64 documents found, page 1 of 7

Comparative cytogenetics of serrasalmidae (Teleostei: Characiformes): The relat...

Made available in DSpace on 2022-04-28T19:45:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-10-01; Fundação de Amparo à Pesquisa do Estado do Amazonas; Serrasalmidae has high morphological and chromosomal diversity. Based on molecular hypotheses, the family is currently divided into two subfamilies, Colossomatinae and Serrasalminae, with Serrasalminae composed of two tribes: Myleini (comprising most ...

Comparative cytogenetic survey of the giant bonytongue arapaima fish (Osteoglos...

Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) (401962/2016?4 and 302449/2018?3 to MBC); Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo (FAPESP) (2018/22033?1 to MBC; and 2017/10240?0 to MFP); Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)/Alexander von Humboldt Foundation (88881.136128/2017?01 to MBC). project EXCELLENCE (CZ.02.1.01/0.0/0.0/ 15_003/0000460 OP).;...

Discordance in chromosome number among somatic and gonadal tissue cells of Gymn...

Mapping of ribosomal genes and chromosomal markers in three species of the genu...

Karyotypic characteristics of three species of the genus serrasalmus (S. altispinnis, S. gouldingi and S. Serrulatus) from the middle and lower Negro River, Amazon Basin, were investigated using different staining techniques and Fluorescent in situ hybridization with 5S and 18S rDNA probes. The diploid number was invariably 2n = 60 and the fundamental number was FN = 110. Nevertheless, the karyotypes differed f...

Ocorrência de dois citotipos em Serrasalmus spilopleura Kner, 1858 (characiform...

Descreve-se pela primeira vez o cariótipo de exemplares de S. spilopleura da Amazônia Central. Todos os indivíduos analisados apresentaram número diplóide igual a 60 cromossomos, em conformidade com os dados da espécie obtidos em indivíduos da bacia do Paraná-Paraguai. No entanto, dois citótipos foram encontrados em simpatria na região de confluência dos rios Negro e Solimões, os quais não estão relacionados a ...

Esterase-D and chromosome patterns in Central Amazon piranha (Serrasalmus rhomb...

This study presents additional genetic data on piranha (Serrasalmus rhombeus Linnaeus, 1766) complex previously diagnosed due to the presence of distinct cytotypes 2n = 58 and 2n = 60. Three esterase-D enzyme loci (Est-D1, Est-D2 and Est-D3) were examined and complemented with chromosomal data from 66 piranha specimens collected from Lake Catalão. For all specimens the Est-D1 and Est-D2 loci were monomorphic. I...

Comparative cytogenetics of spiny rats of the genus proechimys (Rodentia, Echim...

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=...

The Bunocephalus coracoideus species complex (Siluriformes, Aspredinidae). Sign...

Bunocephalus is the most species-rich Aspredinidae genus, corresponding to a monophyletic clade with 13 valid species. However, many species have their classification put in question. Here, we analyzed individuals from four Amazonian populations of Bunocephalus coracoideus by cytogenetic and molecular procedures. The geographic distribution, genetic distances and karyotype data indicate that each population rep...

Intriguing evidence of translocations in Discus fish (Symphysodon, Cichlidae) a...

As part of a program to understand the genetics of Amazonian ornamental fish, classical cytogenetics was used to analyze Symphysodon aequifasciatus, S. discus and S. haraldi, popular and expensive aquarium fishes that are endemic to the Amazon basin. Mitotic analyses in Symphysodon have shown some odd patterns compared with other Neotropical cichlids. We have confirmed that Symphysodon species are characterized...

Chromosomal mapping of transposable elements of the rex family in the bristleno...

Repetitive DNA sequences are present in the genome of basically every known organism, and transposable elements (TE) are one of the most representative sequences involved in chromosomal rearrangements and the genomic evolution of eukaryotes. In fish, the non-LTR retrotransposon TEs, Rex1, Rex3, and Rex6, are widely distributed in fish genomes and are the best-characterized TEs in several species. In the current...