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Unformatted text preview: BIO 311D LECTURE 5 Speciation Speciation
What defines a species? What are the criteria we should use? Typological Species concept Archaeorapter Spinosaurus Morphological species concept Phylogenetic species concept Biological Species Concept Problems with the biological species concept: Circular overlap Reproductive isolation Summary of species definitions Types of evolution Types 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 ?
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This note was uploaded on 03/06/2010 for the course BIOL 50755 taught by Professor Allgeier during the Spring '10 term at University of Texas-Tyler.
- Spring '10