Chromosome multiformity in the genus Ctenomys (Rodentia, Octodontidae)

Reig, Osvaldo A.; Kiblisky, P.

doi:10.1007/bf00331531

Cited by 100 publications

(79 citation statements)

References 27 publications

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“…These rodents have undergone enormous levels of chromosomal evolution with diploid numbers varying from 2n = 10 to 2n = 70, mainly due to Robertsonian translocations, but also heterochromatin additions/losses, pericentric inversions and/or tandem fusions had been postulated (Reig and Kiblisky 1969, Cook et al 1990, Massarini et al 1991, Freitas 2006, Novello and Villar 2006, Caraballo et al 2015. Their subterranean lifestyle has been associated to high population subdivision and low vagility which may have promoted the fixation of chromosomal novelties by genetic drift Kiblisky 1969, Ortells 1995).…”

Section: Introductionmentioning

confidence: 99%

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Caraballo

Rossi

2017

Mammalia

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Abstract:The tuco-tucos rodents (genus Ctenomys) of the Corrientes group comprise several populations that inhabit the vast area under the influence of the Iberá wetland. Lineage delimitation within the recently diverged Corrientes group is a challenging task as morphological differentiation is not conspicuous between populations. However, delimitation is crucial for evolutionary studies and conservation issues. In this study, we performed a phylogenetic analysis including cytochrome b (cyt-b) sequences from taxa that had never been studied in a comprehensive context. We integrated previously published chromosomal studies, mitochondrial phylogenies and simple sequence repeat (SSR) variability analyses, and applied a delimitation criterion over the basis of chromosomal incompatibilities and genetic exclusivity. Under this integrative approach seven independently evolving lineages were delimited in the Corrientes group: Ctenomys roigi, which conserves its former definition, Ctenomys dorbignyi and Ctenomys perrensi complex which were redefined, Sarandicito which includes the population of Paraje Sarandicito and probably a group of nearby poorly studied populations, and Iberá i, ii and iii distributed at both sides of the Iberá wetland. We discuss future perspectives to evaluate the proposed lineages and conservation issues concerning these tuco-tucos.

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Section: Introductionmentioning

confidence: 99%

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Caraballo

Rossi

2017

Mammalia

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“…The Ctenomys genus from South America exhibits the greatest karyotypic variations registered in mammals, with diploid numbers ranging from 2n = 10 to 2n = 70 (Reig and Kiblisky 1969;Gallardo 1979;Anderson et al 1987;Novello and Lessa 1986;Cook et al 1990;Novello et al 1990;Massarini et al 1991;Villar et al 2005). The high variability of this genus contrasts with other related genera of the family Octodontidae which exhibit less karyotypic variation: Spalacopus cyanus 2n = 58, fundamental number (FN) = 108, Aconaemys fuscus, 2n = 56, FN = 106 (Venegas 1975); Octodon degus, 2n = 58, FN = 108 (Fernandez 1968) and Octodontomys gliroides, 2n = 38, FN = 62 (George and Weir 1972).…”

Section: Introductionmentioning

confidence: 99%

“…The wide variation recorded in karyotypes of the genus Ctenomys is the result of different chromosomal rearrangements including Robertsonian translocations, pericentric inversions, and heterochromatin variation (Reig and Kiblisky 1969;Novello and Lessa 1986;Cook et al 1990;Villar et al 2005). In Uruguay, three nominal species have been described: Ctenomys pearsoni, 2n = 70 (Lessa and Langguth 1983) distributed in the southwest; Ctenomys torquatus, 2n = 44 (Reig and Kiblisky 1969;Freitas and Lessa 1984) located in the north; and Ctenomys rionegrensis, 2n = 50 (Reig and Kiblisky 1969) situated in the west of the country.…”

Section: Introductionmentioning

confidence: 99%

“…In Uruguay, three nominal species have been described: Ctenomys pearsoni, 2n = 70 (Lessa and Langguth 1983) distributed in the southwest; Ctenomys torquatus, 2n = 44 (Reig and Kiblisky 1969;Freitas and Lessa 1984) located in the north; and Ctenomys rionegrensis, 2n = 50 (Reig and Kiblisky 1969) situated in the west of the country. The species that inhabit the coast of the Río de la Plata constitutes a complex called "Ctenomys pearsoni complex" due to the cranial and penial similarities in morphology features respect to C. pearsoni species.…”

Section: Introductionmentioning

confidence: 99%

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G-banding patterns of the genusCtenomysfrom Uruguay (Rodentia Ctenomydae): high karyotype variation but chromosome arm conservation

2014

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The genus Ctenomys present a wide 2n and fundamental number (FN) variation in Uruguay and throughout their distribution across the south of the Neotropical region. In this study we analyze chromosome variation of this genus in Uruguay using G and C bands. G-band comparison makes clear that this chromosome variation is reduced if we take into account entire chromosomes and chromosome arms homologies. This could be explained as an adaptation to chromosome variation (2n and FN) without changing gene order or linkage groups. On the other hand, C-banding showed a high variability in amount and localization in the karyotypes analyzed here. These differences could be due to differential amplification of the repetitive DNA (RPSC) characteristic of this genus. Nevertheless, other mechanisms could be involved as repetitive DNA interchange at the chromocenters in the meiosis pachytene, where non homologous chromosomes meet. In this scenario, chromosome rearrangements such as Robertsonian translocations and whole chromosome conservation are of particular interest since these provide a way to conserve gene order. Why Ctenomys chromosomes are prone to rearrangements is not clear, albeit several mammal species present a similar picture. This kind of chromosome change could be involved in the maintenance of chromosome order at the nuclear level. In this paper, we present evidence showing that chromosome and genetic changes are not unavoidably related in Ctenomys, which questions the hypothesis about speciation based on chromosomal changes.

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“…Subterranean rodents, particularly South American tuco-tucos (genus Ctenomys), have attracted special interest in the literature on speciation and evolution, by virtue of their patchy distributions, low vagility, territoriality, and extensive karyotype variation (Reig et al, 1990). The first forms of Ctenomys are recorded to the end of the Pliocene, in central Argentina (Reig and Kiblisky, 1969;Vucetich et al, 1999;Verzi, 2002). Their adaptation to the fossorial habitat, with small physical and ecological variations, allowed the genus to explosively radiate and occupy many different environments.…”

Section: Introductionmentioning

confidence: 99%

The conservation status of the tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae), in southern Brazil

et al. 2007

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The goal of conservation biology should be related to the preservation of species and also to the evolutionary and ecological processes that were responsible to form them and that are still acting. We review the conservation status of the species of tuco-tuco (Ctenomys torquatus, C. lami, C. minutus, and C. flamarioni) from southern Brazil, and relate these data to the geological history of a particular area in that region, the Coastal Plain of the States of Rio Grande do Sul and Santa Catarina. The implications of the data on these species from the Southeastern Brazil are also discussed in relation to the evolution and risk of extinction of these subterranean rodents.Keywords: Ctenomys, subterranean rodents, hybrid zones, threatened species, Coastal Plain of Rio Grande do Sul. O status da conservação dos tuco-tucos, gênero Ctenomys(Rodentia: Ctenomyidae), no sul do Brasil ResumoO objetivo da biologia da conservação deve estar relacionado com a preservação das espécies e também com os processos evolutivos e ecológicos que foram responsáveis por sua formação e que continuam ocorrendo. Este trabalho revisa o status de conservação das espécies de tuco-tuco (Ctenomys torquatus, C. lami, C. minutus e C. flamarioni) do sul do Brasil, assim como a relação entre estas informações e a história geológica de uma região de especial importância, a planície costeira dos Estados do Rio Grande do Sul e Santa Catarina. São também discutidas as implicações do conhecimento acumulado sobre as espécies de tuco-tuco no sul do Brasil em relação aos aspectos evolutivos e a ameaça de extinção que estas espécies de roedores subterrâneos sofrem.Palavras-chave: Ctenomys, roedores subterrâneos, zonas híbridas, espécies ameaçadas, planície costeira do Rio Grande do Sul.

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Chromosome multiformity in the genus Ctenomys (Rodentia, Octodontidae)

Cited by 100 publications

References 27 publications

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

G-banding patterns of the genusCtenomysfrom Uruguay (Rodentia Ctenomydae): high karyotype variation but chromosome arm conservation

The conservation status of the tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae), in southern Brazil

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