Consulta: creatorFacets:"Centofante,Liano"
Registros recuperados: 7
Data/hora: 18/05/2024 17:27:19

Análise morfométrica em Thoracocharax stellatus (Kner, 1858) (Characiformes, Gasteropelecidae) proveniente de diferentes bacias hidrográficas Sul-americanas
Provedor de dados: Biota Neotropica
Autores: Silva,Edson Lourenço da; Centofante,Liano; Miyazawa,Carlos Suetoshi.
Foram utilizadas análises de variáveis canônicas livres de tamanho com o objetivo de investigar os padrões de variação morfológica entre populações de Thoracocharax stellatus em bacias hidrográficas Sul-Americanas: rios das bacias Araguaia-Tocantins e Paraguai do Brasil e Orinoco na Venezuela. Distinções entre as amostras do Araguaia-Tocantins e Orinoco foram observadas, com leve sobreposição dessas populações com as amostras da bacia do Paraguai. Os caracteres morfométricos que são os principais responsáveis por esta diversificação são comprimento da cabeça e comprimento da nadadeira dorsal. Os mecanismos que podem estar atuando nesta variação geográfica entre populações de T. stellatus são discutidos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variação geográfica; Morfometria; Variáveis canônicas; Papudinho.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000200006

Chromosomal differentiation between populations of Oligosarcus hepsetus (Teleostei, Characidae) from small tributaries at opposite margins of the Paraíba do Sul river (Brazil)
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Centofante,Liano; Bertollo,Luiz Antonio Carlos; Moreira-Filho,Orlando.
Cytogenetic analyses were carried out in two populations of Oligosarcus hepsetus from tributaries at opposite margins of the Paraíba do Sul river. The same diploid number was observed in both populations (2n=50), but they showed remarkable differences related to karyotype formula and distribution of rDNA sites as revealed by silver nitrate staining and in situ hybridization with 18S probes. The results suggested that the main channel of the Paraíba do Sul river acted as barrier to gene flow between populations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Headstream; Cytogenetic; Differentiation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700016

Chromosome polymorphism in Ancistrus cuiabae Knaack, 1999 (Siluriformes: Loricariidae: Ancistrini)
Provedor de dados: Neotropical Ichthyology
Autores: Mariotto,Sandra; Centofante,Liano; Miyazawa,Carlos S.; Bertollo,Luiz Antonio Carlos; Moreira Filho,Orlando.
Cytogenetic and FISH analyses were performed in 30 Ancistrus cuiabae specimens from a bay near the town of Poconé, in the Pantanal of Mato Grosso, Brazil. The observed diploid number was 2n = 34 chromosomes for both sexes and three distinct katyotypic formulae were found, namely cytotype A (20m, 8sm, 6st, Fundamental Number/FN = 68; 6 males and 11 females), cytotype B (19m, 8sm, 6st, 1a, FN = 67; 8 males and 4 females) and cytotype C (18m, 8sm, 6st, 2a, FN = 66; a single male). NORs's analyses showed that these regions were located in distinct sites on the NOR-bearing chromosome pair, according to cytotypes. Thus, in cytotype A, NORs were located in the terminal region of the short arm of the second metacentric chromosome pair; in cytotype B, they were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; NOR; Pericentric inversion; Chromosomal evolution.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400006

Comparative cytogenetics of Astyanax (Teleostei: Characidae) from the upper Paraguay basin
Provedor de dados: Neotropical Ichthyology
Autores: Teixeira,Thais K. S. S.; Venere,Paulo C.; Ferreira,Daniela C.; Mariotto,Sandra; Castro,Jonathan P.; Artoni,Roberto F.; Centofante,Liano.
ABSTRACT Astyanax is one of the most abundant and diverse taxa of fishes in the Neotropical region. In order to increase the amount of cytogenetic information for Astyanax as well as to exhibit data to subsidize future taxonomic studies, this work analyzed three species of Astyanax: two species are cryptic, and are here reported to live in syntopy (A. abramis and A. lacustris); the first karyotype description for A. pirapuan is also presented. Cytogenetic analyzes reveal a diploid number of 2n=50 chromosomes for three species, yet with differences in their karyotype morphology. The physical mapping of 18S rDNA showed up to thirteen sites in A. pirapuan and two in A. abramis and A. lacustris. The physical mapping of 5S rDNA has proven to be an effective...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryptic species; Fish; Karyotype; Species complex.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100214

Diversity and chromosomal evolution in the genusAncistrusKner, 1854 (Loricariidae: Ancistrini) from three hydrographic basins of Mato Grosso State, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Mariotto,Sandra; Centofante,Liano; Moreira-Filho,Orlando.
Cytogenetic analyses were carried out in 117 specimens of seven species of the genus Ancistrus from three hydrographic in Mato Grosso State: Paraguay, Araguaia-Tocantins and Amazon basins. Conventional cytogenetic techniques were used to obtain mitotic chromosomes. C-banding was performed to detect heterochromatic regions and silver nitrate staining was used to identify nucleolar organizer regions (Ag-NORs). The counted and paired chromosomes revealed diploid numbers ranging from 2n = 40 to 2n = 54 with karyotype formulae varying from FN = 80 to FN = 86. Single marks in distinct chromosomes identified the nucleolar organizer regions. The constitutive heterochromatin was scarce in the diploid number from 2n = 50 to 2n = 54 and conspicuous blocks were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AgNOR; Cytogenetic; Diploid number; Heterochromatin.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100125

Genetic structure of the ornamental tetra fish species Piabucus melanostomus Holmberg, 1891 (CHARACIDAE, IGUANODECTINAE) in the Brazilian Pantanal wetlands inferred by mitochondrial DNA sequences
Provedor de dados: Biota Neotropica
Autores: Borba,Rafael Splendore de; Silva,Edson Lourenço da; Ponzetto,Josi Margarete; Pozzobon,Allan Pierre Bonetti; Centofante,Liano; Alves,Anderson Luis; Parise-Maltempi,Patrícia Pasquali.
The subfamily Iguanodectinae comprises a group of small Neotropical fishes composed by two genera and 11 nominal species widely distributed in the Atlantic drainages of South America. Piabucus is the only genus of Iguanodectinae found in the Paraguay River basin, especially in the Pantanal of Mato Grosso State, where it is represented by Piabucus melanostomus. Given the wide distribution and the low dispersion capacity of this species, due the ecological constraints, it is possible that many interesting genetic features could be found in different populations. In this way, the aim of his work was to perform the phylogeographic pattern of P. melanostomus populations using mitochondrial DNA sequences. A total of 13 individuals from three rivers belonging the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flood pulse; Genetic diversity; Gene flow; Haplotypes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100004

Microstructural chromosome reorganization in the genus Trichomycterus (Siluriformes: Trichomycteridae)
Provedor de dados: Neotropical Ichthyology
Autores: Oliveira,Maria Lígia M. de; Utsunomia,Ricardo; Pansonato-Alves,José Carlos; Scacchetti,Priscilla C.; Primo,Cleberson C.; Vicari,Marcelo R.; Artoni,Roberto F.; Centofante,Liano; Moreira-Filho,Orlando; Oliveira,Claudio; Foresti,Fausto.
Trichomycterus is a specious fish genus within Trichomycterinae and displays remarkable karyotype diversity. However, knowledge about their genomic structure and location of repetitive sequence is still limited. In order to better understand the karyotype diversification, we analyzed nine species of Trichomycterus using classical and molecular cytogenetic techniques. Results revealed a conserved diploid chromosome number of 2n=54 chromosomes in all analyzed species, although remarkable differences on the constitutive heterochromatin distribution were observed. In addition, while the 18S rDNA showed a conserved distribution pattern, the 5S rDNA sites showed a quite diverse location considering the analyzed species. Remarkably, both ribosomal genes were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype diversity; Repetitive DNA; RDNA; Supernumerary chromosomes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200211