Journal Article10.1023/A:1024465429856
Inter and intra-specific hybridization in tuco-tucos (Ctenomys) from Brazilian coastal plains (Rodentia: Ctenomyidae).
TL;DR: In this paper, the authors describe chromosomal polymorphisms in zones of contact between divergent populations of Ctenomys minutus parapatrically distributed in the coastal plain of southern Brazil, and inter-specific hybridization with C. lami a closely related species.
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Abstract: The present work describes chromosomal polymorphisms in zones of contact between divergent populations of Ctenomys minutus parapatrically distributed in the coastal plain of southern Brazil, and inter-specific hybridization with C. lami a closely related species. A sample of 171 specimens from 32 sample sites distributed along 161 km of the coastal plain was cytogenetically analyzed. Nine polymorphic populations were found: four with specimens with 2n = 46–48 (autosomal arm number (AN) = 76); three only have specimens with 2n = 47 and 48; one population sampled presented specimens with 2n = 43–46 (AN = 74–76) and one population with 2n = 50–52 (AN = 76–80). The remainder populations were fixed for 2n = 42, 46 or 48. The variation is the result of Robertsonian mechanisms of chromosomal evolution and a fusion in tandem rearrangement. The polymorphisms have been considered the result of secondary contact of populations after divergence in allopatry. The geomorphological evolution of the coastal plain provides clues to the possible existence of past geographic barriers acting over populations of Ctenomys, during the Holocene.
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Citations
Interspecific hybridization and introgression are associated with stock transfers in salmonids
Ana G. F. Castillo,Fernando Ayllon,Paloma Morán,J. I. Izquierdo,Jose L. Martinez,Edward Beall,Eva Garcia-Vazquez +6 more
TL;DR: The results emphasize the risks associated with stock transfers and escapes of domestic individuals in wild ecosystems and illustrate the potential role of domestic stocks when they contribute to secondary contact between species.
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New Karyotypes and Some Considerations about the Chromosomal Diversification of Ctenomys minutus (Rodentia: Ctenomyidae) on the Coastal Plain of the Brazilian State of Rio Grande do Sul
TL;DR: The known geographic distribution of C. minutus is extended by 90 km, from Tavares southwards to São José do Norte, and five karyotypes are found, four of which have not previously been described for this species.
Microsatellite analysis of a hybrid zone between chromosomally divergent populations of Ctenomys minutus from southern Brazil (Rodentia: Ctenomyidae)
TL;DR: Variation at 6 microsatellite loci in 107 specimens of Ctenomys minutus from a chromosomal hybrid zone on the coastal plain of southern Brazil is described, and variation at Hai 2 locus is gradual across the zone.
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Phylogeography of the subterranean rodent Ctenomys torquatus: an evaluation of the riverine barrier hypothesis
TL;DR: The effect of the river was not proportionally larger from the headwaters to the mouth, and no population differentiation was observed after the later events of dispersal over the river or the formation of a water channel, which could result from the recent history of the occupation of C. torquatus in that region.
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The conservation status of the tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae), in southern Brazil
Fabiano Araújo Fernandes,Gabriela P. Fernandez-Stolz,Carla Martins Lopes,Thales Renato Ochotorena de Freitas +3 more
TL;DR: The conservation status of the species of tuco-tuco from southern Brazil are reviewed, and the geological history of a particular area in that region, the Coastal Plain of the States of Rio Grande do Sul and Santa Catarina is related.
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References
Geographic Variation of Chromosomal Polymorphism in Nine Populations of Ctenomys Azarae, Tuco-Tucos of the Ctenomys Mendocinus Group (Rodentia: Octodontidae)
TL;DR: Cytogenetic, morphometric, and sperm morphology studies of the mendocinus-group suggest recent allopatric speciation events, in which chromosomal rearrangements did not play a central role, are suggest.
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Cytogenetic and molecular analysis of the satellite DNA of the genus Ctenomys (Rodentia Octodontidae) from Uruguay
TL;DR: It is established that, in spite of differences in number of positive heterochromatic blocks per karyotype, the C value is the same in the three populations studied, and the nature and possible evolutionary path of this repeated DNA is discussed.
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Intraspecific craniometric Variation in a chromosome hybrid zone of Ctenomys minutus (Rodentia, Hystricognathi)
J. R. Marinho,T. R. O. Freitas +1 more
- 01 Jan 2000
TL;DR: Analysis of populations that contain hybrid forms suggest some degree of morphological divergence among cytotypes, as well as univariate and multivariate techniques.
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Chromosome Polymorphisms in Ctenomys Talarum (Rodentia, Octodontidae)
TL;DR: C-banding analysis confirmed the heterochromatic nature of the chromosome regions involved in the polymorphisms, and found that G-bands showed dimorphic pairs having deletions varying in size from one band to a whole short arm.
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