Species Abundance with Optimum Relations to Environmental Factors
Models are described for the numbers of individuals of species j on site i. It is assumed that the numbers can be conceived as independent trials from Poisson distributions. The expected numbers are thought to be a function of one or two environmental variables. This function is chosen to be Gaussian. Statistical tests are presented for goodness of fit and for contrasting several hypotheses concerning these models. Listings of computer programs for estimating the parameters involved, are available on request. A comparison of the models with the principal component analysis is included.
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