Chromosomes and Systematics of American Ground Squirrels of The Subgenus Spermophilus

Nadler, Charles F.

doi:10.2307/1377889

Cited by 50 publications

(41 citation statements)

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“…It was previously postulated that S. townsendi karyotypes were interrelated by a series of Robertsonian centric fusions with karyotype changes progressing N adler Karyotypes o f Spermophilus totvnsendi from high to low diploid number (Nadler, 1966). Thus, the vigiliscanus group (2n = 46) of eastern Oregon is most representative of the ancestral stock from which the mollis-idahoensis (2n = 38) and townsendi-nancjae (2n = 36-38) populations evolved.…”

Section: Discussionmentioning

confidence: 99%

“…Animals were trapped alive and their chromosomes analyzed using a Colccmide, hypotonic citrate, acetic-orcein squash technique (Nadler and Block, 1962 (Nadler, 1966). Karyotypes were constructed and the number of aurosomc arms (FN) computed as described elsewhere (Nadi.kr, 1966 (Nadler, 1966): Washington, Benton Co., Prosser, six males and two females; Badger Canyon S. o f Kennewick, three males and two females; S. o f Kennewick 6.3 miles E. o f Badger Canyon, three males and two females.…”

Section: Materials Ami Methodsmentioning

confidence: 99%

“…Karyotypes were constructed and the number of aurosomc arms (FN) computed as described elsewhere (Nadi.kr, 1966 (Nadler, 1966): Washington, Benton Co., Prosser, six males and two females; Badger Canyon S. o f Kennewick, three males and two females; S. o f Kennewick 6.3 miles E. o f Badger Canyon, three males and two females. Total, 31.…”

Section: Materials Ami Methodsmentioning

confidence: 99%

“…The following specimens were reported previously (Nadler, 1966) The localities where these specimens were collected arc illustrated in Figure 5.…”

Section: Materials Ami Methodsmentioning

confidence: 99%

“…During an investigation of systematic relationships among various taxa of North American Sciuridae, chromosomes were analyzed from samples representing three subspecies of .S', to w n sen d iand a surprising degree of chromosomal diversity was observed (Nadler, 1966). S'.…”

Section: Introductionmentioning

confidence: 99%

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The chromosomes of Spermophilus townsendi (Rodentia: Sciuridae) and report of a new subspecies

Nadler¹

1968

Cytogenet Genome Res

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Chromosomes were analyzed from five subspecies of the ground squirrel, Spermophilus townsendi. The diploid chromosome number was 46 in S. t. vigilis and S. t. canus, 38 in S. t. idahoensis and S. t. mollis and 36 in S. t. townsendi. A chromosomally homogenous population of ground squirrels, separated from S. t. townsendi by the Yakima River and having 38 instead of 36 chromosomes, was recognized as a new subspecies, S. townsendi nancyae. Chromosomal evidence linked with zoogeography suggest that the subspecies of S. townsendi radiated from an ancestral population (2n = 46), probably originating in Oregon, with eventual spread north across the Columbia River (S. t. townsendi and nancyae) and southeast into Idaho, Utah and Nevada (S. t. mollis and idahoensis). Robertsonian centric fusion rather than dissociation of metacentric chromosomes receives strong zoogeographic support as the mechanism responsible for karyotype evolution in S. townsendi.

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Section: Discussionmentioning

confidence: 99%