These factors may in some cases complement and act in conjunction with allopatry
or parapatry to bring speciation to completion (Howard and Berlocher 1998, Nagel and Schluter 1998, Schluter 2000, Nosil 2008b).
Mitochondrial DNA sequences from populations of these 5 species from throughout their distribution (Maui, Lanai and Molokai) were used to infer the geographic history of the species on East Maui and to determine whether diversification likely occurred in situ, or alternatively whether diversification occurred in allopatry
on different volcanoes.
By extension, mimics should not experience reduced predation in areas of allopatry
where harmful models are absent.
Miller (1964: 256) believed that "Two species may exist in close proximity and their ranges may even interdigitate, but they maintain a relationship of contiguous allopatry
and do not form mixed-species populations.
not hold for all angiosperms, particularly if only allopatry
Under the Recognition Concept of species, new taxa originate in allopatry
and remain within their preferred habitats until fresh conditions provoke a fresh pattern of range fragmentation (Turner & Paterson 1991).
The Evolutionary Species Concept does apply in such cases of allopatry
, however, although with considerable subjectivity in determining whether or not an allopatric population in sufficiently differentiated to be regarded as having established a unique evolutionary trajectory.
For example, diet of sympatric species of Myotis showed evidence of increased specialization versus the diet of the same species in allopatry
, suggesting the species were partitioning food where they overlapped geographically (Husar, 1976).
Although these two taxa are not sister species and the boundary between the Great Fish and Kei catchments therefore not a vicariant feature contributing to speciation, it may well now limit dispersal and maintain the allopatry
of these lineages.
Amaral's (1944) arrangement is not followed here because of the absence of allopatry
among the color pattern types.