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Darwin's Finches - The Galapagos Islands Darwin's Finches Evolution by Natural Selection Located approximately 1000 km from the coast of Ecuador

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Darwin’s Finches Evolution by Natural Selection 13 The Galapagos Islands • Located approximately 1000 km from the coast of Ecuador, South America. • This is just a little closer than the distance between Atlanta and Dallas/TX. – Mostly deep water between the Galapagos Islands and the coast of South America. 14 15 Galapagos Endemics Among the kinds of animals found here and nowhere else : – 1 penguin species – 1 giant tortoise species – 1 marine iguana species – 7 species of lava lizard – 14 species of sea cucumber – 1 species of sea lion – 1 species of hawk – several species each of mockingbirds, doves, owls, flycatchers, and yellow warblers – 14 species of finches 16 Charles Darwin • Darwin explored these islands from April through October 1835. – Entire voyage of The Beagle : Dec 1831 - Oct 1836 • During this voyage he started thinking about what was to become his theory of evolution by natural selection. • He did not publish his thoughts until the publication of The Origin of Species in 1859. 17 Charles Darwin’s Ideas Biological evolution is change in species over time. – This was not a new idea at the time of Darwin – But there was no good understanding of a mechanism (how? why?) to explain how these changes occurred Natural selection is one possible mechanism, and this is what Darwin contributed. 18
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Is it evolution by natural selection? Darwins’ 4 postulates: 1. Individuals within species are variable. 2. Some of these variations are passed on to offspring. 3. In every generation, more offspring are produced than survive. 4. Survival and reproduction are not random. Individuals who survive and go on to reproduce, or reproduce the most, are those with the most favorable variations. They are naturally selected. Darwin’s Finches 20 Is this evolution by natural selection? • Scientists Peter and Rosemary Grant have studied many of these finches with their students for the past thirty years. – Spend months at a time on the islands
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This note was uploaded on 08/30/2009 for the course BIO NA taught by Professor Stanger-hall during the Fall '09 term at University of Georgia Athens.

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Darwin's Finches - The Galapagos Islands Darwin's Finches Evolution by Natural Selection Located approximately 1000 km from the coast of Ecuador

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