Cytogenetics status of four Ctenomys species in the south of Brazil

This report is a review of 20 years of cytogenetics studies in tuco-tucos from the south of Brazil and the implications for the evolution of these species as well as the relation of these data with the geological history of the Coastal Plain of southern Brazil. Two forms of Ctenomys torquatus, 2n =...

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Bibliographic Details
Published in:Genetica 2006-01, Vol.126 (1-2), p.227-235
Main Author: de Freitas, Thales Renato O
Format: Article
Language:English
Subjects:
Animals
Brazil
Coastal plains
Ctenomys
Ctenomys torquatus
Cytogenetic Analysis
Cytogenetics
Data processing
Evolution
Genetics
Geological history
Karyotypes
Rodentia - genetics
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Summary:This report is a review of 20 years of cytogenetics studies in tuco-tucos from the south of Brazil and the implications for the evolution of these species as well as the relation of these data with the geological history of the Coastal Plain of southern Brazil. Two forms of Ctenomys torquatus, 2n = 44 and 46, are separated by a geographic barrier. Ctenomys flamarioni shows a constant karyotype (2n = 48) and presents high variability in FN due to constitutive heterochromatin variation. Ctenomys minutus presents the highest chromosomic variation among the species in the south of Brazil (2n = 42-50) with three chromosomic hybrid zones. Ctenomys lami, like C. minutus, presents a high chromosomic variation due to fusions and fissions of chromosome pairs 1 and 2. Both species present a close evolutionary relationship, including a chromosomic hybrid zone.
ISSN:0016-6707
1573-6857
DOI:10.1007/s10709-005-1451-2