Comparative chromosomal analysis and phylogeny in four Ctenomys species (Rodentia, Octodontidae)

García, Luis Fernando

doi:10.1006/bijl.1999.0314

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…In addition, when included into the cyt-b phylogeny, the populations of San Joaquín de Miraflores and Paso Vera fall into the clade containing the Ctenomys pearsoni complex (Figure 3), as occurs with the also Entrerrianan population of Médanos which also has a FN = 88 (García et al 2000a), confirming these populations are not members of the Corrientes group. The northern (Mbarigüí and Paraje Angostura) and the southern (Paraje Sarandicito) nucleuses split apart in the basal clades of the Corrientes group (Figure 3), and also form unique separate SSR clusters (Table 1, see below).…”

Section: Ctenomys Dorbignyimentioning

confidence: 90%

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: Ctenomys Dorbignyimentioning

confidence: 90%

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Caraballo

Rossi

2017

Mammalia

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“…As currently understood, the species is distributed in southern Uruguay in a narrow band along the coast of the La Plata River and the Atlantic Ocean (Tomasco and Lessa, 2007). In addition, some isolated populations in Entre Ríos, Argentina are assigned to this species (García et al, 2000); however, their assignment has not been rigorously tested. C. pearsoni presents a large amount of chromosomal variation, which is geographically structured (Novello and Altuna, 2002 and citations therein).…”

Section: Discussionmentioning

confidence: 99%

Incongruent patterns of morphological, molecular, and karyotypic variation among populations of Ctenomys pearsoni (Rodentia, Ctenomyidae)

D’Anatro

D’Elı́a

2011

Mammalian Biology

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a b s t r a c tThe genus Ctenomys of subterranean rodents is one of the most diverse of the mammal radiation. In addition to external and skull morphology, studies of Ctenomys alpha taxonomy have relied in an intense manner on chromosomal variation and several populations of this genus have been characterized only by means of cytogenetic techniques.Ctenomys pearsoni is the most karyotypically variable species of the genus (2n =56-70). The goal of this study was to assess the pattern of geographic variation of the skull morphology in several karyomorphs of Ctenomys pearsoni. Our main results indicate that, with the exception of the Solís karyomorph, the remaining are morphologically indistinguishable. These results also agree with previous morphological and population genetics analyses performed in this species. Taken together the available evidence, we support the point of view that not all fixations of chromosomal rearrangement define independent evolutionary units.

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“…Although the role of heterochromatin remains speculative (John 1988, Wallrath 1998, Slamovits et al 2002, it has been suggested that variation in quantity and distribution of heterochromatic regions could be responsible for a substantial part of the chromosomal variability observed within and between species (Redi et al 1990, Garagna et al 2001, although no conclusive evidence exists for this presumed relationship (Patton and Sherwood 1983, John 1988, King 1993). Three hypotheses have been proposed for heterochromatin dynamics in Ctenomys: (1) Tendency toward increase (Gallardo 1991, Reig et al 1992), (2) Tendency toward deletion (García et al 2000), and (3) A bi-directional dynamic with intraclade amplifications and deletions (Slamovits et al 2001). None of these hypotheses can be verified if not tested against a phylogenetic framework.…”

Section: Discussionmentioning

confidence: 99%

“…In C. rionegrensis of the same lineage, AluI treatment failed to digest C-heterochromatin (García et al 2000); thus, we assume that the repetitive sequence present in this lineage is different to that in RPCS. However, dot-blot experiments of C. rionegrensis DNA revealed the presence of 3.2´10 6 copies of RPCS (Slamovits et al 2001).…”

Section: Lineage Characterizationmentioning

confidence: 92%

“…Although there is lack of conclusive evidence that chromosomal rearrangements cause speciation, rearrangements certainly can reinforce post-mating reproductive isolation independently of their mode of origin (Coghlan et al 2005). Karyotypic diversification of tuco-tucos includes variation in heterochromatin and satellite DNA as revealed by comparative studies of C-banding and restriction banding (RE), as well as molecular analyses (Reig et al 1992, García et al 2000, Ipucha 2002, Slamovits and Rossi 2002, Novello and Villar 2006. Heterochromatin and satellite DNA have been suggested to be important agents of chromosomal repatterning Rossi 2002, Cook andSalazar-Bravo 2004).…”

Section: Introductionmentioning

confidence: 99%

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Heterogeneity of heterochromatin in six species ofCtenomys (Rodentia: Octodontoidea: Ctenomyidae) from Argentina revealed by a combined analysis of C- and RE-banding

2008

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2008. Heterogeneity of heterochromatin in six species of Ctenomys (Rodentia: Octodontoidea: Ctenomyidae) from Argentina revealed by a combined analysis of C-and RE-banding. Acta Theriologica 53: 57-71.Exceptional chromosomal variability makes Ctenomys an excellent model for evolutionary cytogenetic analysis. Six species belonging to three evolutionary lineages were studied by means of restriction endonuclease and C-chromosome banding. The resulting banding patterns were used for comparative analysis of heterochromatin distribution on chromosomes. This combined analysis allowed intra-and inter-specific heterochromatin variability to be detected, groups of species belonging to different lineages to be characterized, and phylogenetic relationships hypothesized from other data to be supported. The "ancestral group", Ctenomys pundti and C. talarum, share three types of heterochromatin, the most abundant of which was also found in C. aff. C. opimus, suggesting that the latter species also belongs to the "ancestral group". Additionally, within the subspecies C. t. talarum, putative chromosomal rearrangements distinguishing two of the three chromosomal races were identified. Two species belong to an "eastern lineage", C. osvaldoreigi and C. rosendopascuali, and share only one type of heterochromatin homogeneously distributed across their karyotypes. C. latro, the only analyzed species from the "chacoan" lineage, showed three types of heterochromatin, one of them being that which characterizes the "eastern lineage". C. aff. C. opimus, because of its low heterochromatin content, is the most primitive karyotype of the genus yet described. The heterochromatin variability showed by these species, reflecting the evolutionary divergence toward different heterochromatin types, may have diverged since the origin of the genus. Heterochromatin amplification is proposed as a trend within Ctenomys, occurring independently of chromosomal change in diploid numbers.

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Comparative chromosomal analysis and phylogeny in four Ctenomys species (Rodentia, Octodontidae)

Cited by 7 publications

References 9 publications

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Incongruent patterns of morphological, molecular, and karyotypic variation among populations of Ctenomys pearsoni (Rodentia, Ctenomyidae)

Heterogeneity of heterochromatin in six species ofCtenomys (Rodentia: Octodontoidea: Ctenomyidae) from Argentina revealed by a combined analysis of C- and RE-banding

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