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MACROEVOLUTION - Speciation

MACROEVOLUTION - Speciation. The evolution of a new, separate species. BioH Ch 17. Considerations. Reproductive Isolation Mechanisms. Pre Zygotic Behavioral Temporal Mechanical. More Pre-Zygotic Reproductive Isolation Mechanisms. Ecological Gametic mortality Habitat (most common).

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MACROEVOLUTION - Speciation

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  1. MACROEVOLUTION - Speciation The evolution of a new, separate species BioH Ch 17

  2. Considerations

  3. Reproductive Isolation Mechanisms • Pre Zygotic • Behavioral • Temporal • Mechanical

  4. More Pre-Zygotic Reproductive Isolation Mechanisms • Ecological • Gametic mortality • Habitat (most common)

  5. Post-Zygotic Isolation Mechanisms • Hybrid viability – • embryonic premature death • Hybrid infertility

  6. Allopatric Speciation • Geographic barriers

  7. Sympatric Speciation Species form within a population home range -no physical barriers

  8. Parapatric Speciation Neighboring populations give rise to new species X Bullock’s Oriole Baltimore Oriole Hybrid

  9. m. domesticus m. musculus

  10. Speciation Patterns Cladogenesis – branching lineage Anagenesis – unbranching descent

  11. Exercise

  12. Patterns of Speciation

  13. Adaptive Radiation Adaptive Zones

  14. Extinction

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