An allopatric interpretation for racial formation and a sequence of historical migration patterns and ecological shifts are hypothesized. artus Osgood) combine to form barriers to dispersal. If you are returning to continue the interactive video, select Resume. Physiographic factors (rivers) and ecological factors (riparian communities and the competitive sibling species, P. Our records indicate you have visited this interactive video on this device before. Migration and presumably gene flow between adjacent races is apparently at a minimum. Natural selection acting on individuals, leads to the evolution of. No localities of sympatry between races are known, and only three individuals of hybrid origin between any two races have been examined. cause the mutation for black fur to appear in the rock pocket mouse population. Races exhibit contiguous allopatry, as contact between adjacent races is established along major rivers. There is a sequential relationship between the present geographic distributions and the phylogenetic positions of the races, with the more ancestral at the northern and southern geographic margins and the more derived in the interior of the species range.
POCKET MOUSE EVOLUTION SERIES
One lineage involved the formation of a single race via a pericentric inversion in a small autosome the second involved the formation of five races through a series of four autosomal centric fusions and a pericentric inversion in the X-chromosome.
Two lines of evolution from a hypothetical ancestral arrangement account for the chromosome variants. The species inhabits a relatively restricted geographic range from northeastern Sonora, Mexico, south into northern Sinaloa, Mexico, within thornscrub and short-tree forest communities. Six chromosome races are described for the pocket mouse, Perognathus goldmani Osgood.
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