Please use this identifier to cite or link to this item:
Title: Molecular signature of the D-loop in the brown pencilfish Nannostomus eques (Characiformes, Lebiasinidae) reveals at least two evolutionary units in the Rio Negro basin, Brazil
Authors: Terêncio, Maria Leandra
Schneider, Carlos Henrique
Porto, Jorge Ivan Rebelo
Keywords: Dna, Mitochondrial
Bayes Theorem
Dna Sequence
Genetic Variability
Genetics, Population
Bayes Theorem
Biological Evolution
Dna, Mitochondrial
Genetic Variation
Genetics, Population
Sequence Analysis, Dna
Nannostomus Unifasciatus
Issue Date: 2012
metadata.dc.publisher.journal: Journal of Fish Biology
metadata.dc.relation.ispartof: Volume 81, Número 1, Pags. 110-124
Abstract: The genetic variability of the brown pencilfish Nannostomus eques was studied, based on an analysis of sequences from the control region (1084 bp) of mitochondrial (mt)DNA in 125 individuals collected from eight tributaries along the upper (Açaituba, Miuá, Jaradi and Arixanã), middle (Demini), and lower (Jacundá, Maguari and Catalão) Rio Negro (Brazil). Phylogenetic inferences using mtDNA data from N. eques revealed two evolutionary units. Genetic distance between them ranged from 5·5 to 8·3% and differed by 8·5-11·8% from the sister species pencilfish Nannostomus unifasciatus. The time of divergence between the two evolutionary units was estimated to be the Middle Pliocene (c. 2·99 million years before present). Population genetic analysis (DNA polymorphism, AMOVA and Mantel test) showed high haplotype diversity (HD, >0·90) in each evolutionary unit, a strong population genetic structure in the Demini River that formed a monophyletic group and a correlation between genetic divergence and geographical distance in only one of these units (evolutionary unit 1). On the basis of molecular data, the rapids and waterfalls near São Gabriel da Cachoeira (Upper Rio Negro) were the main barriers to gene flow within evolutionary unit 1 in some localities. The emergences of the Branco River and the Anavilhanas Archipelago were apparently responsible for the discrepancy in distribution of the two evolutionary units, except at Jacundá, where the evolutionary units were sympatric. In view of the differences between the evolutionary units, N. eques cannot be treated as a single stock in the Rio Negro basin. These results may have important implications for the fishery management of this ornamental fish. © 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.
metadata.dc.identifier.doi: 10.1111/j.1095-8649.2012.03320.x
Appears in Collections:Artigos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.