Data/hora: 02/06/2024 03:35:42

Provedor de dados: 	74	
País: 	Brazil	
Título: 	Comparative cytogenetics among species of the Astyanax scabripinnis complex: evolutionary and biogeographical inferences	
Autores: 	Vicari,Marcelo Ricardo; Noleto,Rafael Bueno; Artoni,Roberto Ferreira; Moreira-Filho,Orlando; Bertollo,Luiz Antonio Carlos.	
Data: 	2008-01-01	
Ano: 	2008	
Palavras-chave: 	Karyotype evolution; Cytotaxonomy; RDNA sites; Biogeography.	
Resumo: 	Karyotype data are presented for distinct species of the genus Astyanax from four rivers belonging to three different hydrographic basins of the State of Paraná, Brazil (Verde River - Tibagi basin, Açungui River - Ribeira basin, and Santo Antônio and Jaguariaíva Rivers - Jaguariaíva basin). Three karyotypic forms were identified, here denominated karyotype A (2n = 50 chromosomes, with 8m+18sm+10st+14a, and thirteen 18S rDNA sites); karyotype B (2n = 50 chromosomes, with 8m+18sm+10st+1f4a, and four 18S rDNA sites); and karyotype C (2n = 48 chromosomes, with 10m+16sm+10st+12a, and eight 18S rDNA sites). The pattern of constitutive heterochromatin was similar among the three karyotypic forms, with few differences. The 5S rDNA corresponds to a synapomorphic character regarding its number and chromosomal localization. The karyotypic form A occurs in the distribution center of the type locality of A. paranae, in the proximities of the town of Castro (Tibagi basin), and may have reached the headwaters of the Ribeira River by the breakdown of geographical barriers. The karyotypic forms B and C are sympatric and syntopic, occurring solely in the Jaguariaíva River basin. Our hypothesis is that the karyotypic form A corresponds to the species A. paranae and forms B and C correspond to other species of the A. scabripinnis complex.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200002	
Editor: 	Sociedade Brasileira de Genética	
Relação: 	10.1590/S1415-47572008000200002	
Formato: 	text/html	
Fonte: 	Genetics and Molecular Biology  v.31 n.1 suppl.0 2008	
Fonte: 	info:eu-repo/semantics/openAccess