GUILDS (version 1.4.7)

expected.SAD: 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)

Value

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

Arguments

theta

Fundamental biodiversity number theta

m

migration parameter

J

Total number of individuals in the local community

Author

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" )