For many populations, births and growth occur in regular (predictable) times each year (or each cycle). Discrete time models are well suited to describe the life histories of organisms with discrete reproduction and/or growth. For example, the Beverton-Holt stock-recruitment model for a population Nt at time t is

Nt+1 = rNt

( 1 +Nt

r − 1 K

)−1 .