A hybrid zone of the genus Ctenomys: a case study in southern Brazil

Genetics and Molecular Biology

Camila S. Castilho²  Adriana Gava¹  Thales R.o. De Freitas² 

[1] ,Universidade Federal do Rio Grande do Sul Departamento de Genética Porto Alegre RS ,Brazil

关键词: chromosome polymorphism;    subterranean rodent;    karyotypes;    microsatellite;   

DOI  :  10.1590/S1415-47572012000600014

来源: SciELO

【 摘 要 】

We describe variation at microsatellite loci and the chromosomal polymorphisms of a hybrid population, and hybridizing populations of Ctenomys minutus (the minor tuco-tuco) from the coastal plain of Rio Grande do Sul, southern Brazil. Cytogenetic analysis and a survey of six microsatellite loci included 101 specimens of C. minutus from the parental populations (2n/AN = 42/74 and 48a/76) and their contact zone. Cytogenetic analysis recorded 26 different karyotypes exhibited by 50 individuals from the hybrid population. Of the 26 karyotypes, only 14% presented a parental-like configuration, and none had the combinations of 2n and AN expected for an F1 hybrid. The remaining karyotypes were alternative hybrid forms, with 2n varying from 42 to 46 and AN from 68 to 80. These results suggest chromosomal rearrangements are only of minor significance in the establishment of reproductive barriers for this species.

【 授权许可】

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