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Formula
Since we do not know how many species there were in either community we do not know if any more species would have been found if our second survey had observed more individuals than it actually did. But, using the hypergeometric model, we can estimate how many species we would expect to observe among a subsample, of m observations, from our larger survey of n observations
Notice that this only enables us to estimate the number of species we expect to observe if we know how many organisms represented each species in our larger survey. Also the model only applies for individualbased rarefaction. If samples are taken randomly rather than individuals, then one must use MonteCarlo resampling to produce the rarefaction curves (See Gotelli & Colwell (2001))
