Cytogenetic Analysis of Four Curimatids from the Paraguay Basin, Brazil (Pisces: Characiformes: Curimatidae).

Navarrete, M. C.; Júlio, Horácio Ferreira

doi:10.1508/cytologia.62.241

Cited by 14 publications

(12 citation statements)

References 20 publications

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“…The presence of 2n=54 biarmed chromosomes have also been consistently found in the families Anostomidae (Galetti Jr et al, 1991a, 1991bGaletti Jr et al, 1995), Curimatidae (Vênere & Galetti, 1989;Feldberg et al, 1992;Navarrete & Júlio, 1997), and Chilodontidae (Cestari et al, 1990;Vênere, 1998), corroborating the hypothesis that these four families constitute a natural group in the order Characiformes (Vari, 1983).…”

Section: Fig 1 Karyotypes Of: A) Prochilodus Mariae With 2n=54 Chrosupporting

confidence: 53%

“…The same was reported to occur in other Prochilodus species (Pauls & Bertollo, 1990), showing that this characteristic is very much conserved in the genus. The remarkable conservatism of the Ag-NOR-bearing chromosome pair in Prochilodus species is noteworthy considering that even the species of Curimatidae (Vênere & Galetti, 1989;Feldberg et al, 1992;Navarrete & Júlio, 1997) and Anostomidae (Galetti Jr et al, 1991a, 1991bGaletti Jr et al, 1995) that have very conservative karyotypes, usually display speciesspecific Ag-NOR-bearing chromosomes. The karyotype of P. mariae showed a large amount of heterochromatin, basically in the centromeric and pericentromeric regions of almost all chromosomes (Fig.…”

Section: Fig 1 Karyotypes Of: A) Prochilodus Mariae With 2n=54 Chromentioning

confidence: 99%

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Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela

et al. 2003

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Fish of the family Prochilodontidae are considered one of the most important components of commercial and subsistence fishery in freshwater environments in South America. This family consists of 21 species and three genera. In the present study, the karyotypes of Prochilodus mariae, Semaprochilodus kneri, and S. laticeps from Caicara del Orinoco, Bolivar State, Venezuela were studied. The species P. mariae, S. kneri and S. laticeps exhibited 2n=54 chromosomes (40 metacentric and 14 submetacentric), a single chromosome pair with nucleolus organizer regions, and a large amount of heterochromatin found at centromeric and pericentromeric positions in almost all chromosomes. The P. mariae specimens studied displayed 0 to 3 supernumerary microchromosomes. The data obtained here confirm the conservative nature of the chromosome number and morphology of Prochilodontidae and reinforce the hypothesis that small structural chromosome rearrangements were the main cause of the karyotypic diversification seen in this group.Os peixes da família Prochilodontidae são considerados um dos componentes mais importantes da pesca comercial e de subsistência em ambientes de água doce na América do Sul. Essa família compreende 21 espécies e três gêneros. No presente estudo foram analisados os cariótipos de Prochilodus mariae, Semaprochilodus kneri e S. laticeps provenientes de Caicara del Orinoco, Estado Bolivar, Venezuela. As espécies P. mariae, S. kneri e S. laticeps apresentaram 2n=54 cromossomos (40 metacêntricos e 14 submetacêntricos), um único par de cromossomos com regiões organizadoras de nucléolo e uma grande quantidade de heterocromatina em posição centromérica e pericentromérica de quase todos os cromossomos. Os espécimes estudados de P. mariae apresentaram de 0 a 3 microcromossomos supranumerários. Os dados obtidos aqui confirmam a natureza conservada do número e da morfologia cromossômica dos Prochilodontidae e reforçam a hipótese de que pequenos rearranjos estruturais foram os principais eventos fixados na diversificação cariotípica do grupo.

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Section: Fig 1 Karyotypes Of: A) Prochilodus Mariae With 2n=54 Chrosupporting

confidence: 53%

Section: Fig 1 Karyotypes Of: A) Prochilodus Mariae With 2n=54 Chromentioning

confidence: 99%

Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela

et al. 2003

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“…This finding confirms the karyotypic stability in the family Curimatidae, since this diploid number has been found in the majority of species so far studied (Navarrete and Júlio, 1997;Brassesco et al, 2004;among others).…”

Section: Resultssupporting

confidence: 80%

Occurrence of B chromosomes in Cyphocharax modestus (Fernández-Yépez, 1948) and Steindachnerina insculpta (Fernández-Yépez, 1948)(Characiformes, Curimatidae) from the Tibagi River basin (Paraná State, Brazil)

et al. 2007

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We cytogenetically analyzed 18 individuals of Cyphocharax modestus, and 41 individuals of Steindachnerina insculpta from the Tibagi River basin (Paraná State, Brazil). All the specimens had 2n = 54 chromosomes, all meta-submetacentric (M-SM). The presence of 1 or 2 B chromosomes was seen in some individuals of C. modestus of the two sampled populations, showing inter-and intra individual variation. In S. insculpta, B chromosomes were also observed but only in one population, also showing inter-and intra individual variation. C-banding was used to show that the identified B chromosomes were totally heterochromatic in the two examined species.Keywords: supernumerary chromosomes, karyotype, C-banding, fish populations. Ocorrência de cromossomos B em Cyphocharax modestus e Steindachnerina insculpta(Characiformes, Curimatidae) da bacia do Rio Tibagi (Paraná, Brasil) ResumoForam analisados, citogeneticamente, 18 indivíduos de Cyphocharax modestus e 41 indivíduos de Steindachnerina insculpta da bacia do rio Tibagi (Paraná, Brasil). Todos os espécimes apresentaram 2n = 54 cromossomos, todos do tipo meta-submetacêntrico (M-SM). A presença de 1 ou 2 cromossomos B foi detectada em alguns indivíduos de C. modestus de duas populações amostradas, evidenciando uma variação inter e intraindividual. Em S. insculpta, também foram observados cromossomos B, embora em somente uma população, mostrando também uma variação inter e intraindividual. Bandamento C foi usado para mostrar que os cromossomos B identificados apresentaram-se totalmente heterocromáticos nas duas espécies examinadas.Palavras-chave: cromossomos supranumerários, cariótipo, bandamento C, populações de peixes.

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“… * References: 1, present work; 2, Brassesco et al (2004); 3, Carvalho et al (2001); 4, Feldberg et al (1992); 5, Feldberg et al (1993); 6, Martins et al (1996); 7, Navarrete & Júlio‐Júnior (1997); 8, Oliveira & Foresti (1993); 9, Venere & Galetti (1989); 10, Venere & Galetti (1995); 11, Venere et al (1999). …”

Section: Introductionmentioning

confidence: 84%

Recent chromosome diversification in the evolutionary radiation of the freshwater fish family Curimatidae (Characiformes)

Vênere

Souza

Silva

et al. 2008

Journal of Fish Biology

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Neotropical Curimatidae fishes include 97 species in eight genera. Basic cytogenetic studies show a karyotype of 2n ¼ 54 chromosomes in most species. Karyotype divergence of the nucleolus organizing regions between species has been reported, and these regions appear to be good cytotaxonomic markers. In the present work, karyotype, heterochromatin and Ag-NOR variability in 13 species were investigated to analyse the chromosome diversification in view of the biogeographic history of this group. Only Cyphocharax platanus showed a karyotype with 2n ¼ 58 chromosomes. Ag-NOR and C-banding patterns were quite divergent among the species studied. All species whose C-bands were analysed had heterochromatic blocks associated with the nucleolus organizing regions. Species with multiple Ag-NORs also showed an increase in NOR-associated heterochromatic blocks. C-banding showed considerable differentiation among species, revealing a pronounced chromosome diversification in this group. Karyotypic variability corroborates the hypothesis that these fishes in Amazon region show various discrete patterns of species endemism. Chromosome diversification in curimatids has a recent origin and appears to be accompanying the post-Andean speciation responsible for the diversity of species in the family.

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Cytogenetic Analysis of Four Curimatids from the Paraguay Basin, Brazil (Pisces: Characiformes: Curimatidae).

Cited by 14 publications

References 20 publications

Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela

Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela

Occurrence of B chromosomes in Cyphocharax modestus (Fernández-Yépez, 1948) and Steindachnerina insculpta (Fernández-Yépez, 1948)(Characiformes, Curimatidae) from the Tibagi River basin (Paraná State, Brazil)

Recent chromosome diversification in the evolutionary radiation of the freshwater fish family Curimatidae (Characiformes)

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