parapatric speciation


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Related to parapatric speciation: genetic drift

parapatric speciation

[¦par·ə¦pa·trik ‚spe·shē′ā·shən]
(evolution)
Gradual speciation whereby new species are created from populations that maintain overlapping geographic zones of genetic contact.
References in periodicals archive ?
This model predicts parapatric speciation across steep environmental gradients (boundaries) without the separation of the representative populations (Endler, 1982).
Here I shall advance the argument that habitat and microenvironmental gradients in edaphic and canopy conditions through the process of parapatric speciation may be important for the generation of much of the high species richness in neotropical palms.
Under allopatric and parapatric speciation models only a subset of the mt-haplotype variation would be captured by the incipient species; an even smaller subset would be captured under stasipatric and sympatric speciation models - although in the latter two models the effective population size for nuclear autosomes would also be reduced.
1983); (2) reproductive isolation as a by-product of selection along the altitudinal gradient is a mechanism for parapatric speciation (Endler 1977; Barton 1983); and (3) the role of selection versus drift in the evolution of reproductive isolation is poorly understood (Coyne 1992).
Mallet generalizes from Heliconius raciation to underdominant chromosomes and epistatic gene combinations, arguing that the shifting-balance model could equally well cause parapatric speciation by such substitutions.
Parapatric speciation, a third form of allopatric speciation (Bush 1975; Endler 1977), was not considered by Lynch because it appears to be phylogenetically indistinguishable from other forms of allopatric speciation (Wiley 1981: Cracraft 1982).