secondary intergradation

secondary intergradation

a zone of hybridization in which two previously separated populations have come together and interbred.
References in periodicals archive ?
Mayr defined primary intergradation as clinal variation that develops within a continuous series of populations and secondary intergradation as the consequence of junction between populations that have become differentiated in allopatry.
Rather, this high divergence suggests that the Iberian Peninsula is an area of secondary intergradation between two deeply diverged branches (Smith et al.
Rejection of the Hypotheses of a Primary or a Secondary Intergradation
The hypothesis of secondary intergradation was developed to explain the Spanish ratio cline between M and A haplotypes, which are highly divergent (ca.
Raymond & Hardy (1983) believed this variability to suggest secondary intergradation.
As climatic and ecological variables change only gradually along this cline (Espenshade 1964; Cohen 1973), a sharp discontinuity dividing populations into northern and southern groups would suggest secondary intergradation.
Primary and secondary intergradation cannot be distinguished by examining only the zone of transition (Endler 1977).

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