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  • 1
    Electronic Resource
    Electronic Resource
    New evidence of a 38-chromosomes karyotype in South American populations of the roof rat,Rattus Rattus L. (rodentia, muridae) (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 225-227 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen En dos poblaciones deRattus rattus, una de Mehuin (Valdivia, Chile) y otra de Capripe (Monagas, Venezuela), se encontró un cariotipo de 2n=38 cromosomas en todos los individuos estudiados. Este cariotipo corresponde al que presentan en forma monomórfica otras poblaciones de la rata negra de América del Sur y de Italia, y diffiere del cariotipo normal de la especie, que es de 42 cromosomas. Se postula que las distintas poblaciones sudamericans deRattus rattus deben haber invadido el Continente, acompañando al hombre, en distintas irrupciones, a partir de una forma de 38 cromosomas de origen mediterráneo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935774
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  • 2
    Electronic Resource
    Electronic Resource
    Isomorphic sex-chromosomes in two venezuelan populations of the spiny rat, genusProechimys (Rodentia, Caviomorpha) (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 201-202 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen Un machoy una hembra deProechimys del Alto Orinoco (La Esmeralda) referidos aP. cherriei resultaron poseer cariotipos idénticos de 2n=26 cromosomas, sin que sea posible distinguir morfológicamente elX y elY en el macho. Un macho y 2 hembras deProechimys guyannensis guairae del Estado Aragua, proporcionaron un cariotipo de 2n=46 cromosomas, también sin par heteromórfico en el macho. Se discuten las implicaciones taxonómicas de estos hallazgos, que sugieren queP. guyannensis es una especie compleja.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895583
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  • 3
    Electronic Resource
    Electronic Resource
    The chromosomes ofMarmosa fuscata thomas, from northern Venezuela (Marsupialia, Didelphidae) (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 199-201 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen Los cromosomas deMarmosa fuscata (subgéneroMarmosops), estudiados por cultivo de tejidos en base a 4 individuos de la Cordillera de la Costa en el norte de Venezuela, resultaron diferir de los deMarmosa robinsoni sólo en el quinto y sexto par de autosomas, metacéntricos en la primera y subtelocéntricos en la segunda especie. Con todo, se encuentran mayores diferencias entre los cariotipos de estas 2 especies que entre los deM. robinsoni yCaluromys derbianus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895582
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  • 4
    Electronic Resource
    Electronic Resource
    The chromosomes of the didelphiid marsupialMarmosa robinsoni bangs (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 185-186 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'étude des chromosomes somatiques du marsupial sudaméricainMarmosa robinsoni Bangs, démontre que l'équipement chromosomique diploïde de cette espèce de la subfamille Didelphiinae est composé de 14 chromosomes. Trois paires d'autosomes sont grands et submétacentriques; 1 paire est formée par de chromosomes moyens, métacentriques, et 2 paires sont acrocentriques et plus petites. Le complexe sexuel est du typeXY, formé par unX métacentrique et unY télocentrique, tous les 2 étant les chromosomes les plus petits du complément. La similitude de ce caryotype avec celui du genreCaluromys, appartenant à la subfamille Microbiotherinae, est remarquable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02146978
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  • 5
    Electronic Resource
    Electronic Resource
    Chromosomes in four species of rodents of the genusCtenomys (Rodentia, Octodontidae) from Argentina (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 274-276 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Les chromosomes de 4 espèces de rongeurs fouisseurs du genreCtenomys de la Province de Tucumán, Argentine, ont été étudiés dans des cellules somatiques de la moelle osseuse. Le nombre diploïde est de 22 chromosomes dansC. occultus, de 28 dansC. tucumanus et de 42 dansC. latro. Un seul individu mâle deC. tucunax a présenté un complément de 2N=61.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02152816
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  • 6
    Electronic Resource
    Electronic Resource
    The occurrence of an intermediate didelphid karyotype in the short-tailed opossum (GenusMonodelphis) (1969)
    Springer
    Cellular and molecular life sciences 25 (1969), S. 1210-1211 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen Se han estudiado los cromosomas de dos especies de didélfidos del géneroMonodelphis: M. brevicaudata palliolata del norte de Venezuela yM. dimidiata de la Prov. de Buenos Aires, Argentina. Ambas especies tienen un cariotipo muy similar, compuesto de 18 cromosomas. Este cariotipo es intermedio entre el que presentanCaluromys yMarmosa (2n=14) y el deDidelphis, Philander yLutreolina (2n=22). Se postula la fisión céntrica en dos pares de submetacentricos del primer tipo, para explicar el origen del cariotipo deMonodelphis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01900283
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  • 7
    Electronic Resource
    Electronic Resource
    Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon (1988)
    Springer
    Genetica 77 (1988), S. 53-63 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosomes of 14 specimens of the genus Reithrodon from three different localities of Argentina and two localities of Uruguay were studied using G-and C-banding techniques. Specimens of Uruguay showed a karyotype of 2n=28 chromosomes having a large metacentric X, and a telocentric Y chromosome. This karyotype is very similar to that recently described in a sample from southern Brazil, differing only in the nature of the Y chromosome, which is metacentric in the Brazilian form. All specimens from Argentina showed a 2n=34 karyotype, differing from the Brazilian karyotype by two centric fusions, an acquisition of chromosome material, and at least one pericentric inversion, and by the telocentric nature of both the X and the Y chromosomes. G-and C-banding suggest that the metacentric gonosomes in the Brazilian form resulted from a double autosomal-X-Y Robertsonian translocation. The Uruguayan cytotype is interpreted as derived from a hypothetical neo-X/Y1Y2 ancestral form by the secondary loss of the Y1 chromosome. The karyotypic differences between the Brazilian-Uruguayan and the Argentinian forms afford evidence of species differentiation. It is proposed to assign the former to Reithrodon typicus, and the later to R. auritus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058549
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  • 8
    Electronic Resource
    Electronic Resource
    Chromosomal polymorphism and small karyotypic differentiation in a group of Ctenomys species from Central Argentina (Rodentia: Octodontidae) (1991)
    Springer
    Genetica 83 (1991), S. 131-144 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cytogenetic analysis was performed in six nominal taxa of the genus Ctenomys with a diploid number of 2n=47/48. The studied species were: C. australis (2n=48, FN=76); C. mendocinus (2n=47/48, FN=68/75/76); C. porteousi (2n=47/48, FN=71/72/73); C. azarae (2n=47, FN=71); C. sp. (‘chasiquensis’) (2n=47/48); and C. talarum (2n=48, FN=80). The first three species shared the whole complement, C. talarum shares with them 19 arms from a total of 43 (44%). In all species analyzed constitutive heterochromatin was detected in most short arms, and in several centromeres. Polymorphisms for several pairs involving the heterochromatic short arms together with a complex polymorphism of pair A1 were found in C. azarae, C. sp., C. mendocinus and C. porteousi. Intraindividual variation found in one specimen of C. porteousi involving heterochromatic arms is discussed. These results lead us to propose the inclusion of all species except C. talarum, within a complex called the mendocinus-group. A new case of conservatism for chromosomal number in the genus Ctenomys is found in this group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058530
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  • 9
    Electronic Resource
    Electronic Resource
    Biochemical genetics of chromosome forms of Venezuelan spiny rats of the proechimys guairae and proechimys trinitatis superspecies (1979)
    Springer
    Genetica 50 (1979), S. 89-97 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Spiny rats from Venezuela show an extensive karyotypic diversification (2n=24 to 2n=62) and little morphological differentiation. This study reports genetic distance, heterozygosity and polymorphism based upon 22 loci in semispecies and allospecies of the Proechimys guairae superspecies from N Central Venezuela, as compared with Proechimys urichi, a member of the Proechimys trinitatis superspecies from eastern Venezuela. Four chromosome forms of the P. guairae complex are included, each characterized by karyotypes of 2n=46 (Fundamental Number=72), 2n=48 (FN=72), 2n=50 (FN=72) and 2n=62 (FN=74). Proechimys urichi has a distinetive karyotype of 2n=62 (FN=88). The overall mean value of Nei's genetic identity index for all pair-wise comparisons is I=0.942±0.011. Mean identity within the P. guairae complex is Ī=0.969±0.033. Mean identity between P. urichi and members of that complex is Ī=0.889±0.011. Within the P. guairae complex, increased genetic divergence is correlated with higher karyotypic divergence. Heterozygosity varies from H=0.059 to H=0.153, with a mean value of H0.059. The mean percent of polymorphic loci is P=18.2±3.9 after the ‘0,95%’ polymorphism criterion, and P=20,5±5.2 after the ‘0.99%’ criterion. These results are compared with similar data from fossorial and non-fossorial rodents. Spiny rats are non-fossorial, forest-dwelling rodents which have undergone a speciation process with little genetic divergence and extensive chromosome rearrangements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123283
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  • 10
    Electronic Resource
    Electronic Resource
    Multiple autosomal polymorphism in populations of Akodon simulator simulator Thomas, 1916 from Tucumán, Argentina (Rodentia, Cricetidae) (1990)
    Springer
    Genetica 82 (1990), S. 165-175 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resumen Polimorfismo autosómico múltiple en poblaciones de Akodon simulator simulator Thomas, 1916 de Tucumán, Argentina (Rodentia, Cricetidae). Se realizó un análisis citogenético de 27 especímenes de Akodon simulator simulator colectados en tres localidades diferentes de la provincia de Tucumán, Argentina. Se determinó el número diploide, la morfología cromosómica y los patrones de bandeo C y G. Se encotraron 8 cariomorfos differentes, con números diploides de 2n=38, 39, 40, 41, y 42. Todos los individuos presentaron el mismo número de brazos cromosómicos (FN=42). Las bandas G permitieron identificar los pares cromosómicos (1, 10, 11, 12, 13, y 14) involucrados en tres fusiones céntricas y las bandas C revelaron que la heterocromatina está localizada en las regiones centroméricas de los cromosomas telocéntricos y de los cromosomas bibraquiados. El presente estudio nos permite analizar un nuevo ejemplo de un polimorfismo robertsoniano. Los datos son discutidos en relación con la presencia de los polimorfismos robertsonianos en la naturaleza.
    Notes: Abstract Cytogenetic analysis was performed on twenty seven specimens of Akodon simulator simulator collected in three different localities of Tucumán Province, Argentina. Diploid number, chromosomal morphology and C and G banding patterns were studied. Eight different karyomorphs were found, with diploid numbers of 2n=38, 39, 40, 41, and 42. All individuals showed the same number of chromosomal arms (FN=42). G-bands enable to identify chromosomal pairs (1, 10, 11, 12, 13, and 14) involved in three centric fusions. C-bands revealed that the heterochromatin is located in centromeric regions of the telocentric and biarmed chromosomes. The present study allowed us to document a new example of a floating multiple Robertsonian fusion polymorphism. The data are discussed in relation to the occurrence of Robertsonian polymorphism in natural populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00056359
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