expected.SAD: Calculate the expected species abundance distribution of the...

In GUILDS: Implementation of Sampling Formulas for the Unified Neutral Model of Biodiversity and Biogeography, with or without Guild Structure

Calculate the expected species abundance distribution of the standard neutral model, given theta, m and J

Description

This function calculates the expected species abundance distribution of the standard neutral model given theta, m and J, sensu equation 6 from Etienne and Alonso (2005).

Usage

expected.SAD(theta, m, J)

Arguments

theta	Fundamental biodiversity number theta
m	migration parameter
J	Total number of individuals in the local community

Value

A vector containing the abundances binned into log2 bins (sensu Preston).

Author(s)

Thijs Janzen & Bart Haegeman

References

Etienne, R.S., & Alonso, D. (2005). A dispersal-limited sampling theory for species and alleles. Ecology Letters, 8(100), 1147-1156.

Examples

SAD <- expected.SAD(theta = 42, m = 0.1, J = 200)
barplot(SAD,
        names.arg=0:(length(SAD)-1),
	      xlab="Number of individuals (log2)",
	      ylab="Number of Species" )

GUILDS documentation built on April 12, 2025, 1:33 a.m.