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Principles of Evolution, Ecology and Behavior (EEB 122) Speciation is the process through which species diverge from each other and/or from a common ancestor. There are several definitions of species, most of which focus on reproductive isolation and/or phylogenetic similarities. This can cause some controversy. Speciation can result from geographical separation or ecological specialization. There are stages of speciation in which organisms cluster first into distinct populations before finally becoming different species. 00:00 - Chapter 1. Introduction 03:38 - Chapter 2. Diversity and How Speciation Happens 17:13 - Chapter 3. Concepts and Criteria of Speciation 26:04 - Chapter 4. The Genetics of Speciation 34:41 - Chapter 5. Mechanics and Examples of Speciation 40:30 - Chapter 6. Experiments, Applications, and Cryptic Species 48:09 - Chapter 7. Summary Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2009.