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.
The three species are allopatric
and occupy a small area of the cordillera in western Antioquia and adjacent Risaralda.