Classical models of
allopatric and parapatric divergence do not involve population restrictions; however, low genetic variability is expected when population bottlenecks are integral to divergence, as in some models of peripatric divergence and most models of sympatric divergence.
A comparative structural cytogenetic study in three
allopatric populations of Astyanax scabripinnis (Teleostei: Characidae).
Our results showed that eastern snapping turtles were predominantly trapped in locations where no alligator snapping turtles were encountered (20
allopatric eastern snapping turtles, 7 sympatric eastern snapping turtles).
fajardi has been found in
allopatric populations, without a defined pattern of modification.
In this study, we investigated the gametic compatibility between two
allopatric populations of C.
The coalescence theory establishes that the high values of Fst index may be explained if we assume a mutation process involving exclusively as evolutionary force occurring in
allopatric populations separated by at least 4N generations (Avise 2000).
In line with the popular theory of
allopatric speciation, previous thinking had been that the confinement of T.
Here, we focus on molecular species diagnosis, inferences about the abundance and distribution of oyster species in the northern Ariake Sea, and gamete incompatibility between sympatric and
allopatric populations of the Kumamoto and Pacific oysters, C.
Most species are contiguously
allopatric and actively partition common habitat areas (Heller 1971).
Theatops spinicaudus comprises two
allopatric populations, an eastern one that extends from southwestern Virginia and western North Carolina to east-central Alabama and eastern Tennessee, and a western one extending from central Iowa and northern Illinois to southern Arkansas and eastern Oklahoma (Shelley 2002:Fig.
pora is
allopatric with respect to the known distribution of the bonariensis group, all component species of which are also
allopatric with one another (Fig.