Description Usage Arguments Value Author(s) References See Also Examples
A Lotka-Volterra model of intraguild predation, after Holt and Polis (1997).
For use with ode
in the deSolve
package.
1 |
t |
the time point for a realization of the integration. |
y |
the vector of populations, at each time t. |
params |
a vector or list containing the necessary parameters. |
Returns a list of length one which is the vector of the rates of
increase (required by ode
).
Hank Stevens <HStevens@muohio.edu>
Holt, R.D. and Polis, G.A. (1997) A theoretical framework for intraguild predation. The American Naturalist, 149, 745–764.
Stevens, M.H.H. (2009) A Primer of Ecology with R. Use R! Series. Springer.
1 2 3 4 5 6 7 8 9 10 11 | library(deSolve)
params <- c(bpb= 0.032, abp=10^-8, bpn=10^-5, anp=10^-4, mp=1,
bnb=0.04, abn=10^-8, mn=1,
r=1, abb=10^-9.5)
t=seq(0, 60, by=.1)
N.init <- c(B = 10^9, N = 10^4, P = 10^3)
igp.out <- ode(N.init, t, igp, params)
matplot(t, log10(igp.out[,-1]+1), type="l",
ylab="log(Abundance)")
legend('right', c("B", "N", "P"), lty=1:3, col=1:3, lwd=2,
bty="n")
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.