Reproductive value (population genetics)
Reproductive value (not to be confused with breeding value) is a concept in demography and population genetics that represents the discounted number of future girl children that will be born to a woman of a specific age. Ronald Fisher first defined reproductive value in his 1930 book The Genetical Theory of Natural Selection where he proposed that future offspring be discounted at the rate of growth of the population; this implies that sexually reproductive value measures the contribution of an individual of a given age to the future growth of the population.
- = probability of surviving from age 0 to age
- = average number of offspring produced by an individual of age
In a population with a discrete set of age classes, Fisher's reproductive value is calculated as
where is the intrinsic rate of increase or Malthusian growth rate.
- Fisher, R. A. 1930. The Genetical Theory of Natural Selection. Oxford University Press, Oxford.
- Keyfitz, N. and Caswell, H. 2005. Applied Mathematical Demography. Springer, New York. 3rd edition. doi:10.1007/b139042