Data/hora: 01/06/2024 01:12:55

Provedor de dados: | 83
País: | Brazil
Título: | Cytogenetics of Gymnogeophagus setequedas (Cichlidae: Geophaginae), with comments on its geographical distribution
Autores: | Paiz,Leonardo M.; Baumgärtner,Lucas; Graça,Weferson J. da; Margarido,Vladimir P.; Pavanelli,Carla S.
Data: | 2017-01-01
Ano: | 2017
Palavras-chave: | Chromosomes; Conservation; Iguaçu River; Karyotype; Paraná River.
Resumo: | ABSTRACT We provide cytogenetic data for the threatened species Gymnogeophagus setequedas, and the first record of that species collected in the Iguaçu River, within the Iguaçu National Park’s area of environmental preservation, which is an unexpected occurrence for that species. We verified a diploid number of 2n = 48 chromosomes (4sm + 24st + 20a) and the presence of heterochromatin in centromeric and pericentromeric regions, which are conserved characters in the Geophagini. The multiple nucleolar organizer regions observed in G. setequedas are considered to be apomorphic characters in the Geophagini, whereas the simple 5S rDNA cistrons located interstitially on the long arm of subtelocentric chromosomes represent a plesiomorphic character. Because G. setequedas is a threatened species that occurs in lotic waters, we recommend the maintenance of undammed environments within its known area of distribution.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200211
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-20160035
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.15 n.2 2017
Fonte: | info:eu-repo/semantics/openAccess