopedia of Earth. 2010. Web. 21 Nov 2011. http://www.eoearth.org/article/ Invasive_species?topic=49513.