Return to search

Genic Differentiation and Evolution in the Ground Squirrel Subgenus Ictidomys (Spermophilus)

The genetic structure of 26 natural populations of three species (S. tridecemlineatus, S. mexicanus, and S. spilosoma) of the Ictidomys subgenus of ground squirrels was analyzed using chromosomal and electrophoretic techniques. Chromosomal variation was not observed in S. mexicanus, and only slight karyotypic variation was found in the other two species. Chromosomal evidence indicated hybridization between S. tridecemlineatus and S. mexicanus, placing these species within the classical definition of semispecies. Analysis of electrophoretic variation at 29 genetic loci indicated close genetic relationships between these species. Evolution in Ictidomys appears to be linked with Pleistocene events, and speciation appears to have occurred within the last 155,000 years.

Identiferoai:union.ndltd.org:unt.edu/info:ark/67531/metadc663011
Date12 1900
CreatorsCothran, E. Gus, 1951-
ContributorsZimmerman, Earl G., Busbee, David L., Fitzpatrick, Lloyd C.
PublisherNorth Texas State University
Source SetsUniversity of North Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis or Dissertation
Formatvii, 112 leaves: ill., Text
CoverageUnited States - Indiana, United States - Texas, United States - New Mexico, Mexico - Chihuahua
RightsPublic, Cothran, E. Gus, 1951-, Copyright, Copyright is held by the author, unless otherwise noted. All rights

Page generated in 0.0025 seconds