speciation in which the evolution of reproductive isolating mechanisms occurs within the range and habitat of the parent species. This form of speciation may be common in parasites.
(sim pat´ rik) [Gr. sym: same + patria: homeland] • The occurrence of genetic reproduction isolation and the subsequent formation of new species without any physical separation of the subpopulation. (Contrast with allopatric speciation, parapatric speciation.)
Development of a genetic discontinuity within a population even in the absence of geographic separation; also see Speciation, Allopatric Speciation
Two subpopulations become reproductively isolated without first becoming geographically isolated.
Speciation via populations with overlapping geographic ranges.
Origin of a new lineage totally within the distribution of an ancestral lineage, usually by the formation of absolute reproductive barriers.
the appearance of reproductive isolation and the formation of new species without any physical or geographical separation of the two populations. see also parapatric speciation and allopatric speciation
Sympatric speciation is the formation of a new species within a geographical area - it is probably caused by strong selection pressures. Compare with parapatric speciation and allopatry.
Sympatry is one of three theoretical models for the phenomenon of speciation. In complete contrast to allopatry, species undergoing sympatric speciation are not geographically isolated by, for example, a mountain or a river. The speciating populations generally share the same territory.