@Lecture02_4

@Lecture02_4 - 1 PALEOBIOLOGY 1 Fall 2010, GEL 107: Lecture...

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Unformatted text preview: 1 PALEOBIOLOGY 1 Fall 2010, GEL 107: Lecture 02 Fossil Record 2 How many species live today? ow many species existed in the past and Outline How many species existed in the past, and how many of them are known? Why is the fossil record useful despite its incompleteness? 3 How do we collect/analyze fossils? When did humans recognize fossils for what they are? 3 Answer: We do not know for sure. 4 2 5 Tropical rain forest 6 7 Answer: We do not know for sure. 8 BUT, we have estimates. 3 Insects Plants ca. 300,000 ca. 800,000 Number of Described Species Vertebrates Reptiles Birds ammals Amphibians a. 5,000 ca. 10,000 ca. 8,000 ca. 5,000 9 Mammals ca. 5,000 Fish at least. 50,000 In total 1.4 1.6 million Many others Estimated Number of All Species ca. 5 million (2-8 million) 10 Some say 30 million 11 12 Based on an estimate of 14 million species 4 How many species live today? ow many species existed in the past and Outline How many species existed in the past, and how many of them are known?...
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This note was uploaded on 11/02/2010 for the course GEL GEL 107 taught by Professor Jishin during the Winter '09 term at UC Davis.

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@Lecture02_4 - 1 PALEOBIOLOGY 1 Fall 2010, GEL 107: Lecture...

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