Lecture 5 posted - BIO 311D LECTURE 5...

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Unformatted text preview: BIO 311D LECTURE 5 Macroevolution (evolution of species) Speciation What defines a species? What are the criteria we should use? Morphological species concept Biological Species Concept Problems with the biological species concept: Circular overlap Reproductive isolation Summary of species definitions Types (or patterns) of evolution Types (or patterns) of speciation – Anagenesis – Cladogenesis (a) Anagenesis (b) Cladogenesis Modes of speciation Allopatric speciation Sympatric speciation Allopatric speciation Allopatric speciation A. harrisi A. leucurus Sympatric speciation Sympatry due to polyploidy Ring speciation (circular overlap) Biodiversity – importance and changes Adaptive radiations Cambrian radiation Dispersal Vacariance Extinction Ordovician Devonian Permian Triassic Cretaceous ? Permian ...
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Lecture 5 posted - BIO 311D LECTURE 5...

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