Expected species richness in a random sample of fixed size.
Species abundance distribution of the community (integer vector)
Sample size in terms of number of individuals (integer)
The expected number of species is calculated after Hurlbert 1971, Equation 3.
spec_sample is similar to the function
in the R package
Expected number of species in a sample of n individuals
Hurlbert, S.H. 1971. The nonconcept of species diversity: a critique and + alternative parameters. Ecology 52, 577-586.
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