The famous Euler-Lotka polynomial equation, allows us to calculate the asymptotic population growth rate A if the survival function lx, which gives the probability of being alive from age 1 to age x, as well as the fecundity rate at age x, mx, are known. This equation has ! roots, that is, equal to the maximum number of age classes, which can be obtained numerically. The generation time is then given by
Many species have demographic rates that are almost constant or independent of age. If a is the age of first reproduction, and assuming ! = 1, we get a simplified expression for the generation time T = a + s/(A - s), where s is the adult survival rate. We see that in general, T decreases with A and increases with the net reproductive rate.
Was this article helpful?
Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.