Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins
Autor(a) principal: | |
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Data de Publicação: | 1993 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1080/00087114.1993.10797246 http://hdl.handle.net/11449/223843 |
Resumo: | The karyotypes, location of nucleolus organizer regions (NOR) and constitutive heterochromatin pattern of Sternopygus macrurus (Pisces, Gymnotoidei) of natural populations from the Amazon River, Sao Francisco River and Tiete River (the last belonging to the Upper Paraná River system) are reported. All specimens had 2n = 46 chromosomes and presented small differences in karyotypic formulae, but populations of each river basin had a different fixed NOR phenotype. The loss of the satellite and a gradual deletion of the heterochromatin block adjacent to the NOR may be the origin of the variants. The possible mechanism of fixation of the NOR phenotypes, and the implications of the occurrence of intraspecific differences in fixed NOR phenotype in this species are discussed. © 1993 Taylor & Francis Group, LLC. |
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Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basinsC-bandFish cytogeneticsGymnotoideiNORSternopygusThe karyotypes, location of nucleolus organizer regions (NOR) and constitutive heterochromatin pattern of Sternopygus macrurus (Pisces, Gymnotoidei) of natural populations from the Amazon River, Sao Francisco River and Tiete River (the last belonging to the Upper Paraná River system) are reported. All specimens had 2n = 46 chromosomes and presented small differences in karyotypic formulae, but populations of each river basin had a different fixed NOR phenotype. The loss of the satellite and a gradual deletion of the heterochromatin block adjacent to the NOR may be the origin of the variants. The possible mechanism of fixation of the NOR phenotypes, and the implications of the occurrence of intraspecific differences in fixed NOR phenotype in this species are discussed. © 1993 Taylor & Francis Group, LLC.Departamento de Biologia Instituto de Biociências USP, Caixa Postal 11461, São Paulo, SP, 05422-970Departamento de Morfologia Instituto de Biociências UNESP, Campus de Botucatu, Botucatu, SPDepartamento de Morfologia Instituto de Biociências UNESP, Campus de Botucatu, Botucatu, SPUniversidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)De Almeida-Toledo, L. ForestiForesti, F. [UNESP]Zambelli Daniel, M. F.De Almeida Toledo-Filho, S.2022-04-28T19:53:21Z2022-04-28T19:53:21Z1993-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article53-61http://dx.doi.org/10.1080/00087114.1993.10797246Caryologia, v. 46, n. 1, p. 53-61, 1993.2165-53910008-7114http://hdl.handle.net/11449/22384310.1080/00087114.1993.107972462-s2.0-0001804558Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCaryologiainfo:eu-repo/semantics/openAccess2022-04-28T19:53:21Zoai:repositorio.unesp.br:11449/223843Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:52:42.355411Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
title |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
spellingShingle |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins De Almeida-Toledo, L. Foresti C-band Fish cytogenetics Gymnotoidei NOR Sternopygus |
title_short |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
title_full |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
title_fullStr |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
title_full_unstemmed |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
title_sort |
Nucleolar chromosome variants in Sternopygus macrurus (Pisces, Sternopygidae) from three Brazilian river basins |
author |
De Almeida-Toledo, L. Foresti |
author_facet |
De Almeida-Toledo, L. Foresti Foresti, F. [UNESP] Zambelli Daniel, M. F. De Almeida Toledo-Filho, S. |
author_role |
author |
author2 |
Foresti, F. [UNESP] Zambelli Daniel, M. F. De Almeida Toledo-Filho, S. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
De Almeida-Toledo, L. Foresti Foresti, F. [UNESP] Zambelli Daniel, M. F. De Almeida Toledo-Filho, S. |
dc.subject.por.fl_str_mv |
C-band Fish cytogenetics Gymnotoidei NOR Sternopygus |
topic |
C-band Fish cytogenetics Gymnotoidei NOR Sternopygus |
description |
The karyotypes, location of nucleolus organizer regions (NOR) and constitutive heterochromatin pattern of Sternopygus macrurus (Pisces, Gymnotoidei) of natural populations from the Amazon River, Sao Francisco River and Tiete River (the last belonging to the Upper Paraná River system) are reported. All specimens had 2n = 46 chromosomes and presented small differences in karyotypic formulae, but populations of each river basin had a different fixed NOR phenotype. The loss of the satellite and a gradual deletion of the heterochromatin block adjacent to the NOR may be the origin of the variants. The possible mechanism of fixation of the NOR phenotypes, and the implications of the occurrence of intraspecific differences in fixed NOR phenotype in this species are discussed. © 1993 Taylor & Francis Group, LLC. |
publishDate |
1993 |
dc.date.none.fl_str_mv |
1993-01-01 2022-04-28T19:53:21Z 2022-04-28T19:53:21Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1080/00087114.1993.10797246 Caryologia, v. 46, n. 1, p. 53-61, 1993. 2165-5391 0008-7114 http://hdl.handle.net/11449/223843 10.1080/00087114.1993.10797246 2-s2.0-0001804558 |
url |
http://dx.doi.org/10.1080/00087114.1993.10797246 http://hdl.handle.net/11449/223843 |
identifier_str_mv |
Caryologia, v. 46, n. 1, p. 53-61, 1993. 2165-5391 0008-7114 10.1080/00087114.1993.10797246 2-s2.0-0001804558 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Caryologia |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
53-61 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128428951470080 |