speciation

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spe·ci·a·tion

(spē'shē-ā'shŭn),
The evolutionary process by which diverse species of animals or plants are formed from a common ancestral stock.

speciation

/spe·ci·a·tion/ (spe″se-a´shun) the evolutionary formation of new species.

speciation

(spē′shē-ā′shən, -sē-)
n.
The formation of new biological species through the process of evolution.

spe′ci·ate′ v.
spe′ci·a′tion·al adj.

spe·ci·a·tion

(spē'shē-ā'shŭn)
The evolutionary process by which diverse species of animals or plants are formed from a common ancestral stock.

speciation

the process by which new species are formed. Speciation occurs when gene flow has effectively ceased between populations where it previously existed and is brought about by ISOLATING MECHANISMS.see GEOGRAPHICAL ISOLATION.
References in periodicals archive ?
Relatively sparse nDNA geographical sampling weakens inferences regarding speciational mode for N.
A speciational history of "living fossils": molecular evolutionary history in horseshoe crabs.
Speciational evolution: a phylogenetic test with allozymes in Sceloporus (Reptilia).
Weighted squared-change parsimony was used with the gradual simulations and unweighted squared-change parsimony was used with speciational simulations [ILLUSTRATION FOR FIGURE 2 OMITTED].
under gradual or speciational models of change), p(BL/P) is implicitly assumed to be 1 and [Var.
For the speciational and punctuational models, the amount of character change was sampled from a Poisson distribution with its parameter adjusted to match the total expected amount of change in the phyletic model.