Allozyme variation among three populations of the armored catfish Hypostomus regani (Ihering, 1905) (Siluriformes, Loricariidae) from the Paraná and Paraguay river basins, Brazil

Abstract

Three Brazilian populations of the armored catfish Hypostomus regani (Ihering, 1905) were sampled, one from the Corumbá Reservoir in Goiás state, another from the Itaipu Reservoir in Paraná state and a third from the Manso Reservoir in Mato Grosso state. Allozyme electrophoresis was used to establish the genetic structure of the species, with the analysis of liver, heart and muscles tissues allowing the scoring of 25 loci from 14 enzymatic systems. Although no diagnostic loci were found, some exclusive rare alleles were recorded for the three populations. The genetically most similar populations were those from Corumbá and Itaipu, and the most distant were the populations from Manso and Corumbá. The allozyme data showed three structured populations belonging to the same species H. regani (F ST = 0.173).

<b>Allozyme analysis of the four species of <i>Hypostomus</i> (Teleostei: Loricariidae) from the Ivaí river, upper Paraná river basin, Brazil</b> - doi: 10.4025/actascibiolsci.v35i4.16355

“…1/NUP 5612 (0.126), H. hermanni (0.199) and H. regani (0.085) in this work, different from H. albopunctatus, were considerably higher than the average found by Ward et al (1992Ward et al ( , 1994. The value of He in H. regani from the Corumbá reservoir (0.056) (ZAWADZKI et al, 2008c) were slightly above the average of Ward et al (1992Ward et al ( , 1994, while the population of H. regani from the Itaipu reservoir presented He value higher than the average, 0.078 (ZAWADZKI et al, 2008b). These H. regani populations were previously isolated by several waterfalls along the Paraná river and, currently by several reservoirs.…”

“…An analysis of the same both species, but from the Itaipu reservoir by Zawadzki et al (2005), presented practically the same distance between them (D = 0.219), despite a greater number of enzymatic systems (14) and loci number (25) that have been analyzed in that study. Zawadzki et al (2005) also found that H. albopunctatus and H. regani from Itaipu reservoir were genetically similar (I = 0.803), as well as H. albopunctatus and H. regani from the Ivaí river in the present work (I = 0.804). This data corroborates the statement of Thorpe and Solé-Cava (1994), that there is a clear relationship between taxonomic divergence and genetic distance.…”

Taxonomic status of two morphotypes of Coryphaena hippurus (Perciformes: Coryphaenidae)

“…Other studies have estimated the gene identity between fish groups using the allozyme electrophoresis method and have associated values of I greater than 0.85 within populations of the same species (Zawadzki et al, 2008;Erdoğan et al, 2009).…”

A new unicuspid-toothed species of HypostomusLacépède, 1803 (Siluriformes: Loricariidae) from the rio Paraguai basin

“…There are 11 nominal valid species described from the rio Paraguai basin: H. cochliodon (Kner) Zawadzki, Weber & Pavanelli, and H. careopinnatus Martins, Marinho, Langeani & Serra. In addition, H. regani (Ihering), originally described from the upper rio Paraná basin also occurs in the upper rio Paraguai basin (Weber et al, 1992;Veríssimo et al, 2005;Zawadzki, Renesto, Peres & Paiva, 2008).…”