Lecture 16 Darwin and Evolution - Darwin & Natural...

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1 Darwin & Natural Selection
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2 References Custom Textbook – An Introduction to Biological Evolution , 2009 Pages 70 – 85 Additional Links of interest http://www.aboutdarwin.com/index.html http://anthro.palomar.edu/evolve/evolve_2.htm http://www.amnh.org/exhibitions/darwin/
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3 Lecture Outline Evidence that helped form Darwin’s thinking about the origin of species 1. Evidence from Beagle Voyage Geology Biogeography Fossils Birds 2. After Voyage Artificial Selection Thomas Malthus
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4 SIX LINES OF EVIDENCE formed Darwin’s thinking about the origin of species… 1. Geological observations Lyell’s ideas of uniformitarianism focused Darwin’s thinking The Earth was old Changed gradually Saw raised beaches, mountains, strata of fossils, etc… Witnessed an earthquake (in Concepcion, Chile) that elevated land 8 feet Profound effect on Darwin If that could happen in one day, why couldn’t the same process, repeated over millions of years, raise entire mountains? … And if mountains had taken shape over millions of years, was it possible that the same was true of species? Borah Peak, Idaho – 1983 http://quake.wr.usgs.gov/prepare/factsh
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5 2. Biogeographical Observations Recognized the relationships between physical characteristics of animal/plant species and their physical environments Saw the trends in degrees of relatedness between species in different geographical regions - i.e, a. Unique species on different Galapagos islands more closely similar to one another but were less similar to mainland species (less related) b. Species showed only subtle differences as they migrated from one place to another within South America yet showed profound differences in another continent c. Comparisons of the flora & fauna of S. America with those of Europe i.e., European hares versus Patagonian hares (rodents, not related to rabbits) Reasoned That animals of different climatic zones in South America were related to each other But not to animals of the same climatic zone on different continents Patagonian Hare European Hare
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6 3. Observations of Fossils Fossils and their locations revealed a pattern New species appeared where similar species had previously lived Relationship between old and new species a. South American fossils of recently extinct organisms more closely
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This note was uploaded on 11/16/2010 for the course NATURAL SC NATS 1505 taught by Professor Isley during the Spring '10 term at Columbia State Community College.

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Lecture 16 Darwin and Evolution - Darwin & Natural...

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