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

expected.SAD {GUILDS} | R Documentation

## 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" )

[Package GUILDS version 1.4.4 Index]