Abstract
AbstractPossible ways for making general conclusions on Fisher's fundamental theorem on natural selection are discussed in this paper for the following three cases. I. A partially isolated population connected by a two‐way migrant flow with the centre of the specific range. 2. A limited population, i.e. a population wherein the fitnesses of the genotypical groups depend on density. 3. An elementary biocoenosis comprising two competing polymorphic species, each of which is represented by a Mendelian one‐locus population. For all three cases, a function has been found that rises monotonously along the trajectory and plays the same role as the average fitness in Fisher's theorem.
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