Please use this identifier to cite or link to this item: http://repositorio.ufpa.br:8080/jspui/handle/2011/7038
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dc.creatorSILVA, Danillo dos Santos-
dc.creatorPEIXOTO, Luiz Antônio Wanderley-
dc.creatorPIECZARKA, Julio Cesar-
dc.creatorWOSIACKI, Wolmar Benjamin-
dc.creatorREADY, Jonathan Stuart-
dc.creatorNAGAMACHI, Cleusa Yoshiko-
dc.date.accessioned2015-11-30T15:11:54Z-
dc.date.available2015-11-30T15:11:54Z-
dc.date.issued2015-06-
dc.identifier.citationSILVA, Danillo dos Santos et al. Karyotypic and morphological divergence between two cryptic species of Eigenmannia in the Amazon basin with a new occurrence of XX/XY sex chromosomes (Gymnotiformes: Sternopygidae). Neotropical Ichthyology, Maringá, v. 13, n. 2, p. 297-308, jun. 2015. Disponível em: <http://www.scielo.br/pdf/ni/v13n2/1679-6225-ni-13-02-00297.pdf>. Acesso em: 19 nov. 2015. <http://dx.doi.org/10.1590/1982-0224-20140160>.pt_BR
dc.identifier.issn1982-0224-
dc.identifier.urihttp://repositorio.ufpa.br/jspui/handle/2011/7038-
dc.description.abstractEigenmannia species are widely distributed in the Neotropics, with eight valid species currently recognized. Populations of Eigenmannia from three locations in the eastern Amazon were investigated using cytogenetic and morphological techniques, revealing two taxa designated here as Eigenmannia sp. "A" and Eigenmannia sp. "B". The species differ in three morphometric characters, two meristic characters, and one osteological character. Eigenmannia sp. "A" presents 2n = 34 (22 m/sm+12 st/a) and Eigenmannia sp. "B" presents 2n = 38 (14 m/sm+24st/a) and simple differentiated sex chromosomes of the type XX/XY. In both species the Constitutive Heterochromatin (CH) rich in A-T bases is distributed in the centromeric region of all chromosomes. Eigenmannia sp. "B" also presents CH blocks in the interstitial region of chromosome pairs 8, 9 and X which are positively stained with CMA3, indicating G-C rich regions. The NOR is located on the short arm of chromosome pair 17 of Eigenmannia sp. "A" and on the short arm of pair 14 of Eigenmannia sp. "B". FISH with rDNA probes hybridized to different-sized regions between homologs, suggesting heteromorphism. The differentiation of the X chromosome in Eigenmannia sp. "B" could be the result of amplification of repetitive DNA sequences.pt_BR
dc.language.isoengpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectCitogenéticapt_BR
dc.subjectMorfologiapt_BR
dc.subjectEigenmanniapt_BR
dc.subjectItuí transparentept_BR
dc.subjectCromossomos sexuaispt_BR
dc.subjectCapanema - PApt_BR
dc.subjectSão Francisco- PApt_BR
dc.subjectPará - Estadopt_BR
dc.subjectAmazônia brasileirapt_BR
dc.titleKaryotypic and morphological divergence between two cryptic species of Eigenmannia in the Amazon basin with a new occurrence of XX/XY sex chromosomes (Gymnotiformes: Sternopygidae)pt_BR
dc.typeArtigo de Periódicopt_BR
dc.description.resumoEspécies de Eigenmannia estão amplamente distribuídas na região Neotropical, com oito espécies válidas atualmente reconhecidas. Populações de Eigenmannia de três localidades do leste da Amazônia foram investigadas usando técnicas citogenéticas e morfológicas, revelando dois táxons designados aqui comoEigenmannia sp. "A" e Eigenmannia sp. "B". As espécies diferem em três caracteres morfométricos, dois merísticos e um osteológico. Eigenmannia sp. "A" apresenta 2n = 34 (22 m/sm+12st/a) e Eigenmannia sp. "B" apresenta 2n = 38 (14 m/sm+24st/a) e cromossomos sexuais de diferenciação simples, do tipo XX/XY. Em ambas espécies a Heterocromatina Constitutiva (HC) rica em bases A-T está distribuída na região centromérica de todos os cromossomos. Eigenmannia sp. "B" também apresenta blocos de HC na região intersticial dos pares cromossômicos 8, 9 e X que coraram positivamente para CMA3, indicando regiões ricas em G-C. A NOR está localizada no braço curto do par 17 em Eigenmannia sp. "A" e no braço curto do par 14 em Eigenmannia sp. "B". FISH com sondas de rDNA hibridizaram em regiões de tamanhos diferentes entre os homólogos, sugerindo heteromorfismo. A diferenciação do cromossomo X em Eigenmannia sp. "B" pode ser o resultado de amplificação de sequências repetitivas de DNA.pt_BR
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