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Summer 2006 Workshop in Biology and Multimedia for High School Teachers. MASS EXTICTION & DIVERSIFICATION. Chronology of Mass Extinctions. Five major mass extinctions in the history of the planet. Ordovician-Silurian Late Devonian Permian-Triassic End Triassic

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Presentation Transcript
slide1
Summer 2006 Workshop
  • in Biology and Multimedia
  • for High School Teachers

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

mass extiction diversification
MASS EXTICTION&DIVERSIFICATION

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

chronology of mass extinctions
Chronology of Mass Extinctions
  • Five major mass extinctions in the history of the planet
  • Ordovician-Silurian
  • Late Devonian
  • Permian-Triassic
  • End Triassic
  • Cretaceous-Tertiary

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

slide5

http://www.globalchange.umich.edu/globalchange1/current/lectures/complex_life/complex_life.htmlhttp://www.globalchange.umich.edu/globalchange1/current/lectures/complex_life/complex_life.html

Permission to use image granted by E O Wilson, Harvard University

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

timeline for mass extinctions millions of years ago
Timeline for Mass Extinctions Millions of Years Ago
  • Ordovician-Silurian - 435 mya
  • Late Devonian - 370 mya
  • Permian-Triassic - 240 mya
  • End Triassic - 205 mya
  • Cretaceous-Tertiary - 65 mya

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

organisms affected by massive extinctions
Organisms Affected by Massive Extinctions

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

percentage of species wiped out
Percentage of Species Wiped Out
  • Ordovician-Silurian - 85%
  • Late Devonian - 82%
  • Permian-Triassic - 96%
  • End Triassic - 76%
  • Cretaceous-Tertiary - 76%

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

major indirect causes for mass extinctions
Major Indirect Causes for Mass Extinctions
  • Continental -Flood Basalt Lava (3 of 5)

2. Abrupt Falls in Sea Levels ( 1 of 5)

3. Asteroid Impact (4 of 5)

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

slide10

http://www.firstscience.com/SITE/articles/mac_f2.asp

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

slide11

Diversification and Speciation after Mass ExtinctionsSurviving Species take over vacant habitats and resources Speciation takes every 100 to 100,000 year10 to 10,000 new species per year

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

phylogenetic tree of life
Phylogenetic Tree of Life

http://cmex.ihmc.us/VikingCD/Puzzle/Advanced.html

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

slide14
Is there a potential Sixth Major Extinction?Species are becoming extinct at a rate of about 4000/year100/day1species every 15 minutes

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.

slide15
2050
  • 50% of all species on the planet will be either endangered or extinct
    • Habitat destruction
    • Global Warming
  • 25% mammalian species
  • 15% bird species

Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.