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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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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 Common west coast species: Clockwise, upper Left: purple urchin Strongylocentrotuspurpuratusred urchin S. franciscanus and green urchin S. droebachiensis
Prezygotic isolation • Mechanical
Postzygotic isolation - hybrid viability - hybrid sterility
Biological species challenges Fossil species - Bat from Wyoming • Asexual species • Butterfly lizard (Leiolepisngovantrii) • Eschirichia coli Ring species – Larusargentatus (herring gull)
Morphospecies 63 morphospecies of semaeostome jellyfishes Fungi that rot a plant in Ecuador Trilobites
Phylogenetic species Order Carnivorasynapomorphy = Carnassial teeth Suborder Feliformiasynapomorphy = double chambered auditory bulb
Sympatric speciation Potential explanation for speciation of cichlid fish in Lake Victoria