(al´ lo pat´ rick) [Gr. allos: other + patria: fatherland] • Also called geographical speciation, this is the formation of two species from one when reproductive isolation occurs because of the the interposition of (or crossing of ) a physical geographic barrier such as a river. (Contrast with parapatric speciation, sympatric speciation.)
speciation in which the evolution of reproductive isolating mechanisms occurs during physical separation of the populations.
Speciation in which spatial isolation of populations precedes their differentiation (compare allochronic speciation).
Development of a genetic discontinuity between groups of individuals as they become geographically separated from each other; Related Terms: Speciation, Sympatric Speciation
population is split into two (or more) geographically isolated subdivisions that organisms cannot bridge
The differentiation of geographically isolated populations into distinct species.
Speciation through geographically separated populations( population).
The process of the splitting of a species into two or more new species that occurs between populations that are geographically isolated from each other.
Speciation that occurs when two or more populations of a species are geographically isolated from one another sufficiently that they do not interbreed.
Speciation by geographical splitting of a population, usually by the establishment of a physical barrier to gene flow.
often called geographic speciation. When reproductive isolation occurs because some physical geographic barrier prevents gene flow between the two populations. see also parapatric speciation and sympatric speciation
Where different populations are formed, without intermediates, if physical barriers restrict gene flow. There are two types: vicariant speciation and peripatric speciation.
Allopatric speciation, also known as geographic speciation, occurs when populations physically isolated by an extrinsic barrier evolve intrinsic (genetic) reproductive isolation such that if the barrier between the populations breaks down, individuals of the two populations can no longer interbreed. Although there is some debate about the frequency of other types of speciation (such as sympatric speciation, parapatric speciation, and heteropatric speciation), all evolutionary biologists agree that allopatry is a common way that new species arise.