Karyological Evidence for a Cryptic Species of Piranha within<i>Serrasalmus rhombeus</i>(Characidae, Serrasalminae) in the Amazon

Nakayama, Celeste Mutuko; Jégu, Michel; Porto, Jorge Ivan Rebelo; Feldberg, Eliana

doi:10.1643/0045-8511(2001)001[0866:kefacs]2.0.co;2

Cited by 30 publications

(47 citation statements)

References 4 publications

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“…In species of Serrasalmus, the Ag-NORs were always located on the short arms of the acro-subtelocentric chromosomes (Galetti et al, 1985;Cestari and Galetti, 1992a, b;Martins-Santos et al, 1994;Nakayama et al, 2001Nakayama et al, , 2002Centofante et al, 2002), coinciding with the pattern observed in the three species analyzed herein. Nonetheless, the maximum number of Ag-NORs differed among species (nine in S. altispinnis, eight in S. gouldingi and 12 in S. serrulatus).…”

Section: Discussionsupporting

confidence: 82%

“…For instance, four distinct karyotypes were found in S. maculata (junior synonyme -S. spilopleura Jégu and Santos, 2001) in the confluence of the Negro and Solimões Rivers, Amazon Basin (Nakayama et al, 2000;Centofante et al, 2002), while three karyomorphs were reported in the Paraná Basin population (Cestari and Galetti, 1992b). While S. rhombeus presented a karyotype with 2n = 60; a criptic species presented 2n = 58 and a karyotype probably derived from the 2n = 60 by chromosome fusions (Nakayama et al, 2001), and a third new karyomorph was also reported (Teixeira et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Mapping of ribosomal genes and chromosomal markers in three species of the genus Serrasalmus (Characidae, Serrasalminae) from the Amazon basin

2008

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Karyotypic characteristics of three species of the genus serrasalmus (S. altispinnis, S. gouldingi and S. Serrulatus) from the middle and lower Negro River, Amazon Basin, were investigated using different staining techniques and Fluorescent in situ hybridization with 5S and 18S rDNA probes. The diploid number was invariably 2n = 60 and the fundamental number was FN = 110. Nevertheless, the karyotypes differed from each other in composition: 24m, 20sm, 6st, 10a in S. altispinnis; 22m, 22sm, 6st, 10a in S. gouldingi and 20m, 22sm, 8st, 10a in S. serrulatus. The karyotype of S. altispinnis differed from the one previously described in a population from the Pitinga River. C-positive constitutive heterochromatin was mainly pericentromeric in the karyotypes of all species. Nucleolar organizer regions were multiple and preferentially located terminally on the short arms of the subtelocentric/acrocentric chromosomes, as evidenced by both silver nitrate staining and fluorescent in situ hybridization with the 18S rDNA probe. The maximum number of NORs varied among species, as did the NOR-bearing chromosomes. FISH with the 5S rDNA probe produced an interstitial signal on the long arms of the pair 7 in all species, coincident with a C-positive heterochromatic band. While some chromosome features were shared by the three species, some were species-specific and thus useful for cytotaxonomy.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Mapping of ribosomal genes and chromosomal markers in three species of the genus Serrasalmus (Characidae, Serrasalminae) from the Amazon basin

2008

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“…rhombeus) bearing 2n = 58 chromosomes (Nakayama et al, 2001), as well as another karyomorph was identified by chromosomal and molecular analyses (Teixeira et al, 2006), suggesting that S. rhombeus is a complex of species. This hypothesis is strengthened by the present data on 18S rDNA sites, since S. cf.…”

Section: Discussionmentioning

confidence: 97%

“…Ag-NORs in Serrasalmidae have been analyzed since the 1980s and have invariably been visualized as multiple sites usually located in the terminal region on the short arms of subtelo-acrocentric chromosomes, although some species bear terminal Ag-NORs on the long arms (Galetti Jr. et al, 1985;Almeida-Toledo et al, 1987;Cestari & Galetti Jr. 1992a, b;Martins-Santos et al, 1994;Nakayama et al, 2001Nakayama et al, , 20022008;Centofante et al, 2002a;Nirchio et al, 2003;Gaviria et al, 2005). However, the numerical variation in these regions (in both inter and intra-specific terms) is much more notable than the positional differences, ranging from four sites in C. macropomum to 12 sites in S. rhombeus (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Karyotype differentiation and cytotaxonomic considerations in species of Serrasalmidae (Characiformes) from the Amazon basin

Nakayama¹,

Feldberg

Bertollo³

2012

Neotrop. ichthyol.

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Six species of Serrasalmidae from the central Amazon, representatives of the genera Serrasalmus (S. elongatus, S. maculatus, S. cf. rhombeus, and S. rhombeus), Pygocentrus (P. nattereri), and Colossoma (C. macropomum), were analyzed regarding the distribution of the Ag-NORs, C-positive heterochromatin and 18S and 5S rRNA genes on the chromosomes. All specimens had 2n = 60 chromosomes, except S. cf. rhombeus, with 2n = 58, and C. macropomum with 2n = 54 chromosomes. The Ag-NORs were multiple and located on the short arms of subtelo-acrocentric chromosomes in all Serrasalmus species and in P. nattereri, but were found on metacentric chromosomes in C. macropomum. The 18S rDNA sites were usually coincident with Ag-NORs, although some species had a higher number and/or a distinct localization of these sites. C-positive heterochromatin was preferentially situated in centromeric regions, remarkably on metacentric pair number 7 in all Serrasalmus species and number 3 in P. nattereri, which beared a conspicuous proximal C-band on the long arms. The 5S rDNA sites were detected in a single chromosomal pair in all species. In Serrasalmus and P. nattereri, this pair was the number 7 and 3, respectively, thereby revealing its co-localization with the conspicuous heterochromatic band. However, in C. macropomum, only one homologue (probably belonging to pair number 12) exhibited 5S rDNA sites on the short arms, close to the centromere. The present data revealed reliable cytotaxonomic markers, enabling the evaluation of karyotype differentiation and interrelationships among Serrasalmidae, as well as the probable occurrence of a species complex in S. rhombeus. Seis espécies de Serrasalmidae da Amazônia central, representantes dos gêneros Serrasalmus (S. elongatus, S. maculatus, S. cf. rhombeus e S. rhombeus ), Pygocentrus (P. nattereri)e Colossoma (C. macropomum), foram analisadas quanto à distribuição das Ag-RONs, heterocromatina C-positiva e dos genes de RNAr 18S e 5S nos cromossomos. Todos os espécimes apresentaram 2n = 60 cromossomos, exceto S. cf. rhombeus, com 2n = 58, e C. macropomum com 2n = 54 cromossomos. As Ag-RONs foram múltiplas e localizadas nos braços curtos de cromossomos subtelo-acrocêntricos em todas as espécies de Serrasalmus e em P. nattereri, mas foram encontrados em cromossomos metacêntricos em C. macropomum. Os sítios de DNAr 18S, foram geralmente coincidentes com as Ag-RONs, embora algumas espécies tenham apresentado um maior número e/ou uma localização distinta desses sítios. A heterocromatina C-positiva foi preferencialmente encontrada como uma conspícua banda proximal no par metacêntrico número 7 em todas as espécies de Serrasalmus e número 3 em P. nattereri. Os sítios de DNAr 5S foram detectados em um único par cromossômico nas seis espécies sendo que nas espécies de Serrasalmus, este par foi o de número 7 e em P. nattereri o de número 3, colocalizados com bandas heterocromáticas conspícuas. No entanto, em C. macropomum, apenas um homólogo (provavelmente pertencente ao par número 12) apresentou sítios ...

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“…A presença deste número cromossômico em todas as espécies já analisadas citogeneticamente refl ete um conservadorismo para a subfamília, tal como ocorre em outros grupos da família Characidae, como Bryconinae (BIGONI et al 1993;MARGARIDO & GALETTI Jr., 1996; WASKO; GALETTI Jr., 2000; MARIGUELA et al, 2010), Stethaprioninae (PFISTER et al 1997;FREITAS et al 1998;CARVALHO et al, 2002), e em Oligosarcus (incertae sedis) (FALCÃO; BERTOLLO, 1985;OLIVEIRA et al, 1988;RUBERT;MARGARIDO, 2007), onde o número diplóide de 2n=50 cromossomos é predominante. Por outro lado, na família Characidae têm sido observados freqüentemente exemplos de grupos com grande variação cariotípica, tal como Astyanax onde o número diplóide modal varia de 2n=36 a 2n=50 cromossomos (MORELLI et al, 1983;BERTOLLO, 1991;SOUZA;MOREIRA-FILHO, 1995;MAISTRO et al, 2000;CARVALHO et al, 2002) e Serrassalminae com variação de 2n=54 a 64 cromossomos (MURAMOTO et al, 1968;CESTARI;GALETTI Jr., 1992;NAKAYAMA et al, 2001e NIRCHIO et al, 2002.…”

Section: Discussionunclassified

Caracterização Do Número Cromossômico Em Espécies De Odontostilbe E Serrapinnus (Characidae: Cheirodontinae) Da Bacia Do Rio Paraguai, Brasil

Troy¹,

Pacheco²,

Oliveira³

et al. 2011

Publ. Biologicas

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Recebido para publicação em 12/05/2010 Aceito para publicação em 21/06/2010 RESUMOCheirodontinae constitui um grupo de 17 gêneros e 55 espécies ainda pouco estudadas citogeneticamente, sendo que a maioria dos dados disponíveis na literatura é da bacia do Alto Paraná. No presente estudo são caracterizadas cromossomicamente as espécies Odontostilbe pequira, Serrapinnus kriegi, Serrapinnus calliurus e Serrapinnus microdon da bacia do Alto Paraguai. O número diplóide modal 2n=52 encontrado para estas espécies, bem como a maioria dos dados citados na literatura, evidencia um conservadorismo do número cromossômico para o grupo.Palavras-chave: Citotaxonomia, macroestrutura cariotípica, Pantanal. ABSTRACTCheirodontinae constitutes a group of 17 genera and 55 species still poorly studied cytogenetically, being that most data available in the literature is for the Alto Paraná basin. In this study Odontostilbe pequira, Serrapinnus kriegi, Serrapinnus calliurus and Serrapinnus microdon from Alto Paraguay basin was characterized cytogenetically. The modal diploid number 2n=52 found for these species, as well as most of the data cited in the literature, is an evidence of a conservadorism in chromosome number for the group.

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Karyological Evidence for a Cryptic Species of Piranha withinSerrasalmus rhombeus(Characidae, Serrasalminae) in the Amazon

Cited by 30 publications

References 4 publications

Mapping of ribosomal genes and chromosomal markers in three species of the genus Serrasalmus (Characidae, Serrasalminae) from the Amazon basin

Mapping of ribosomal genes and chromosomal markers in three species of the genus Serrasalmus (Characidae, Serrasalminae) from the Amazon basin

Karyotype differentiation and cytotaxonomic considerations in species of Serrasalmidae (Characiformes) from the Amazon basin

Caracterização Do Número Cromossômico Em Espécies De Odontostilbe E Serrapinnus (Characidae: Cheirodontinae) Da Bacia Do Rio Paraguai, Brasil

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