Biogeography

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Last Reading Assignment Chapter 18, The Cambrian Explosion and Beyond. Pay close attention to the following: How remains fossilize, strengths/weaknesses of the fossil record The Cambrian Explosion: The Ediacarans and the Burgess Shale Fauna All of sections 18.3 and 18.4. Don’t worry about species/taxon names.
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Objectives What is Biogeography? Impacts of a Major Geological Event on a Continental and Marine Biota Phylogeography The latitudinal gradient
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What Is Biogeography? Biogeography: the science devoted to documenting spatial patterns of biodiversity. It is the study of the distributions of organisms (including species and higher level taxa such as genera and families), in both the past and present.
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Biogeography Has Many Sub Disciplines Zoogeography: Animal Biogeography Phytogeography: Plant Biogeography Historical Biogeography: the reconstruction of the origin, dispersal and extinction of taxa, as well as biotas
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Biogeography Biogeographic patterns (the geographic distribution of genetic lineages) result from two processes: Dispersal and Vicariance Dispersal : The movement of organisms away from their point of origin Vicariance : The splitting of faunas (or populations) as a result of the formation of a physical barrier.
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The Formation of the Isthmus of Panama: A Major Geological Event With Profound Evolutionary Consequences Isthmus of Panama
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Plate Tectonics (Alfred Wegener): Pangaea and Panthalassa Pangaea Begins to Break Up 180 Million Years Ago Africa and South America Separate 125 Million Years Ago
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South America Was Isolated Until the Formation of the Panamanian Isthmus 3 Million YPB 3 million YBP
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Consequence A: The Great American Interchange
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Biogeography - Biogeography not covered in text Last...

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