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

AUTOR(ES)

Castilho, Camila S., Gava, Adriana, Freitas, Thales R.O. de

FONTE

Genet. Mol. Biol.

DATA DE PUBLICAÇÃO

2012

RESUMO

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.

Documentos Relacionados

• The conservation status of the tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae), in southern Brazil
• Aquatic vascular plants as handicraft: a case study in southern Brazil
• Risks associated with a double-cropping production system - a case study in southern Brazil
• Performance of the AquaCrop model for the wheat crop in the subtropical zone in Southern Brazil
• The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes