Biogeography - Western Oregon University
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Biogeography • Large scale patterns of global diversity • Geographic gradients • Environmental gradients • Long term distributions: Evolutionary processes
Transcript of Biogeography - Western Oregon University
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Biogeography• Large scale patterns of global diversity• Geographic gradients• Environmental gradients• Long term distributions: Evolutionary processes
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Species richness
Boreal forests of Canada
Elevational gradient in Arizona
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Patterns of Species richness
• Latitudinal patterns• Temperate zone
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Theories
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Theories
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Patterns of speciation
Circumpolar
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Extinctions
• Continental differences
• Alps created a barrier• North America vs
China, connections to tropics.
• SE US and Europe separated from tropical flora
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Continental patterns
Endemism and isolation
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Transition zones
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C3 and C4 plants
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Endemism and Isolation