BIO 24-Species - Office hours & help sessions BIO152:...

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1 11/14/2008 1 BIO152: What is a species? Lecture 24 December 1 See simulations http://www.pbs.org/wgbh/evolution/darwin/origin/index.html 11/14/2008 2 11/14/2008 3 Friday’s tutorial--review 11/14/2008 4 Outline: Speciation Defining and Identifying Species The Biological Species Concept The Morphospecies Concept The Phylogenetic Species Concept
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2 11/14/2008 5 What is a species? = evolutionarily independent group of organisms Sounds easy, but what does independent mean? One definition does not fit all situations OR we lack the evidence to definitively determine the ‘family history’ 11/14/2008 6 The Morphospecies Concept ± Evolutionary independence can be estimated by looking at morphology size, shape, colour or other distinguishing features 11/14/2008 7 morphospecies concept Advantages : can be applied to organisms which ± Are fossils ± Reproduce sexually ± Reproduce asexually Disadvantages: ± Subjective ± Similarity does not necessarily mean related 11/14/2008 8 Are the skulls in these two groups different enough to be two species?
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BIO 24-Species - Office hours & help sessions BIO152:...

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