We will first consider some simple models of diversity

We will first consider some simple models of diversity -...

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We will first consider some simple models of diversity. Two general processes that affect standing diversity are origination and extinction . These processes are in turn going to depend on the number of taxa, N present at any one time. Thus the change in the number of taxa per unit time , dN/dt can be described as follows: The rate of origination = O = # new taxa arising / existing taxon / unit time The rate of extinction = E = probability of extinction during period dt. thus, change in diversity = dN/dt = ON - EN = N(O-E) Diversity will be
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Unformatted text preview: constant if O = E , diversity will increase if O > E (speciation rates exceed extinction rates) and decrease if O<E . Diversity might be maintained at a constant level if an increase in O was matched with an increase in E: is there an equilibrium diversity ? This could only be achieved if there was some feedback between N, O and E to keep O and E in approximate balance. Consider a graphical model where the equilibrium number of species depends on the effect of N on the values of E and O (see figure)....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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