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Cascading Chromosomal Speciation in Lizards: A Second Look

著者: Sites, Jack W Jr; Thompson, Pamela; Porter, Calvin A
出版商: University of Hawaii Press 2008-04-07T08:41:15Z 2008-04-07T08:41:15Z 1988
版本/格式:   可下载的档案资料
提要:
The extent of Robertsonian chromosomal variation in the iguanid lizard Sceloporus grammicus of Mexico is exceptional among lower vertebrates, and this case has been the basis for the cascading chromosomal speciation hypothesis. This paper examines some of the population genetic assumptions of this model by comparing allozyme variability within and among 13 samples of S. grammicus with an equal number of samples of  再读一些...
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类型/形式: Article
Text
材料类型: 互联网资源
文件类型: 互联网资源, 档案资料
所有的著者/提供者: Sites, Jack W Jr; Thompson, Pamela; Porter, Calvin A
OCLC号码: 652310377
语言注释: en_US

摘要:

The extent of Robertsonian chromosomal variation in the iguanid lizard Sceloporus grammicus of Mexico is exceptional among lower vertebrates, and this case has been the basis for the cascading chromosomal speciation hypothesis. This paper examines some of the population genetic assumptions of this model by comparing allozyme variability within and among 13 samples of S. grammicus with an equal number of samples of the chromosomally monotypic congener S. graciosus. Only homologous enzyme loci resolved in both species are used in the comparison. Estimates of such parameters as mean levels of heterozygosity, average number of alleles per locus, genetic distances, and F statistics are generally inconsistent with assumptions of strong population subdivision and/or recent bottlenecks associated with extinction-colonization events in S. grammicus.. We tentatively conclude that the population structure of at least some chromosome races in this complex is sufficiently panmictic to retard the fixation of electromorphic variants. Problems of making inferences about speciation mechanisms from population genetic correlates are discussed.

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