Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability
Autor(a) principal: | |
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Data de Publicação: | 1983 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1080/00087114.1983.10797664 http://hdl.handle.net/11449/224788 |
Resumo: | A study was carried out on mitotic and meiotic chromosomes of four species of the genus Astyanax (Pisces, Characidae) from three different water basins in the State of São Paulo, Brazil. The following karyotypic characteristics were observed: A. bimaculatus, 2n = 50 (n = 25, FN = 86-88); A. fasciatus, 2n = 46 (n = 23, FN = 90); « A. fasciatus » from the Juquiá river, 2n = 48 (n = 24, FN = 94); A. schubarti, 2n = 36 (n = 18, FN = 70) and A. scabripinnis paranae, 2n = 50 (n = 25, FN = 90-92). The diversity in the number and morphology of the chromosomes suggests a model of non-conservative karyotypic evolution in this genus, with chromosome rearrangements of the centric fusion/fission type and/or inversion playing an important role in these alterations. On the basis of its characteristics, A. schubarti has the most differentiated karyotype and, in view of the low diploid number and small number of subtelocentric-acrocentric chromosomes, is probably of most recent origin. The two karyotypes encountered in A. fasciatus raise the possibility that « A. fasciatus » from the Juquia river may represent a new subspecies, or even a new species, of fasciatus. The absence of karyotype differences between males and females, means that all four species lack differentiated sex chromosomes. © 1983 Taylor & Francis Group, LLC. |
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Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variabilityA study was carried out on mitotic and meiotic chromosomes of four species of the genus Astyanax (Pisces, Characidae) from three different water basins in the State of São Paulo, Brazil. The following karyotypic characteristics were observed: A. bimaculatus, 2n = 50 (n = 25, FN = 86-88); A. fasciatus, 2n = 46 (n = 23, FN = 90); « A. fasciatus » from the Juquiá river, 2n = 48 (n = 24, FN = 94); A. schubarti, 2n = 36 (n = 18, FN = 70) and A. scabripinnis paranae, 2n = 50 (n = 25, FN = 90-92). The diversity in the number and morphology of the chromosomes suggests a model of non-conservative karyotypic evolution in this genus, with chromosome rearrangements of the centric fusion/fission type and/or inversion playing an important role in these alterations. On the basis of its characteristics, A. schubarti has the most differentiated karyotype and, in view of the low diploid number and small number of subtelocentric-acrocentric chromosomes, is probably of most recent origin. The two karyotypes encountered in A. fasciatus raise the possibility that « A. fasciatus » from the Juquia river may represent a new subspecies, or even a new species, of fasciatus. The absence of karyotype differences between males and females, means that all four species lack differentiated sex chromosomes. © 1983 Taylor & Francis Group, LLC.Departamento de Ciências Biológicas Universidade Federal de Uberlândia, Campus Umuarama, Uberlândia, MG, 38.400Departamento de Ciências Biológicas Universidade Federal de São Carlos, São Carlos, SP, 13.560Departamento de Morfología Universidade Estadual Paulista « Julio de Mesquita Filho », Campus de Botucatu, Botucatu, SP, 18.610Departamento de Biologia Instituto de Biociências da Universidade de São Paulo, Sao Paulo, SP, 05.421Departamento de Morfología Universidade Estadual Paulista « Julio de Mesquita Filho », Campus de Botucatu, Botucatu, SP, 18.610Universidade Federal de Uberlândia (UFU)Universidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (UNESP)Universidade de São Paulo (USP)Morelli, S.Bertollo, L. A.C.Foresti, F. [UNESP]Moreira F°, O.De Almeida Toledo F°, S.2022-04-28T20:08:18Z2022-04-28T20:08:18Z1983-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article235-244http://dx.doi.org/10.1080/00087114.1983.10797664Caryologia, v. 36, n. 3, p. 235-244, 1983.2165-53910008-7114http://hdl.handle.net/11449/22478810.1080/00087114.1983.107976642-s2.0-33747335205Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCaryologiainfo:eu-repo/semantics/openAccess2022-04-28T20:08:18Zoai:repositorio.unesp.br:11449/224788Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:32:46.180183Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
title |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
spellingShingle |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability Morelli, S. |
title_short |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
title_full |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
title_fullStr |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
title_full_unstemmed |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
title_sort |
Cytogenetic considerations on the genus Astyanax (Pisces, characidae). I. Karyotypic variability |
author |
Morelli, S. |
author_facet |
Morelli, S. Bertollo, L. A.C. Foresti, F. [UNESP] Moreira F°, O. De Almeida Toledo F°, S. |
author_role |
author |
author2 |
Bertollo, L. A.C. Foresti, F. [UNESP] Moreira F°, O. De Almeida Toledo F°, S. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Uberlândia (UFU) Universidade Federal de São Carlos (UFSCar) Universidade Estadual Paulista (UNESP) Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Morelli, S. Bertollo, L. A.C. Foresti, F. [UNESP] Moreira F°, O. De Almeida Toledo F°, S. |
description |
A study was carried out on mitotic and meiotic chromosomes of four species of the genus Astyanax (Pisces, Characidae) from three different water basins in the State of São Paulo, Brazil. The following karyotypic characteristics were observed: A. bimaculatus, 2n = 50 (n = 25, FN = 86-88); A. fasciatus, 2n = 46 (n = 23, FN = 90); « A. fasciatus » from the Juquiá river, 2n = 48 (n = 24, FN = 94); A. schubarti, 2n = 36 (n = 18, FN = 70) and A. scabripinnis paranae, 2n = 50 (n = 25, FN = 90-92). The diversity in the number and morphology of the chromosomes suggests a model of non-conservative karyotypic evolution in this genus, with chromosome rearrangements of the centric fusion/fission type and/or inversion playing an important role in these alterations. On the basis of its characteristics, A. schubarti has the most differentiated karyotype and, in view of the low diploid number and small number of subtelocentric-acrocentric chromosomes, is probably of most recent origin. The two karyotypes encountered in A. fasciatus raise the possibility that « A. fasciatus » from the Juquia river may represent a new subspecies, or even a new species, of fasciatus. The absence of karyotype differences between males and females, means that all four species lack differentiated sex chromosomes. © 1983 Taylor & Francis Group, LLC. |
publishDate |
1983 |
dc.date.none.fl_str_mv |
1983-01-01 2022-04-28T20:08:18Z 2022-04-28T20:08:18Z |
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/10.1080/00087114.1983.10797664 Caryologia, v. 36, n. 3, p. 235-244, 1983. 2165-5391 0008-7114 http://hdl.handle.net/11449/224788 10.1080/00087114.1983.10797664 2-s2.0-33747335205 |
url |
http://dx.doi.org/10.1080/00087114.1983.10797664 http://hdl.handle.net/11449/224788 |
identifier_str_mv |
Caryologia, v. 36, n. 3, p. 235-244, 1983. 2165-5391 0008-7114 10.1080/00087114.1983.10797664 2-s2.0-33747335205 |
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 |
235-244 |
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 |
|
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1808129217620082688 |