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Speciation

Speciation. Prezygotic isolation Temporal – crickets mature at different times. Prezygotic isolation Habitat – land vs. water garter snakes. Prezygotic isolation Behavioral – firefly mating. Prezygotic isolation Gametic – sea urchins shed gametes at same time.

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Speciation

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  1. Speciation

  2. Prezygotic isolation • Temporal – crickets mature at different times

  3. Prezygotic isolation • Habitat – land vs. water garter snakes

  4. Prezygotic isolation • Behavioral – firefly mating

  5. Prezygotic isolation • Gametic – sea urchins shed gametes at same time Common west coast species: Clockwise, upper Left: purple urchin Strongylocentrotuspurpuratusred urchin S. franciscanus and green urchin S. droebachiensis

  6. Prezygotic isolation • Mechanical

  7. Postzygotic isolation - hybrid viability - hybrid sterility

  8. Biological species challenges Fossil species - Bat from Wyoming • Asexual species • Butterfly lizard (Leiolepisngovantrii) • Eschirichia coli Ring species – Larusargentatus (herring gull)

  9. Morphospecies 63 morphospecies of semaeostome jellyfishes Fungi that rot a plant in Ecuador Trilobites

  10. Cryptic species

  11. Phylogenetic species Order Carnivorasynapomorphy = Carnassial teeth Suborder Feliformiasynapomorphy = double chambered auditory bulb

  12. Phylogenetic species

  13. Allopatric speciation

  14. Allopatric speciation - vicariance

  15. Allopatric speciation - dispersal

  16. Sympatric speciation Potential explanation for speciation of cichlid fish in Lake Victoria

  17. Hybridization

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