BIO211H5 Lecture Notes - Habitat Destruction, Georges Cuvier, Anagenesis
Document Summary
Sept 28th o o o o o o o o o o o o. Extinction extinction: the total disappearance of species or a higher taxon fossil record is the only direct evidence that life has changed substantially through time, and that millions of species have disappeared from earth. Mass extinction: large-scale global extinction; large numbers of species become extinct in a short amount of time. Georges cuvier early acknowledgement of extinction (1786: most older european naturalists thought fossil creatures now lived in tropical regions o. Cuvier pointed out that fossil mammoths were so large that any still around would not be able to be missed high rates of extinction can help identify useful index fossils (origination turnover) Causes usually caused by extreme cases of normal limiting factors predation disease competition environmental stress chance fluctuations in pop numbers. More rare taxa are more at rick.
