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Friday, March 15. A film, instead of lecture. Human Impact. EEE 105. Read Ch. 12. http://www.life.uiuc.edu/animalbiology/105/. Name: eee105. Password: prAIRie. Human Impact. Extinction.
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Friday, March 15 A film, instead of lecture
Human Impact EEE 105 Read Ch. 12 http://www.life.uiuc.edu/animalbiology/105/ Name: eee105 Password: prAIRie
Human Impact Extinction Conservationists estimate that the current extinction rate is 1,000 to 10,000 times higher than it should be under natural conditions.
Human Impact Extinction Why? habitat destruction introduced competitors and predators e.g. birds of Guam
Invasive species • Brown Tree Snake introduced to Guam • Has driven 12 bird species extinct
Invasive species • Biotic pollution • Inadvertent human transport
Invasive species • Biotic pollution • Inadvertent human transport • e.g. The Great Lakes
Entered Great Lakes 1921 Sea Lamprey
Sea Lamprey kill > 40 million pounds of fish each year
Human Impact Extinction Why? habitat destruction introduced competitors over-hunting disappearance of N. American megafauna 13,200 years ago
opposable thumb Giant sloth Titanis N. American Megafauna
N. American Megafauna 0verhunting? Clovis people
Human Impact Extinction Why care? indicator species e.g. Northern Spotted Owl
Human Impact Extinction Why care? indicator species valuable genes
Valuable genes • E.g. A new frog species discovered in SE Queensland, Australia in 1973
Valuable genes • Female incubates eggs in her stomach turns off gastric juices for 6 weeks
Valuable genes • If we could find how she does this this could be used in treating ulcers But in 1981, this frog disapperared
Human Impact Extinction Why care? indicator species valuable genes being human
Human Impact Extinction Conservation saving endangered species
30” Human Impact Extinction Conservation saving endangered species Is the Ivory-billed Woodpecker extinct?
Is the Ivory-billed Woodpecker extinct? thought extinct in U.S. in 1950’s found in Cuba in 1970’s but lost there too a reported sighting in 1999 in LA
Ecotourism • E.g. Mountain Gorilla
Whooping cranes Human Impact Extinction Conservation saving endangered species
Adopt an endangered species • Peregrine falcon • bison • bats • lemurs • Zoo animals • gorilla • Web of Life