Modifies growth of population in time *t + 1* by the population size in time *t*.
Arguments
- N
Number of individuals or biomass in time t. Can (should) be a vector structure according to group_by.
- r
Intrinsic rate of increase or baseline growth rate.
- K
Carrying capacity. Can be a vector for each stage and can vary by patches.
- theta
Shape parameter that modifies the growth form from *t* to *t+1*. If *theta* = 1, then it takes a logitic shape (Beverton-Holt-like); if > 1, it becomes more concave; if < 1, it becomes more convex; and if *theta* = 0, then it takes an density-dependent exponential shape (Ricker-like).