Cytogenetic Studies and Evolutive Considerations on Fishes of the Family Cichlidae (Perciformes) from Parana River (Argentina)

Roncati, Héctor Alberto; Pastori, María Cristina; Fenocchio, Alberto Sérgio

doi:10.1508/cytologia.72.379

Cited by 19 publications

(19 citation statements)

References 16 publications

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“…In the Cichlidae family, karyotypic analysis have demonstrated the maintenance of the diploid number in most species. As observed to the most of Neotropical cichlids, the diploid number of 48 chromosomes was constant in both G. basiliensis here analyzed, corroborating with the ancestral condition for both Cichlidae and Perciformes (THOMPSON 1979;FELDBERG;BERTOLLO, 1985;MARTINS et al, 1995;VICARI et al, 2006;RONCATI et al, 2007;PERAZZO et al, 2010). However, this diploid number can vary between 32 and 60 chromosomes (FELDBERG et al, 2003) in some cichlids species.…”

Section: Discussionsupporting

confidence: 87%

Comparative Cytogenetic Study Among Three Fish Species: An Analysis From a Water Divide Region

Moreira-Filho¹,

Neto²,

Oliveira³

et al. 2011

Publ. Biologicas

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The aim of the present study was to characterize chromosomal differences between two populations separated in the past for a water divide. Processes of differentiation have been identifi ed in the species studied, being justifi ed by the separation of streams from past for a water divide. Karyotypic data were presented for Astyanax altiparanae, Geophagus brasiliensis and Gymnotus carapo populations of two different river systems of the upper Parana: ribeirão do Pântano (Tietê basin) and ribeirão do Feijão (Mogi Guaçu basin) in the São Carlos region, state of São Paulo. The Astyanax altiparanae, presented a diploid number of 2n=50 chromosomes. The Geophagus brasiliensis diploid numbers was 2n=48 chromosomes and Gymnotus carapo a diploid number of 2n=54 chromosomes. An analysis was made of constitutive heterochromatin by C-banding, detection of nucleolar organizer regions and the technique of Hybridization in situ Fluorescent with probes 18S rDNA and 5S rDNA. These results indicate that the species analysed showed differences of karyotype, showing that each population follows its own evolution, as a result of a restrictive process of gene fl ow.

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Section: Discussionsupporting

confidence: 87%

Comparative Cytogenetic Study Among Three Fish Species: An Analysis From a Water Divide Region

Moreira-Filho¹,

Neto²,

Oliveira³

et al. 2011

Publ. Biologicas

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“…In G. gymnogenys, by contrast, the NORs are found in an interstitial position on the long arm of the subtelo-acrocentric chromosome pair 3 and a terminal position on the short arm of the subtelo-acrocentric pair 9 (Pires et al, 2010). By contrast, simple NORs were observed in an interstitial position on the short arm of the metasubmetacentric chromosome pair in G. balzanii (Roncati et al, 2007), G. labiatus (Pires et al, 2010) and B. cupido , and in a terminal position on the short arm of the subtelo-acrocentric chromosome in Geophagus brasiliensis (Vicari et al, 2006) and Satanoperca jurupari (Poletto et al, 2010a). The presence of simple NORs in the first chromosome pair (meta-submetacentric) is probably a plesiomorphic condition in Neotropical cichlids (Feldberg, Bertollo, 1985b).…”

Section: Discussionmentioning

confidence: 81%

“…The diploid number of 48 chromosomes found in Gymnogeophagus setequedas is the same as the number observed in congeneric species. However, the karyotype formula for G. setequedas (4sm + 24st + 20a) differs from those of its congeners, such as G. balzanii (2m-sm + 46st-a, Roncati et al, 2007), G. gymnogenys (4m + 44st-a; 6m + 42st-a), and G. labiatus (4m + 4sm + 40st-a) (Pires et al, 2010). These differences may reflect structural rearrangements, such as inversions and/or translocations, or may be due to the condensation or reorganization of the chromosomes, as proposed by the respective authors.…”

Section: Discussionmentioning

confidence: 99%

“…This is a common pattern in Neotropical cichlids (Feldberg et al, 2003;Valente et al, 2012). However, while this is a conserved pattern, some variation has been observed, indicating the occurrence of rearrangements during the chromosomal evolution of some groups (Feldberg et al, 2003;Roncati et al, 2007;Perazzo et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Previous cytogenetic data are available for species of the genera Geophagus Heckel, 1840 (Vicari et al, 2006;Pires et al, 2010;Nakajima et al, 2012;Schneider et al, 2013;Perazzo et al, 2013), Gymnogeophagus Miranda Ribeiro, 1918 (Pires et al, 2010), Apistogramma Regan, 1913, Biotodoma Eigenmann & Kennedy, 1903and Satanoperca Günther, 1862(Poletto et al, 2010a. In the case of Gymnogeophagus, cytogenetic studies have focused on just three species, G. balzanii (Feldberg, Bertollo, 1984, 1985aRoncati et al, 2007), G. gymnogenys and G. labiatus (Pires et al, 2010). These species have a diploid number of 48 chromosomes, a centromeric/pericentromeric distribution of heterochromatin, and simple nucleolar organizer regions (NORs), located predominantly on the first chromosome pair.…”

Section: Introductionmentioning

confidence: 99%

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Cytogenetics of Gymnogeophagus setequedas (Cichlidae: Geophaginae), with comments on its geographical distribution

et al. 2017

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We provide cytogenetic data for the threatened species Gymnogeophagus setequedas, and the first record of that species collected in the Iguaçu River, within the Iguaçu National Park's area of environmental preservation, which is an unexpected occurrence for that species. We verified a diploid number of 2n = 48 chromosomes (4sm + 24st + 20a) and the presence of heterochromatin in centromeric and pericentromeric regions, which are conserved characters in the Geophagini. The multiple nucleolar organizer regions observed in G. setequedas are considered to be apomorphic characters in the Geophagini, whereas the simple 5S rDNA cistrons located interstitially on the long arm of subtelocentric chromosomes represent a plesiomorphic character. Because G. setequedas is a threatened species that occurs in lotic waters, we recommend the maintenance of undammed environments within its known area of distribution.Keywords: Chromosomes, Conservation, Iguaçu River, Karyotype, Paraná River.Fornecemos dados citogenéticos para a espécie ameaçada Gymnogeophagus setequedas, e o primeiro registro da espécie coletado no rio Iguaçu, na área de preservação ambiental do Parque Nacional do Iguaçu, a qual é uma área de ocorrência inesperada para esta espécie. Verificamos em G. setequedas 2n = 48 cromossomos (4sm + 24st + 20a) e heterocromatina presente nas regiões centroméricas e pericentroméricas, as quais indicam caracteres conservados em Geophagini. Múltiplas regiões organizadoras de nucléolos foram observadas em G. setequedas e são consideradas características apomórficas em Geophagini, enquanto cístrons de DNAr 5S simples e localizados intersticialmente no braço longo de cromossomos subtelocêntricos representam uma característica plesiomórfica. Visto que G. setequedas é uma espécie ameaçada de extinção que ocorre em águas lóticas, recomendamos a manutenção de ambientes livre de barragens em sua área de distribuição.

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Chromosomal studies in Crenicichla lepidota and Australoheros facetus (Cichlidae, Perciformes) from extreme Southern Brazil

Perazzo

Noleto

Vicari

et al. 2010

Rev Fish Biol Fisheries

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Fishes of the family Cichlidae generally show low karyotype variability. Nevertheless, karyotype variants have been identified within some genera, providing information about their evolutionary history. In the present study, karyotype characteristics of Crenicichla lepidota and Australoheros facetus, two sympatric species found in the São Gonçalo-Mangueira basin, were studied. Besides conventional procedures, double fluorochromes staining chromomycin A 3 /DAPI and fluorescent in situ hybridization (FISH) with rDNA probes were also used. Both species presented 2n = 48 chromosomes, but karyotypes were differentiated by fundamental number, which was equal to 70 in A. facetus and 56 in C. lepidota. Similar heterochromatin distribution patterns were also observed on the pericentromeric region of most chromosomes, although C. lepidota presented an additional heterochromatic block in the first pair. The Ag-NORs, 18S rDNA probe and CMA 3 /DAPI were coincident in location on the first and second pairs of C. lepidota and A. facetus, respectively. The minor rDNA loci (5S rDNA) were found in four sites located on two distinct chromosomal pairs in C. lepidota. Although the data obtained here to C. lepidota and to A. facetus show chromosomal characteristics considered ancestral to the family, new data are presented to both species. Additionally, this study corroborates the hypothesis in which evolutionary processes like non-Robertsonian rearrangements are involved in the diversification of the major groups of Neotropical Cichlidae. Thus, the karyotype diversification observed in A. facetus have the high fundamental number pathway while C. lepidota has others evolutionary chromosomal mechanisms.

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Cytogenetic Studies and Evolutive Considerations on Fishes of the Family Cichlidae (Perciformes) from Parana River (Argentina)

Cited by 19 publications

References 16 publications

Comparative Cytogenetic Study Among Three Fish Species: An Analysis From a Water Divide Region

Comparative Cytogenetic Study Among Three Fish Species: An Analysis From a Water Divide Region

Cytogenetics of Gymnogeophagus setequedas (Cichlidae: Geophaginae), with comments on its geographical distribution

Chromosomal studies in Crenicichla lepidota and Australoheros facetus (Cichlidae, Perciformes) from extreme Southern Brazil

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