Chromosomal differentiation between populations of Oligosarcus hepsetus (Teleostei, Characidae) from small tributaries at opposite margins of the Paraíba do Sul river (Brazil)

Centofante, Liano; Bertollo, Luiz Antônio Carlos; Moreira‐Filho, Orlando

doi:10.1590/s1516-89132006000700016

Cited by 11 publications

(5 citation statements)

References 17 publications

(14 reference statements)

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“…(2001), whereas in T. khudree the number of NORs was different, which may be due to population differences. Similar NOR number polymorphism was reported by Centofante et al . (2006) in Oligosarcus hepsetus (Cuvier) while working with Grande Stream (two pairs) and Santo Antonio Stream (three pairs) populations of the middle Paraiba do Sul River and by Barat et al .…”

Section: Discussionsupporting

confidence: 91%

Karyotypic diversity and evolution of seven mahseer species (Cyprinidae) from India

Mani

Kumar

Singh

et al. 2009

Journal of Fish Biology

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Mahseer is a group of fish species that are well known as food and game fishes. The taxonomy of the mahseer species is confusing owing to the morphological variations and habitat adaptation. Detailed karyomorphological investigations have been carried out in seven species of mahseer, using karyotyping, Ag-NOR and fluorescent staining techniques. The basic diploid chromosome number (2n), in all mahseer species, was observed to be 100; however, the karyotype formula varied among the species, which were recorded as: 20m + 14sm + 22st + 44t (fundamental arm number, FN = 134) in Tor khudree; 22m + 24sm + 24st + 30t (FN = 146) in Tor mussullah; 12m + 22sm + 14st + 52t (FN = 134) in Tor putitora; 20m + 24sm + 24st + 32t (FN = 144) in Tor tor; 20m + 30sm + 24st + 26t (FN = 150) in Tor chelynoides; 20m + 20sm + 20st + 40t (FN = 140) in Tor progeneius; and 20m + 18sm + 14st + 48t (FN = 138) in Neolissochilus hexagonolepis. Silver staining of the chromosomes revealed the presence of multiple nucleolar organizer regions (NOR) in these mahseer species. The highest number of NORs was observed in T. tor (four pairs of chromosomes), whereas the other six species possessed Ag-NOR signals on only two pairs of chromosomes. Although chromomycin A(3) (CMA(3)) staining induced bright fluorescence signals on same Ag-NORs sites, with CMA(3), one additional signal was observed on the p arm of subtelocentric chromosomes in T. tor, T. chelynoides, T. progeneius and N. hexagonolepis, which may indicate the presence of inactive NOR in these species. The information on cytogenetic profile of these mahseer species is discussed in the light of cytotaxonomic implications and understanding the karyoevolution of these fish species.

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Section: Discussionsupporting

confidence: 91%

Karyotypic diversity and evolution of seven mahseer species (Cyprinidae) from India

Mani

Kumar

Singh

et al. 2009

Journal of Fish Biology

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“…, 2007), Hypostomus ancistroides (Michele, Takahashi & Ferrari, 1977; Artoni & Bertollo, 1996; Alves et al. , 2006), and Oligosarcus hepsetus (Falcão & Bertollo, 1985; Centofante, Bertollo & Moreira‐filho, 2006). Such differences must be mainly related to chromosome rearrangements, such as pericentric inversions and/or translocations.…”

Section: Discussionmentioning

confidence: 99%

Chromosome characterization and biogeographic relations among three populations of the driftwood catfish Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes: Auchenipteridae) in Brazil

Lui

Blanco

Margarido

et al. 2010

Biological Journal of the Linnean Society

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The present study employed basic and molecular cytogenetic methods to characterize three populations of Parauchenipterus galeatus from the basins of the Paraná and São Francisco Rivers, and a region of connection between the two basins. Although the diploid number was equal to 58 chromosomes, variations in karyotype formula were detected among the populations. B chromosomes were detected only in the population from the São Francisco River. Heterochromatin was located in the terminal position in almost all the chromosomes and in the pericentromeric position in some acrocentric chromosomes in the three populations. A single nucleolus organizer region was detected by silver nitrate and 18S rDNA-fluorescent in situ hybridization in the short arm of one subtelocentric pair in the three populations, varying only in the chromosome pair bearing this site. The 5S rDNA sites were located in two submetacentric chromosome pairs in the three populations, varying only in the chromosome pairs bearing these sequences. Classic and molecular chromosome markers, along with the context of the natural history of the formation of hydrographic basins, ecological aspects, and the geographic isolation of populations between hydrographic basins and within the same basin, were important contributions to the discussion on possible biogeographic relations among the populations of Parauchenipterus galeatus.

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“…This hypothesis is corroborated by the interpopulational karyotypical differences observed in the present study. Centofante et al (2006) observed similar results (interpopulational differences in the karyotypic formula, in the number of chromosomes bearing NORs and in the pattern of the heterochromatin) in both populations of Oligosarcus hepsetus (Cuvier, 1829) belonging to tributaries of opposite margins of the Paraíba do Sul River, suggesting that this river limited the genetic flow between the populations, favoring the fixation of rearrangements.…”

Section: Discussionmentioning

confidence: 58%

Interpopulational comparative cytogenetics analysis among three Astyanax (Characiformes: Incertae Sedis) species of two streams of upper Paraná River basin, Brazil

2014

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Populations of Astyanax paranae, Astyanax fasciatus and Astyanax altiparanae collected from the Pindorama and Lopei streams (upper Paraná river basin, Brazil) were cytogenetically studied, checking for chromosomal differentiation and the evolutionary trend in the three species. Forty-eight chromosomes (8m + 20sm + 10st + 10a) were observed in both populations of Astyanax paranae. Astyanax fasciatus exhibited 50 chromosomes (8m + 18sm + 10st + 14a, Pindorama stream; 8m + 14sm + 12st + 16a, Lopei stream). The diploid number for A. altiparanae was 50 chromosomes in both populations (6m + 30sm + 4st + 10a). The three studied species exhibited multiple AgNORs with differences among the populations of A. paranae and A. fasciatus. Regarding the heterochromatin distribution, interpopulational differences were observed in the three species. The data of the present study demonstrate that both A. paranae and A. fasciatus exhibit karyotypical interpopulational differences more conspicuous than A. altiparanae populations, probably due to the characteristics that restricted both the A. paranae and the A. fasciatus to the upper portion of the streams, leading to the fixation of different chromosomal rearrangements in the populations. However, the absence of conspicuos interpopulational karyotypical differences in A. altiparanae suggests a gene flow between both populations. In the present study, the role of the streams as an environment which maintains the diversity of fish with different genetic pools became evident.

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Chromosomal differentiation between populations of Oligosarcus hepsetus (Teleostei, Characidae) from small tributaries at opposite margins of the Paraíba do Sul river (Brazil)

Abstract: ABSTRACT

Cited by 11 publications

References 17 publications

Karyotypic diversity and evolution of seven mahseer species (Cyprinidae) from India

Karyotypic diversity and evolution of seven mahseer species (Cyprinidae) from India

Chromosome characterization and biogeographic relations among three populations of the driftwood catfish Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes: Auchenipteridae) in Brazil

Interpopulational comparative cytogenetics analysis among three Astyanax (Characiformes: Incertae Sedis) species of two streams of upper Paraná River basin, Brazil

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