Parapatric speciation

Parapatric speciation is a form of speciation that occurs due to variations in mating frequency of a population within a continuous geographical area.In this model, the parent species lives in a continuous habitat, in contrast with allopatric speciation where subpopulations become geographically isolated. Niches in this habitat can differ along a environmental gradient, hampering gene flow, and thus creating a cline.
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Speciation that occurs as a result of two populations diverging in adjacent geographical areas.

B: (Biologi) spesiasi parapatrik
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