untb (version 1.6-5)

rand.neutral: Random neutral ecosystem

Description

Given the size of the metacommunity $J$, and the fundamental biodiversity number $\theta$, generate an object of class count using a stochcastic mechanism consistent with the neutral theory.

Usage

rand.neutral(J, theta=NULL, prob.of.mutate=NULL, string = NULL, pad = FALSE)

Arguments

J
Size of metacommunity
theta
Fundamental biodiversity number $\theta$. User must supply exactly one of theta and prob.of.mutate.
prob.of.mutate
Probability of mutation $\nu$: $\theta=2J\nu$.
string
String to add to species names. By default (ie string being NULL), species are named 1, 2,$\ldots$. Argument string supplies a prefix for these species names; a good o
pad
Boolean, with default FALSE meaning to return a count object having only extant species, and TRUE meaning to pad the count with extinct species to J species. Use this when a vector of length

Details

Uses the simulation method on page 289 of Hubbell (2001).

References

S. P. Hubbell 2001. The Unified Neutral Theory of Biodiversity. Princeton University Press.

See Also

untb

Examples

Run this code
rand.neutral(1000, 9)
rand.neutral(1000, 9, string="spp.")

data(butterflies)
rand.neutral(no.of.ind(butterflies), optimal.theta(butterflies),string="spp.")


# what is the distribution of abundance of the second ranked species if
# J=10, theta=0.7?
plot(table(replicate(100,rand.neutral(10,theta=0.7,pad=TRUE)[2])))

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