Lecture 19 Speciationbb

Lecture 19 Speciationbb - apples Maggot flies hawthorns 4)...

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Macroevolution Speciation Process Adaptive Radiation Mass Extinctions
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What is a species???
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Biological Species Concept
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Morphospecies Concept
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Two species?
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Ants
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Phylogenetic Species Concept The smallest set of organisms that share an ancestor and can be distinguished from other such sets
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Monophyletic Groups
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Single common ancestor
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Morphology vs. DNA sequences for determining monophyletic groups
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Synapomorphies = shared derived characters Morphology
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DNA Sequences
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Case study: Morphological vs. Phylogenetic Species Definition Dusky seaside sparrow Salt marsh
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Conservation Attempt
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Phylogeny
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Speciation
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Speciation Caused by Genetic isolation Genetic divergence
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Reproductive Mechanisms that STOP gene flow Prezygotic isolation (5) Postzygotic isolation (2)
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Mechanisms I. Prezygotic isolation (5) II. Postzygotic isolation (2)
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I. Prezygotic isolation (5)
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1) Temporal Isolation
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1) Temporal: Frogs
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1) Temporal: Pines Monterey Pine Bishop Pine
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2) Behavioral: Firefly Courtship
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2) Behavioral: Songbirds
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2) Behavioral: Fiddler Crabs
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3) Habitat: Flies
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Unformatted text preview: apples Maggot flies hawthorns 4) Mechanical (anatomical incompatibility) Stigma 5) Gametic Barrier: Sea Urchins II. Postzygotic Isolation (2) 1) Reduced hybrid viability Ring-necked doves + rock doves die as embryos mare donkey mule 2) Hybrid sterility e.g., Zebroid Male lion + female tiger e.g., Ligers Tigon Male Tiger & Female Lion Whats the fitness cost to two species mating & producing sterile hybrids? Part II. Speciation Process Steps Step 1 : Isolation (Gene flow) Step 2 : Divergence (Genetic drift) Step 3 : Reproductive isolation evolves Two Models for Step 1: Gene Flow Interruption A. Allopatric Model of Speciation B. Sympatric Model of Speciation A. Allopatric Speciation (physical isolation) I. Colonization II. Vicariance I. Colonization II. Vicariance Allopatric Speciation I. Colonization II. Vicariance Ex. Vicariance Speciation Continental Drift & Ratites Gondwana breaks up Isolated populations of Ratites...
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Lecture 19 Speciationbb - apples Maggot flies hawthorns 4)...

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