Data/hora: 09/06/2024 18:52:51

Provedor de dados: 	83	
País: 	Brazil	
Título: 	On the origin and diversification of Venezuelan freshwater fishes: the genus Gephyrocharax (Ostariophysi: Characidae) a case study	
Autores: 	Bonilla-Rivero,Ana; López-Rojas,Héctor.	
Data: 	2013-09-01	
Ano: 	2013	
Palavras-chave: 	Isoenzymes; Speciation; Venezuela; Vicariance.	
Resumo: 	We conducted a phylogeographic analysis of the genus Gephyrocharaxin Venezuela to evaluate geomorphologic evidence for the formation of the country's main watersheds and to establish a biogeographical hypothesis of possible diversification mechanisms of the Neotropical freshwater fish fauna. We assayed eight enzyme systems and general proteins to estimate genetic variability (H, P), intraspecific structuring in several Gephyrocharax valencia and G. venezuelae populations (FIS, FIT, and FST), and a phylogenetic approach for the three species of Gephyrocharax in Venezuela, using Corynopoma riisei as the external group. Fourteen presumptive lociindicate that populations of the three species of Gephyrocharaxanalyzed show a clear genetic inter-specific differentiation, determined by four loci with fixed alleles (GPI-B*,IDH*, ME-1*, and ME-2*). The resulting cladogram shows two major clades: a monophyletic group consisting of Gephyrocharax n. sp. and G. venezuelae(restricted to the northwest of the country) and a group formed exclusively by G. valencia (distributed along the largest geographic range). Speciation of the Venezuelan lineages of the genus Gephyrocharaxcould be explained by the origin and course movements of the present Orinoco River together with geomorphologic processes that have occurred in northern Venezuela since the Miocene.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300487	
Editor: 	Sociedade Brasileira de Ictiologia	
Relação: 	10.1590/S1679-62252013000300002	
Formato: 	text/html	
Fonte: 	Neotropical Ichthyology  v.11 n.3 2013	
Fonte: 	info:eu-repo/semantics/openAccess