Size of the ecosystem. In the case of
fisher.ecosystem(), the expected size of the ecosystem
S
Number of species in ecosystem
alpha
In function fisher.ecosystem(), Fisher's
\(\alpha\). If not supplied, it will be calculated from
N and S.
give
In function fishers.alpha(), Boolean variable with
default FALSE meaning to return alpha, and TRUE
meaning to return a list containing x and alpha.
nmax
In function fisher.ecosystem(), the maximum number
of species abundance classes to consider
c
In function fisher.ecosystem(), the rare species
advantage term
Details
Function fishers.alpha() solves for \(\alpha\) given
\(N\) and \(S\), as per Fisher's table 9, p55.
Given \(N\) and \(S\) (or \(\alpha\)), function
fisher.ecosystem() generates a Fisherian ecosystem
with expected size \(N\) and expected species count \(S\).
References
R. A. Fisher and A. S. Corbet and C. B. Williams 1943. “The
relation between the number of species and the number of individuals in
a random sample of an animal population”, Journal of Animal
Ecology, volume 12, pp 42--58