XX.3.6 The definition of species based on phenotypic cohesion assumes the presence of a certain species cohesion mechanism

According to the cohesion species concept (Templeton 1989)a species is the largest delimited population that functions as an internal mechanism ensuring mutual phenotype cohesion of its members.Phenotype cohesionof a population is understood to mean maintenance of mutual similarity of its members even when the average appearance of individuals in the population changes in time and the population develops as a whole.

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The classical Darwinian theory of evolution can explain the evolution of adaptive traits only in asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in both asexual and sexual organisms Read more
Draft translation from: Evoluční biologie, 2. vydání (Evolutionary biology, 2nd edition), J. Flegr, Academia Prague 2009. The translation was not done by biologist, therefore any suggestion concerning proper scientific terminology and language usage are highly welcomed. You can send your comments to flegratcesnet [dot] cz. Thank you.