14_PPTLecture_LEC+spr - Chapter 14 The Origin of Species In...

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Unformatted text preview: Chapter 14 The Origin of Species In London Under ground mosquitoes belong to the species Culex molestus Are active all year Feed on humans and rodents Named for their pesty behavior Above ground mosquitoes belong to a species called Culex pipiens Hibernate in the winter Prefer to bite birds Mosquito Mystery Speciation is the emergence of new species In England and North America Two species of mosquitoes exist and spread West Nile virus The origin of species is the source of biological diversity Speciation, the origin of new species Is at the focal point of evolution Figure 14.1 Macroevolution Which begins with the origin of new species Microevolution is natural selection and the gradual adaptation of population to its environment CONCEPTS OF SPECIES What is a species? Carolus Linnaeus, a Swedish physician and botanist Used physical characteristics to distinguish species Developed the binomial system of naming organisms Linnaeus system established the basis for taxonomy The branch of biology concerned with naming and classifying the diverse forms of life Similarities between some species and variation within a species Can make defining species difficult Figure 14.2B Figure 14.2A . The Biological Species Concept The biological species concept defines a species as A population or group of populations whose members can interbreed and produce fertile offspring Other Species Concepts The morphological species concept Classifies organisms based on observable phenotypic traits The ecological species concept Defines a species by its ecological role The phylogenetic species concept Defines a species as a set of organisms representing a specific evolutionary lineage Reproductive barriers keep species separate Reproductive barriers Serve to isolate a species gene pool and prevent interbreeding Are categorized as prezygotic or postzygotic...
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This note was uploaded on 05/12/2008 for the course BIOL 1101 taught by Professor Mason during the Spring '08 term at Middle Georgia State College.

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14_PPTLecture_LEC+spr - Chapter 14 The Origin of Species In...

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