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6 results for “Ctenomys minutus”
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.
Fig. 3. Karyotypes obtained from Ctenomys lami spec. nov. and C. minutus bone marrow and G in Tuco-tucos (Rodentia, Octodontidae) in Southern Brazil: Ctenomys lami spec. nov. Separated from C. minutus Nehring 1887
Fig. 3. Karyotypes obtained from Ctenomys lami spec. nov. and C. minutus bone marrow and G-banding comparison between species. (A) C. lami male karyotype in standard stain; (B) C. minutus female karyotype in standard stain; (C) Haploid set G-banding comparison between C. lami [L] and C. minutus [M].
Fig. 2 in Tuco-tucos (Rodentia, Octodontidae) in Southern Brazil: Ctenomys lami spec. nov. Separated from C. minutus Nehring 1887
Fig. 2. The cranium of Ctenomys lami spec. nov. in (A) dorsal, (B) ventral, (C) lateral view and (D) lateral view of mandible. The white bar is 20 mm.
Fig. 4 in Tuco-tucos (Rodentia, Octodontidae) in Southern Brazil: Ctenomys lami spec. nov. Separated from C. minutus Nehring 1887
Fig. 4. Distribution of Canonical Variates scores (CV) from Discriminant Analysis in 20 skull characters of ♂♂ (A) and ♀♀ (B) of the 4 populations.
Fig. 1 in Tuco-tucos (Rodentia, Octodontidae) in Southern Brazil: Ctenomys lami spec. nov. Separated from C. minutus Nehring 1887
Fig. 1. (A) Geographic distribution of Ctenomys lami spec. nov. and Ctenomys minutus in southern Brazil; (B) Area C. lami and C. minutus occupy in Rio Grande do Sul State. Collecting points of Ctenomys lami: (1) Beco dos Cegos and (2) Chico Lomã; Ctenomys minutus: (3) Cidreira Beach and (4) Osório.
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)
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