2.3 island biogeography

evolution on islands

limited space and resources, creating unique conditions for evolution

adaptive radiation

single species rapidly evolving into several new species to use different resources & reduce competition
ex. Galapagos finches

why do birds beaks evolve

different beaks quickly evolve to fit variety of different food sources on islands

island biogeography

habitat size and richness. species richness increases as the size of the habitat increases

• ex. researchers counted the amount of bird species that inhabited reed islands in Hungary. as island area increased the bird species initially rose quickly and then began to slow.
  

• the Galapagos islands are also another example