Description Usage Arguments Value Author(s) References See Also Examples
A function for the metaapopulation dynamics, for use with ode
in the
deSolve
package.
1 |
t |
Argument for time |
y |
A scalar for the population variable |
parms |
Vector or list of parameters |
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). |
Hank Stevens <HStevens@muohio.edu>
P. Kareiva and Wennergren, U. (1995) Connecting landscape patterns to ecosystem and population processes. Nature, 373, 299–302.
Lande, R. (1987) Extinction thresholds in demographic models of territorial populations. The American Naturalist, 130, 624–635.
Stevens, M.H.H. (2009) A Primer of Ecology with R. Use R! Series. Springer.
gotelli
, hanski
,levins
,
MetaSim
, clogistic
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ## The function is currently defined as
function (t, y, parms)
{
p <- y[1]
with(as.list(parms), {
dp <- ci * p * (1 - D - p) - e * p
return(list(dp))
})
}
library(deSolve)
p <- c(ci=.1, e=.01, D=.5)
time <- 1:10
initialN <- .3
out <- ode(y=initialN, times=time, func=lande, parms=p)
plot(time, out[,-1], type='l')
|
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