By Hutchins M., Schlager N.

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From the point of view of population dynamics there are three important differences between long-lived organisms and annual organisms. First, the former may begin reproducing after more than 1 year. Second, they may survive after reproduction and possibly reproduce again. The dynamics of such populations needs to be described with respect to particular ages or stages of the population and will be the subject of Chapter 4. Finally, in populations with overlapping generations, reproduction may not be discrete or synchronous.

One way of exploring this is to plot the log of the number of lineages (N) against time (Fig. 9). 2). Later we will see that there are good reasons for expecting systematic deviation from a linear fit. A linear fit through all the data (Fig. 6) Note that time before present is given a negative value so that the rate of increase is positive. 9869 1 0 –400 –350 –300 –250 –200 –150 –100 –50 0 Time (Myr ago) Fig. 9 Natural log of the number of amphibian lineages against time, based on the phylogeny in Fig.

If reproduction or diversification in a large clade is continuous then the difference between t and t + 1 is vanishingly small and therefore change is continuous and described by differential equations. In the following example we will discuss population change but the same ideas apply to diversification rates. In the discrete-time model it was found that population change was geometric in form (Fig. 11a). Now consider a continuously reproducing population. For a description of continuous geometric population change the separate points in Fig.

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