speciation

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Related to speciations: specifications, Allopatric speciation

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

(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 ?
The method should be ideally suited for identifying ancient bursts of speciation in molecular (or other) phylogenies estimated from living species, even when the exact branching order of particular lineages is uncertain (as may often be the case in phylogenetic appraisals that involve many taxa, close nodes, and limited amounts of genetic or other information; see Hoelzer and Melnick 1994).
- To test for ancient bursts of speciation using the statistical approach of Wollenberg et al.
To statistically assess possible clustering in the temporal spacing of speciation events, the ML phylogeny with contemporaneous tips [ILLUSTRATION FOR FIGURE 2A OMITTED] was used to generate an empirical cdf [ILLUSTRATION FOR FIGURE 3A OMITTED] for comparison against the null cdf for stochastically generated trees composed of 29 extant species (Wollenberg et al.
Temporal Speciation Patterns in Cichlids and Icefishes.
The cdf of normalized branching times in this tree did not differ significantly from the null expectation generated under a Markovian process of stochastic speciation and extinction for a clade of this size ([ILLUSTRATION FOR FIGURE 3D OMITTED]; Table 1).