Geo sci 103 Lec 11

Geo sci 103 Lec 11 - K/T boundarybetween cretaceous and...

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Geosci 103 Lec 11 17:10 More than 99% of all organisms that ave ever lived are extinct  What do I mean by the word extinct? The end of a species… death of a species Cessation of existence of a species or set of species  Cuvier was able to take and show that mammoth is also a difference species… look at skulls….and jaws  Extinction is, admittedly, not a well-understood phenomenon Intrinsic factors—rate of reproduction, breeding behavior, length of lifetime… Stock market analogy Fewer companies earlier Different companies important at different times Gambler’s Ruin Trajectory based on probability All runs end at the absorbing boundary  All species start near absorbing boundary, many remain there 
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Unformatted text preview: K/T boundarybetween cretaceous and tertiary Event in which most of dinosaurs went extinct Happened 65 MYA Many species go extinct Many types of species go extinct Mass extinction is when 70% species go extinct Creatceous/tertiary estimated 76% of all species went extinct 65 MYA Triassic, jurrasic, cretaceousMesozoic era Ends and starts with extinction event Species area effectarea of habitat correlated with population size. Reduction in habitat area results in reduction in species number (extinction) Volcanic activity is another cause Rocks from space-- 17:10 17:10...
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Geo sci 103 Lec 11 - K/T boundarybetween cretaceous and...

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