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Speciation
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Biological Species Concept
Population that can interbreed to produce viable and fertile offspring
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Eastern Meadowlark Western Meadowlark
Biological Species Concept
Cannot breed, different songs, different behaviors
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Speciation
Formation of a new species
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How does Speciation occur?
- Gene pools become separated- Populations become reproductively isolated
Reproductive Isolation
Biological barriers that prevent members from producing viable and fertile offspring
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Reproductive Isolation Pre-zygotic (before the zygote)
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Habitat Isolation
2 species, 2 different habitats within same area
Rarely cross paths
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Temporal Isolation
Eastern Spotted Skunk
Western Spotted Skunk
Reproduce late winter
Reproduce late summer
Breed at different times(day/season/year)
Cannot mix gametes
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Behavioral Isolation
Courtship rituals that are uniqueto breeding success
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Mechanical IsolationMorphological
differences that prevent mating
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Gametic Isolation
Purple Sea Urchin Red Sea Urchin
Sperm of #1 not able to fertilize egg of #2Sperm cannot survive, cannot penetrate egg
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Reproductive Isolation Post-zygotic (after the zygote)
Hybrid Equine
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Zebroid or Zorse - sterile
Viable (able to survive)Infertile (not able to reproduce)
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Zedonk, Zebrass - sterile
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Offspring = Mule = sterile
Horse
Donkey
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Offspring = Hinny = sterile
Horse