untb (version 1.6-5)

untb-package: Unified neutral theory of biodiversity

Description

Numerical simulations, and visualizations, of the unified neutral theory of biodiversity

concept

• Chinese restaurant
• Chinese restaurant process

Details

ll{ Package: untb Type: Package Version: 1.0 Date: 2005-10-26 License: GPL }

Package untb uses two classes of object to represent an ecosystem: class count and class census. In essense, a count object is a table of species abundances and a census object is a list of individuals. See ?census and ?count for more details. Although objects of either class can be coerced to the other, class count is the preferred form: it is a more compact representation, especially for large ecosystems.

The package simulates neutral ecological drift using function untb(). Function display.untb() displays a semi-animated graphic of an ecosystem undergoing neutral drift.

References

• S. P. Hubbell 2001.The Unified Neutral Theory of Biodiversity. Princeton University Press.
• R. K. S. Hankin 2007.Introducing untb, an R package for simulating ecological drift under the unified neutral theory of biodiversity. Journal of Statistical Software, volume 22, issue 12

Examples

a <- untb(start=rep(1,100),prob=0.005,gens=5000,keep=FALSE)
preston(a)
no.of.spp(a)

display.untb(start=rep(1,100),prob=0.1,gens=1000)

data(butterflies)
plot(butterflies,uncertainty=TRUE)

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