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108 results for “Ctenomyidae”
Figura 3 in Primer Ctenomys provincia registro de coloración melánica en famosus (Rodentia: Ctenomyidae) en la de La Rioja, Argentina
Figura 3. Fotografías del ejemplar de Ctenomys famosus con patrón de coloración melánico. A) Vista dorsal. B) Vista ventral. C) Individuo en el ambiente natural, donde se ve el contraste de los colores del pelaje y del suelo. Figure 3. Photographs of the specimen of Ctenomys famosus with melanic color pattern. A) Dorsal view. B) Ventral view. C) Individual in the natural environment, where the contrast of the colors of the pelage and the soil is seen.
Figura 2 in Primer Ctenomys provincia registro de coloración melánica en famosus (Rodentia: Ctenomyidae) en la de La Rioja, Argentina
Figura 2. Ubicación geográfica del sitio de muestreo (ícono naranja) donde se capturó ejemplar melánico de Ctenomys famosus. Figure 2. Geographic location of the sampling site (orange icon) where the melanic specimen of Ctenomys famosus was captured.
Figura 1 in Primer Ctenomys provincia registro de coloración melánica en famosus (Rodentia: Ctenomyidae) en la de La Rioja, Argentina
Figura 1. Fotografías de Ctenomys famosus con coloración agoutí característica de la especie. a) Vista dorsal. b) Vista ventral. c) Cachorro capturado junto a hembra Melanica. d) Fotografía del área de muestreo, se observa características ambientales de la zona. Figure 1. Photographs of Ctenomys famosus with agoutí coloration characteristic of the species. a) Dorsal view. b) Ventral view. c) Puppy captured together with the melanic female. d) Photograph of the sampling area, environmental characteristics of the area are observed.
FIGURE 3 in Reassessing the causal connection between satDNA dynamics and chromosomal evolution in Ctenomys (Rodentia, Ctenomyidae): Unveiling the overlooked importance of the Y chromosome
FIGURE 3 Ancestral RPCS copy number reconstruction. RPCS copy number was mapped along the mtDNA phylogeny using the phytools function anc.ML, for males and females of the Ctenomys Corrientes group separately. The projection of the reconstruction onto the edges of the tree was made with the function contMap. RPCS copy number is expressed as thousands of copies. The scale of the tree is expressed in substitutions per site. Letters A–D correspond to the four main clades of the group.
FIGURE 2 in Reassessing the causal connection between satDNA dynamics and chromosomal evolution in Ctenomys (Rodentia, Ctenomyidae): Unveiling the overlooked importance of the Y chromosome
FIGURE 2 Geographic distribution of mean RPCS copy number. The Corrientes group lineages are surrounded by dashed lines. Locality numbers are: 1 – San Alonso, 2 – Loreto, 3 – Contreras_Cué, 4 – Estancia La Tacuarita, 5 – Saladas Sur, 6 – Saladas, 7 – Santa Rosa, 8 – San Roque, 9 – Estancia San Luis, 10 – Pago Alegre, 11 – Mbarigüí, 12 – Paraje Angostura, 13 – Goya, 14 – Chavarría, 15 – Colonia 3 de abril, 16 – Rincón de Ambrosio.
FIGURE 1 in Reassessing the causal connection between satDNA dynamics and chromosomal evolution in Ctenomys (Rodentia, Ctenomyidae): Unveiling the overlooked importance of the Y chromosome
FIGURE 1 Differences in RPCS copy number in males and females. Scatter plot showing differences in RPCS copy numbers between males and females of the Ctenomys Corrientes group, expressed as thousands of copies. Clades A-D correspond to the four different clades of the phylogeny (figs 3 and 4). A smoothing function was applied with the package ggplot2.
FIGURE 4 in Reassessing the causal connection between satDNA dynamics and chromosomal evolution in Ctenomys (Rodentia, Ctenomyidae): Unveiling the overlooked importance of the Y chromosome
FIGURE 4 Ancestral reconstruction of diploid numbers (2n) and main RPCS reductions and amplifications in the Ctenomys Corrientes group. Ancestral diploid numbers were inferred with the ChromEvol model implemented in RevBayes, over the mtDNA Bayesian phylogeny of the Corrientes group. Numbers in internal nodes/ terminals represent inferred/observed 2n. Colored circles depict 2n (size) and posterior probability of the inferred value (color). Red and green branches depict significant reductions and amplifications in diploid numbers, respectively. Smaller equal-sized black circles show well-supported nodes (posterior probability> 0.75). Black arrowheads denote a marked increase/decrease in RPCS copy numbers (inferred from females). The scale bar is expressed in substitutions per site.
Figure 7 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 7. Phenogram computed from the Mahalanobis distances between chromosomal groups for Ctenomys torquatus from Brazil (2n = 40, 44, and 46), C. torquatus from Uruguay (2n = 44u), and Ctenomys pearsoni (2n = 66 and 70). Tree made by using the neighbour-joining method with branch lengths proportional to morphological distances. Scale bar: 4 units.
Figure 4 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 4. Kernel density estimates on principal components (PC) 1 and 2 of shape variables and convex hulls for specimens of Ctenomys torquatus (•) and Ctenomys pearsoni (Δ). Variance percentages are given on the y axis. Dark areas indicate higher density regions.
Figure 6 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 6. Plot of the six chromosomal populations for the first two axes of the linear discriminant analysis (LDA) for three integrated views. Ctenomys torquatus, 2n = 40, 44, 44u, and 46; Ctenomys pearsoni, 2n = 66 and 70.
Figure 3 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 3. Box-and-whisker plots showing the distribution of centroid size for the lateral view of the skull of two Ctenomys torquatus and Ctenomys pearsoni specimens, and for each sex. Upper and lower hinges correspond to the first and third quartiles, and whiskers correspond to the 95% confidence interval.
Figure 2 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 2. Ctenomys torquatus skull, with indication of morphological landmarks for the dorsal (A), ventral (B), and lateral (C) views of the cranium. Appendix 2 gives the key to the landmarks. Scale bar: 1 cm.
Data from: 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 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 history, with several potential geographical barriers acting on different time scales. We assessed the geographical genetic structure of C. minutus, examining 340 individuals over the entire distributional range and using information from chromosomal rearrangements, mitochondrial DNA (mtDNA) sequences, and 14 microsatellite loci. The mtDNA results revealed 7 main haplogroups, with the most recent common ancestors dating from the Pleistocene, whereas clustering methods defined 12 populations. Some boundaries of mtDNA haplogroups and population clusters can be associated with potential geographical barriers to gene flow. The isolation by distance pattern also plays an important role in fine-scale genetic differentiation, which is strengthened by the narrowness of the coastal plain and by common features of subterranean rodents (i.e., small fragmented populations and low dispersal rates), which limit gene flow among populations. A step-by-step mechanism of chromosomal evolution can be suggested for this species, mainly associated with the metapopulation structure, genetic drift, and the geographical features of the southern Brazilian coastal plain. However, chromosomal variation plays no or very little role in the diversification of C. minutus populations.
Distribution. CW Argentina (S Neuquén Province), in a narrow area between the Rio Traful and Nahuel Huapi Lake, W of the Rio Limay. in Ctenomyidae
Distribution. CW Argentina (S Neuquén Province), in a narrow area between the Rio Traful and Nahuel Huapi Lake, W of the Rio Limay.
Distribution. NC Argentina (NW Cordoba Province), in a small area comprising 500 m*along the course of Rio Cruz del Eje. in Ctenomyidae
Distribution. NC Argentina (NW Cordoba Province), in a small area comprising 500 m*along the course of Rio Cruz del Eje.
On following pages: 48. Paraguayan Tuco-tuco (Ctenomys paraguayensis); 49. Pilar Tuco-tuco (Ctenomys pilarensis (Ctenomys coludo); 53. Famatina Tuco-tuco (Ctenomys famosus); 54. Foch's Tuco-tuco (Ctenomys fochi); 55. Jujuy tuconax); 58. Monte Tuco-tuco (Ctenomys viperinus); 59. Santa Fe Tuco-tuco (Ctenomys " yolandae"); 60. Azara's johannis); 63. Osvaldo Reig's Tuco-tuco (Ctenomys osvaldoreigi); 64. Brown Tuco-tuco (Ctenomys pontifex); 65. Rosendo Guaymallen Tuco-tuco (Ctenomys validus); 68. Emilio's Tuco-tuco (Ctenomys emilianus); 69. Colonial Tuco-tuco (Ctenomys); 50. Maule Tuco-tuco (Ctenomys maulinus); 51. Bonetto's Tuco-tuco (Ctenomys bonettol); 52. Puntilla Tuco-tuco Tuco-tuco (Ctenomysjuris); 56. Catamarca Tuco-tuco (Ctenomys knight); 57. Robust Tuco-tuco (Ctenomys Tuco-tuco (Ctenomys azarae); 61. Cordoba Tuco-tuco (Ctenomys berg); 62. San Juan Tuco-tuco (Ctenomys Pascual's Tuco-tuco (Ctenomys rosendopascuali); 66. Sierra Tontal Tuco-tuco (Ctenomys tulduco); 67. sociabilis). in Ctenomyidae
On following pages: 48. Paraguayan Tuco-tuco (Ctenomys paraguayensis); 49. Pilar Tuco-tuco (Ctenomys pilarensis (Ctenomys coludo); 53. Famatina Tuco-tuco (Ctenomys famosus); 54. Foch's Tuco-tuco (Ctenomys fochi); 55. Jujuy tuconax); 58. Monte Tuco-tuco (Ctenomys viperinus); 59. Santa Fe Tuco-tuco (Ctenomys " yolandae"); 60. Azara's johannis); 63. Osvaldo Reig's Tuco-tuco (Ctenomys osvaldoreigi); 64. Brown Tuco-tuco (Ctenomys pontifex); 65. Rosendo Guaymallen Tuco-tuco (Ctenomys validus); 68. Emilio's Tuco-tuco (Ctenomys emilianus); 69. Colonial Tuco-tuco (Ctenomys); 50. Maule Tuco-tuco (Ctenomys maulinus); 51. Bonetto's Tuco-tuco (Ctenomys bonettol); 52. Puntilla Tuco-tuco Tuco-tuco (Ctenomysjuris); 56. Catamarca Tuco-tuco (Ctenomys knight); 57. Robust Tuco-tuco (Ctenomys Tuco-tuco (Ctenomys azarae); 61. Cordoba Tuco-tuco (Ctenomys berg); 62. San Juan Tuco-tuco (Ctenomys Pascual's Tuco-tuco (Ctenomys rosendopascuali); 66. Sierra Tontal Tuco-tuco (Ctenomys tulduco); 67. sociabilis).
Distribution. NW Argentina (Tucuman Province), two disjunct populations in the Nevados de Aconquija. in Ctenomyidae
Distribution. NW Argentina (Tucuman Province), two disjunct populations in the Nevados de Aconquija.
Distribution. CW Argentina (N Neuquén Province), known only from the type locality and neighboring areas in the Chos Malal Department. in Ctenomyidae
Distribution. CW Argentina (N Neuquén Province), known only from the type locality and neighboring areas in the Chos Malal Department.
Distribution. NW Argentina (SW Catamarca Province), known only from the vicinity ofthe type locality. in Ctenomyidae
Distribution. NW Argentina (SW Catamarca Province), known only from the vicinity ofthe type locality.
Distribution. NW Argentina (La Rioja Province), occurs at the type locality and probably nearby areas, in Sierra de Famatina, reaching elevations up to 3800 m. in Ctenomyidae
Distribution. NW Argentina (La Rioja Province), occurs at the type locality and probably nearby areas, in Sierra de Famatina, reaching elevations up to 3800 m.
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