The%20Process%20of%20Speciation

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The Process of Speciation
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What is Speciation?

• The formation of a new species
• Species a group of organisms that can breed with
  one another and produce fertile offspring
• In order to create a different and new species,
  you must change the gene pool
• But, how do you change the gene pool?

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Reproductive Isolation

• To create a new species, there must be isolation
• Reproductive Isolation When members of 2
  populations can no longer interbreed and produce
  fertile offspring now have separate gene pools
• Caused by 3 ways

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Behavioral Isolation

• 2 populations are capable of interbreeding but
  have different courtship rituals
• Bird of Paradise Mating Dance
• Mating Calls/Songs Humpback Whale
• Calls/Whistles of Meadowlark Bird
• http//video.nationalgeographic.com/video/player/a
  nimals/

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Geographic Isolation

• Two populations are separated by geographic
  barriers
• Ex Rivers, Mountains, Bodies of Water
• May not be permanent (waters may flood together,
  land bridge between islands)

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Squirrels and the Grand Canyon
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Reproductive Temporal Isolation

• 2 or more species reproduce at different times
• Ex 3 species of orchids release pollen
• only one day a yr. Since they dont release
• pollen on the same day, they can never
• cross pollinate or interbreed.
• Ex eastern spotted skunk mates in late winter
  and western spotted skunk mates in late summer.

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Pulling It All Together-Darwins Finches
GEOGRAPHIC ISOLATION
CHANGES IN THE GENE POOL
FOUNDERS ARRIVE
REPRODUCTIVE ISOLATION
ECOLOGICAL COMPETITION
CONTINUED EVOLUTION