Cladogenesis

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cladogenesis

[‚klad·ə′jen·ə·səs]
(evolution)
Evolution associated with altered habit and habitat, usually in isolated species populations.

Cladogenesis

 

(from Greek klados, “branch,” and “genesis”), a form of evolution of a group of living organisms leading by means of divergence to an increase in the number of separate species, genera, and families. The term, introduced by the German biologist B. Rensch in 1947, is often used as a synonym for speciation in the narrow sense—not completely accurately, since cladogenesis includes any increase in evolutionary diversity. The concept of cladogenesis is closely related to adaptive radiation and idioadaptation.

REFERENCES

Takhtadzhian, A. L. Sistema i filogeniia tsvetkovykh rastenii. Moscow-Leningrad, 1966. Pages 15–25.
Rensch, B. Neuere Probleme der Abstammungslehre: Die transspezifische Evolution, 2nd ed. Stuttgart, 1954.
References in periodicals archive ?
We observed significantly greater within-group morphometric variance at all three morphological levels in those lineages with decoupling events in their respective cladogenetic histories.
In conclusion, the conjunction of these approaches has shown no simple associations between cladogenetic patterns and cromosomal changes.
Extrapolating from either case to character evolution in general requires that, whenever a cladogenetic event occurs, character states that are opposite to those in the ancestral species are either universally favored [TABULAR DATA FOR TABLE 1 OMITTED] (consistently producing erroneous inferences) or universally disfavored (consistently producing correct inferences) in the descendants, and that this trend continues only until the next cladogenetic event, so that equilibrium conditions (consistently producing correct inferences) are never achieved.
236) "if the main branching events in the phylogeny occurred swiftly, without much evolutionary change between dichotomies, comprehensive reconstruction of the cladogenetic history of primitive Paleartic and Oriental lacertids may not be possible.
In this context, Neigel and Avise's (1986) results indicate that, even if redpoll forms are genetically isolated from each other, the widespread distribution of haplotype I among forms is not surprising, as long as the cladogenetic events were relatively recent.