https://periodicos.unespar.edu.br/index.php/luminaria/issue/feed 2023-10-05T15:52:56-03:00 Rogério Antonio Krupek rogerio.krupek@unespar.edu.br Open Journal Systems <p>A revista Luminária é um periódico semestral vinculado ao Centro de Ciências Exatas e Biológicas da Universidade Estadual do Paraná – UNESPAR, campus de União da Vitória. Trata-se de uma revista cientí­fica de caráter interdisciplinar com finalidade de publicar artigos cientí­ficos das diferentes áreas de conhecimento, incluindo as Ciências Exatas e Biológicas. Participam deste periódico cientí­fico pesquisadores de diversas Instituições, sendo que a proposta primordial é oferecer a todos os interessados um espaço para divulgação de suas produções cientí­ficas, com o foco multidisciplinar. A Revista apresenta fluxo contí­nuo para submissão de textos.</p> https://periodicos.unespar.edu.br/index.php/luminaria/article/view/8078 2023-09-05T08:48:01-03:00 Karla Letícia Ferreira karlaa.klf@gmail.com Rafael Bueno Noleto rafael.noleto@unespar.edu.br

<p>The subfamily Corydoradinae is the second largest among the callictids, comprising three genera, with <em>Corydoras</em> Lacépède, 1803 being the largest in the number of species. The genus <em>Corydoras</em> has been divided into five groups of species based on differences in diploid number, chromosomal morphology, and DNA content. Chromosome studies can provide crucial details on population differentiation. To better understand the diversification that occurs in this fish group, the current study based on such markers, presents data from a population of <em>Corydoras paleatus</em> from the first plateau of Paraná, putting them in a comparative scenario. The specimens studied has 2n=44 chromosomes with a karyotypic formula of 18m+26sm. Although conserved, this karyotypic structure shows variation in other populations of <em>C. paleatus</em> already studied, a consequence of chromosomal rearrangements that modify the morphology of chromosomes without modifying the 2n, such as centromeric repositioning. C-banding revealed conspicuous pericentromeric markings in metacentric pairs 4 and 8 and in submetacentric pairs 10 and 14, whose bands have been considered a chromosomal marker not only for <em>C. paleatus</em> but also for the genus. Fluorescent in situ hybridization (FISH) showed the major rDNA (45S) in the terminal region of the long arm of metacentric pair 5. Such location has already been described in other populations of <em>C. paleatus</em>, as they have also been mapped in short arms and with multiple patterns. The present study also provides a review of the genus <em>Corydoras</em> regarding the 2n, karyotypic formula and mainly regarding the number and location of the 45S and 5S rDNA, confirming a scenario in which chromosomal rearrangements have been modeling karyotypes of different populations and settling in the absence of gene flow, a consequence of vicariant events that occurred in the different basins.</p>

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