| 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 = 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 m ... | 2006 | 16502098 |
| penial morphology in three species of brazilian tuco-tucos, ctenomys torquatus, c. minutus, and c. flamarioni (rodentia: ctenomyidae). | the present study analyses the glans penis and baculum morphology of three brazilian tuco-tucos, ctenomys torquatus lichtenstein, 1830, ctenomys minutus nehring, 1887 and ctenomys flamarioni travi, 1981, in order to identify possible variations and understand some more about this taxonomically complex group. we used fixed penis from 15 previously listed adult specimens. for a more detailed baculum analysis, the penis underwent dissection and diaphanisation, whereas to analyse the glans penis sur ... | 2013 | 23644803 |
| dna metabarcoding diet analysis for species with parapatric vs sympatric distribution: a case study on subterranean rodents. | closely related sympatric species commonly develop different ecological strategies to avoid competition. ctenomys minutus and c. flamarioni are subterranean rodents parapatrically distributed in the southern brazilian coastal plain, showing a narrow sympatric zone. to gain understanding on food preferences and possible competition for food resources, we evaluated their diet composition performing dna metabarcoding analyzes of 67 c. minutus and 100 c. flamarioni scat samples, collected along the ... | 2015 | 25649502 |
| genetic pool information reflects highly suitable areas: the case of two parapatric endangered species of tuco-tucos (rodentia: ctenomiydae). | conservation of small mammals requires knowledge of the genetically and ecologically meaningful spatial scales at which species respond to habitat modifications. conservation strategies can be improved through the use of ecological niche models and genetic data to classify areas of high environmental suitability. in this study, we applied a maxent model integrated with genetic information (nucleotide diversity, haplotype diversity and fu's fs neutrality tests) to evaluate potential genetic pool ... | 2014 | 24819251 |
| the role of chromosomal rearrangements and geographical barriers in the divergence of lineages in a south american subterranean rodent (rodentia: ctenomyidae: ctenomys minutus). | identifying factors and the extent of their roles in the differentiation of populations is of great importance for understanding the evolutionary process in which a species is involved. ctenomys minutus is a highly karyotype-polymorphic subterranean rodent, with diploid numbers ranging from 42 to 50 and autosomal arm numbers (ans) ranging from 68 to 80, comprising a total of 45 karyotypes described so far. this species inhabits the southern brazilian coastal plain, which has a complex geological ... | 2013 | 23759727 |
| a hybrid zone of the genus ctenomys: a case study in southern brazil. | we describe variation at microsatellite loci and the chromosomal polymorphisms of a hybrid population, and hybridizing populations of ctenomys minutus (the minor tuco-tuco) from the coastal plain of rio grande do sul, southern brazil. cytogenetic analysis and a survey of six microsatellite loci included 101 specimens of c. minutus from the parental populations (2n/an = 42/74 and 48a/76) and their contact zone. cytogenetic analysis recorded 26 different karyotypes exhibited by 50 individuals from ... | 2012 | 23412911 |
| 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. | the dominant mammals occupying the subterranean niche in south america are rodents of the genus ctenomys, which form a large group of 56 species with chromosome numbers ranging from 2n = 10 to 70. in southern brazil, ctenomys minutus is the species with the widest geographic distribution, inhabiting sandy fields and dunes extending from jaguaruna beach in the state of santa catarina to the town of são josé do norte in the state of rio grande do sul. eleven karyotypes (2n = 42; 2n = 46a; 2n = 46b ... | 2004 | 15330112 |
| inter and intra-specific hybridization in tuco-tucos (ctenomys) from brazilian coastal plains (rodentia: ctenomyidae). | 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); th ... | 2003 | 12903742 |
| genotoxicity biomonitoring in regions exposed to vehicle emissions using the comet assay and the micronucleus test in native rodent ctenomys minutus. | exposure to motor vehicle emissions represents an important concern for possible long-term health effects. the present report describes: 1) the application and verification of the alkaline comet assay in ctenomys minutus to detect the possible genotoxicity of automobile emissions; 2) a comparison of the comet assay results with peripheral blood micronucleus (mn) assay results performed in the same animals; and 3) the identification of agents involved in the responses and in the seasonal variatio ... | 2002 | 12489112 |
| isolation and characterization of mesenchymal stem/stromal cells from ctenomys minutus. | mesenchymal stem/stromal cells (mscs) are multipotent cells distributed in all tissues and characterized by adherence, morphology, immunophenotype and trilineage differentiation potential. the present study aimed to isolate and characterize adherent msc-like populations from different tissues of ctenomys minutus, a threatened wildlife rodent popularly known as tuco-tuco. adherent cells were isolated from bone marrow, brain, liver, pancreas and adipose tissue of three adult animals collect in sou ... | 2020 | 30508008 |