Phylogenetic analysis of G-banded karyotypes among the South American subterranean rodents of the genus Ctenomys (Caviomorpha: Octodontidae), with special reference to chromosomal evolution and speciation

The chromosomes of subterranean rodents of the South American genus Clenomys are highly variable with diploid numbers ranging from 10 to 70. The Phylogenetic relationships of this group have been analysed cladistically using G-banded karyorypes as have the chromosomal rearrangements involved in its...

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Autor principal: Ortells, M.O
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Publicado: 1995
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100 1 |a Ortells, M.O. 
245 1 0 |a Phylogenetic analysis of G-banded karyotypes among the South American subterranean rodents of the genus Ctenomys (Caviomorpha: Octodontidae), with special reference to chromosomal evolution and speciation 
260 |c 1995 
270 1 0 |m Ortells, M.O.; GIBE, Departamento de Ciencias Biologicas, Facultad de Ciencias Exactasy Naturales, Pabellon 2, Ciudad Universitaria Nunez, 1428 Buenos Aires, Argentina 
506 |2 openaire  |e Política editorial 
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504 |a Novello, Lessa, G-band homology in two karyomorplis of' the Clenonivs pearsoni complex (Rodentia: Octodontidac) of neotropical fossorial rodents (1986) Zeitshrift Saugetierkunde, 51, pp. 378-380 
504 |a Ortells, Biologia evolutioa del gencro C'tenomys (1990) Doctoral thesis, , University of' Buenos Aires 
504 |a Ortells, Contreras, Reig, New C'tenomys karyotypes (Rodentia, Octodontidae) from north-eastern Argentina and from Paraguay confirm the extreme chromosomal multiformity of the genus (1990) Genetics, 82, pp. 189-201 
504 |a Ortells, Barrantes, Genetic distances and variability study in several species of the genus Ctenomvs (Rodentia: Octodontidae) with special reference to a probable causal role of chromosomes in speciation (1994) Biological Journal of the Linnean Society, 53, pp. 189-208 
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504 |a Reig, Massarini, Ortells, Barros, Tiranti, Dyzenchaliz, New karyotypes and C-banding patterns of the subterranean rodents of the genus Clenomys (Caviomorpha Octodontidae) from Argentina (1992) Mammalia, 56, pp. 603-623 
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504 |a Yates, Moore, Speciation and evolution in the family Talpidae (Mammalia: Insectivora) (1990) Biology of subterranean mammals al the organismal and molecular levels, pp. 1-22. , E. Nevo, O.A. Reig, Alan R. Liss, New York 
520 3 |a The chromosomes of subterranean rodents of the South American genus Clenomys are highly variable with diploid numbers ranging from 10 to 70. The Phylogenetic relationships of this group have been analysed cladistically using G-banded karyorypes as have the chromosomal rearrangements involved in its karyotypic differentiation. One group, called the 'Corrientes group', has very variable chromosomes but low allozymic and morphological differentiation among its members. This group has been analysed with respect to chromosomal speciation. Using a member of another subfamily (Octodonlomys gliroides) as an outgroup, the results indicate that karyotypes with low diploid and fundamental numbers are plesiomorphic. The range of diploid numbers studied here is between 22 and 70, while the fundamental numbers are between 40 and 86. It was found that the main chromosomal rearrangement that transforms karyotypes towards higher diploid and fundamental numbers is the acquisition of new chromosomal material via unknown mechanisms, followed by pericentric inversions that generate new chromosomal arms, centric fusions and centric fissions. In spite of their low differentiation regarding allozymic and morphological features, it was found that the karyomorphs of the Corrientes group have enough chromosomal differentiation to consider them as distinct species. Beside the range of diploid and fundamental numbers of this group (42-70 and 80-84 respectively), their pairwise chromosomal differences are high. The most closely related of them differ in one nonhomologous arm, one Robertsonian change and a whole chromosome duplication. The most differentiated taxa differ in 20 arms with lack of homology, 12 Robertsonian changes (one with monobrachial homology), six pericentric inversions and the above mentioned probable arm duplication. For these reasons, it is probable that some kind of chromosomal speciation has occurred in the Corrientes group. © 1995.  |l eng 
536 |a Detalles de la financiación: Universidad de Buenos Aires, 130 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PID No 3085300-85 
536 |a Detalles de la financiación: This work was possible thanks to the intellectual, personal and financial help of Prof. Osvaldo A. Reig, who introduced me and many others to the field of evolution. I specially thank 0. A. Scaglia for his valuable technical collaboration. J. R. Contreras and John W. Kirsch are acknowledged for providing several of the specimens studied and for help in field work. R. Barquez is also acknowledged for helping in field work. Financial support was made available by CONICET Grant PID No 3085300-85, Universidad de Buenos Aires Grant Exp. No 130, and Organization of America States Grant ‘Biosistematica de Roedores Muroideos y Caviomorfos’, all of them given to 0. A. Reig. 
593 |a GIBE, Departamento de Ciencias Biologicas, Facultad de Ciencias Exactasy Naturales, Pabellon 2, Ciudad Universitaria Nunez, 1428 Buenos Aires, Argentina 
690 1 0 |a FOSSORIAL RODENTS - CHROMOSOMES - SPECIES - CLADISTIC ANALYSIS 
773 0 |d 1995  |g v. 54  |h pp. 43-70  |k n. 1  |p Biol. J. Linn. Soc.  |x 00244066  |w (AR-BaUEN)CENRE-3388  |t Biological Journal of the Linnean Society 
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