Cytotypes

Karyotypic diversity in a population of Bryconamericus aff. iheringii (Characidae)

L. L. L. da Silva, Giuliano-Caetano, L., and Dias, A. L., Karyotypic diversity in a population of Bryconamericus aff. iheringii (Characidae), vol. 13, pp. 2069-2081, 2014.

Bryconamericus comprises 56 species distributed into three groups, on the basis of the position and shape of the maxillary teeth: B. exodon, B. microcephalus and B. iheringii groups. Few cytogenetic data are available for this genus, but the diploid number of 52 chromosomes is quite common, although the karyotypic variability is extensive. This study aimed to characterize a population of B. aff. iheringii and thus contribute more cytogenetic information and better understanding of the structure and karyotypic evolution of this genus.

Comparative application of direct sequencing, PCR-RFLP, and cytogenetic markers in the genetic characterization of Pimelodus (Siluriformes: Pimelodidae) species: Possible implications for fish conservation

M. Ferreira, Bressane, K. C. O., Moresco, A. R. C., Moreira-Filho, O., Almeida-Toledo, L. F., and Garcia, C., Comparative application of direct sequencing, PCR-RFLP, and cytogenetic markers in the genetic characterization of Pimelodus (Siluriformes: Pimelodidae) species: Possible implications for fish conservation, vol. 13, pp. 4529-4544, 2014.

Pimelodus (Pimelodidae) is a genus comprising a group of South American species with complex taxonomic relationships. Cytogenetics, polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP), and sequencing data of mitochondrial genes were analyzed to characterize 4 Pimelodus species: P. fur, P. heraldoi, P. maculatus, and Pimelodus sp. All populations presented 2n = 56 chromosomes and distinct karyotypic formulae.

Is there a relationship between polyploidy and stressful environments? A case study of inselbergs in northeastern Brazil

S. R. Pitrez, Andrade, L. A., Assis, F. N. M., and Felix, L. P., Is there a relationship between polyploidy and stressful environments? A case study of inselbergs in northeastern Brazil, vol. 13, pp. 8353-8366, 2014.

The aim of this study was to examine the hypothesis that plants with higher ploidy levels are selected by environments under more extremely stressful conditions than the same (or closely related) species from less rigorous terrestrial or epiphytic habitats. Therefore, we analyzed the chromosome numbers of 26 species belonging to 21 genera and 13 families of angiosperms that were collected on 4 inselbergs in Paraiba State, northeastern Brazil.

Comparative cytogenetics of spiny rats of the genus Proechimys (Rodentia, Echimyidae) from the Amazon region

E. S. Eler, da Silva, M. N. F., Silva, C. E. F., and Feldberg, E., Comparative cytogenetics of spiny rats of the genus Proechimys (Rodentia, Echimyidae) from the Amazon region, vol. 11, pp. 830-846, 2012.

We made a comparative analysis of the cytogenetics of spiny rat species of the genus Proechimys collected from several sites of the Madeira River basin (Amazonas State, Brazil) and Jari River valley (Pará State, Brazil). Individuals were assigned to three groups based on diploid and fundamental numbers: 2n = 28, FN = 46 (P. cuvieri and P. gr. longicaudatus); 2n = 38, FN = 52 (Proechimys gr. guyannensis), and 2n = 40, FN = 54 (P. gardneri).

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