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11u bio 04


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11u bio 04

  1. 1. Evidence of Evolution: Biogeography Harriet was a tortoise that Darwin took with him when he left the Galapagos Islands in 1835. She spent most of her life in an Australian zoo until she died in 2006 at the age of 175 years old.
  2. 2. BiogeographyThe study of the geographic distribution of organisms.
  3. 3. BiogeographyClosely related species are usually found in areasthat are geographically close to each other
  4. 4. Biogeography
  5. 5. BiogeographyThe behaviour of different species depends on theirenvironment also. For example, those with nonatural predators will not avoid humans.
  6. 6. BiogeographyWhile researching at the Galapagos Islands, Darwindeveloped several hypotheses for a remote island:
  7. 7. Biogeography1) Only birds, plants, and some reptiles cancross the ocean to get to the island.
  8. 8. Biogeography2) Animals unable to cross the ocean would notbe found on the island.
  9. 9. Biogeography3) Over time the ancestral species would evolveand diversify in isolation.
  10. 10. Biogeography4) These uniquely evolved species are relatedto a species on the nearest continent. These treecreepers are actually 2 different species. Can you see the differences?
  11. 11. How is Biogeography Evidence of Evolution?