primer (version 1.2.0)

succniche: A Four-state model of Successional Dynamics

Description

This is the five-state, two-species model of the succession-niche model, after Pacala and Rees (1998). For use with ode in the deSolve package.

Usage

succniche(t, y, params)

Arguments

t

Argument for the time point at integration

y

A vector of length four, for states, E, M, S, and R.

params

Vector or list of parameters

Value

Returns a list of length one, for use with ode in the deSolve package.

Component 1

vector of the state variable (a scalar for the proportion of sites occupied).

References

Pacala, S.W. and Rees, M. (1998) Models suggesting field experiments to test two hypotheses explaining successional diversity. The American Naturalist, 152, 729--737.

Stevens, M.H.H. (2009) A Primer of Ecology with R. Use R! Series. Springer.

See Also

levins, compcol, compcolM

Examples

# NOT RUN {
params.suc <- c(a=7, c=0.2, g=.1, m=0.04, D=0)
t=seq(0,50,.1)
init.suc <- c(S=0, E=0.5, M=0.5, R=0.00) # Free space is implicit, F=1-(S+E+M+R).
ccg.out <- data.frame(ode(init.suc, t, succniche, params.suc))
matplot(t, ccg.out[,-1], type="l", ylab="Relative Frequency",
         xlab="Time", ylim=c(0,1) )
legend("right", colnames(ccg.out)[5:2], lty=4:1,  bty="n")

# }