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Biodiversity

  Geog 100
What does it mean?
• Biological diversity…
  – Species diversity
  – Genetic diversity
  – Ecosystem diversity
• About 1.4 million species have been described
  by science, est’d. 10 to 15 million on Earth.
• http://tinyurl.com/283be52
• What does “endemic” mean?
Species change over time
• Most species that evolve on Earth eventually
  become extinct as conditions change
• Scientists have identified at least five major
  extinction events over the last 500 million
  years or so, the last one about 65 million years
  ago when 75% of species became extinct,
  including most of the dinosaurs
• Today – a human-caused extinction event?
  About 20% of vertebrates are threatened.
We are losing biodiversity
• Species extinction due to a variety of human
  influences…
• H = Habitat Destruction & Degradation
• I = Introduced and/or Invasive Species
• P = Pollution
• P = Population Growth
• O = Over-consumption
Counting the loss
• Famous human-caused extinctions… dodo,
  passenger pigeon, many island bird species.
• Some of Africa’s animals are on the brink…
  black rhinos, the African wild dog, several
  species of frogs & toads, turtles, and fish.
Dodo birds
Islands
• Island species are especially vulnerable to
  extinction.
• Why?
Hunting passenger pigeons
The last one died in 1914
Species Under Stress
• Threatened species – IUCN Red List
• http://www.iucnredlist.org/
• Video
  http://www.iucnredlist.org/news/evolution-
  lost
Why it matters
• Extinction is forever
• "When we try to pick out anything [in nature]
  by itself, we find it hitched to everything else
  in the Universe.” – John Muir
• Ethical considerations – is destruction
  permissible? Especially unnecessary
  destruction?
2010 was Intl Year of Biodiversity
• http://www.unep.org/iyb/
• Ilcp video… http://vimeo.com/11499468
I=PxAxT
• Impact on ecosystems
• Is a function of all three factors…
  – Population
  – Affluence (consumption)
  – Technology
Protection for endangered species
• How can biodiversity be preserved?
• Saving the black rhino…
• http://www.youtube.com/watch?v=ilF0nU_d0
  CY&feature=player_embedded#!
Biodiversity in RI
• Bioblitz
• http://www.rinhs.org/what-we-do/bioblitz/
• Group research
• Mammals, birds, trees, fish, reptiles &
  amphibians, insects
• Bird video
  http://www.youtube.com/mjgvideo#p/u/2/0Gyn
  sgOJkWg
• Do we have endangered species in RI? Do we
  have invasive species?
Learn more about biodiversity
• E.O. Wilson
• Umich.edu lesson
  http://www.globalchange.umich.edu/globalch
  ange2/current/lectures/biodiversity/biodiversi
  ty.html
• http://www.biodiversityhotspots.org
Next week
• Student reports.

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Biodiversity

  • 2. What does it mean? • Biological diversity… – Species diversity – Genetic diversity – Ecosystem diversity • About 1.4 million species have been described by science, est’d. 10 to 15 million on Earth. • http://tinyurl.com/283be52 • What does “endemic” mean?
  • 3. Species change over time • Most species that evolve on Earth eventually become extinct as conditions change • Scientists have identified at least five major extinction events over the last 500 million years or so, the last one about 65 million years ago when 75% of species became extinct, including most of the dinosaurs • Today – a human-caused extinction event? About 20% of vertebrates are threatened.
  • 4. We are losing biodiversity • Species extinction due to a variety of human influences… • H = Habitat Destruction & Degradation • I = Introduced and/or Invasive Species • P = Pollution • P = Population Growth • O = Over-consumption
  • 5. Counting the loss • Famous human-caused extinctions… dodo, passenger pigeon, many island bird species. • Some of Africa’s animals are on the brink… black rhinos, the African wild dog, several species of frogs & toads, turtles, and fish.
  • 7. Islands • Island species are especially vulnerable to extinction. • Why?
  • 9. The last one died in 1914
  • 10. Species Under Stress • Threatened species – IUCN Red List • http://www.iucnredlist.org/ • Video http://www.iucnredlist.org/news/evolution- lost
  • 11. Why it matters • Extinction is forever • "When we try to pick out anything [in nature] by itself, we find it hitched to everything else in the Universe.” – John Muir • Ethical considerations – is destruction permissible? Especially unnecessary destruction?
  • 12. 2010 was Intl Year of Biodiversity • http://www.unep.org/iyb/ • Ilcp video… http://vimeo.com/11499468
  • 13. I=PxAxT • Impact on ecosystems • Is a function of all three factors… – Population – Affluence (consumption) – Technology
  • 14. Protection for endangered species • How can biodiversity be preserved? • Saving the black rhino… • http://www.youtube.com/watch?v=ilF0nU_d0 CY&feature=player_embedded#!
  • 15. Biodiversity in RI • Bioblitz • http://www.rinhs.org/what-we-do/bioblitz/ • Group research • Mammals, birds, trees, fish, reptiles & amphibians, insects • Bird video http://www.youtube.com/mjgvideo#p/u/2/0Gyn sgOJkWg • Do we have endangered species in RI? Do we have invasive species?
  • 16. Learn more about biodiversity • E.O. Wilson • Umich.edu lesson http://www.globalchange.umich.edu/globalch ange2/current/lectures/biodiversity/biodiversi ty.html • http://www.biodiversityhotspots.org