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Unformatted text preview: diversity back down; similarly if extinction rates increased, speciation rates would increase and bring diversity back up (beware of using a teleological argument; these changes are effects of changes in diversity presumably occurring due to ecological pressures at the time, not for the purpose of restoring diversity). Observation of correlation of extinction and speciation rates suggest diversity dependent effects or feedback in an ecological sense. Can also model patterns of increase in diversity as one would model exponential growth in ecology N t = N e rt where r = birth rate - death rate (or in our case, origination rate - extinction rate). N = 1 species (beginning of group) and t = time since first fossil...
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- Fall '10