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Island Biogeography.pptx

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Island Biogeography.pptx

  1. 1. Island Biogeography “Where the Weird Things Are”
  2. 2. • Logistic relationship between habitat size and richness.
  3. 3. Conditions are unusual on islands • Habitat competition is greater • Predators may be absent • Biodiversity is lower • Breeding populations are isolated • As a result of unusual conditions and isolation, islands often develop species which are distinct from the mainland. • Foster’s rule: on a small island with an isolated breeding population, small animals tend to get bigger and large animals tend to get smaller.
  4. 4. Island Gigantism
  5. 5. Giant Moa (New Zealand) • Showed island gigantism • With only eagles as predators and abundant food, Moa evolved to become large, flightless, and fearless of humans • Extinct ~1500AD
  6. 6. Island Dwarfism • Causes are still debated by biologists. Probably linked to limited energy resources on islands. Key deer Shetland pony
  7. 7. Mini-mammoth remains found on Crete Homo floresiensis
  8. 8. Islands are extremely vulnerable to invaders Kakapo MASS KILLER

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