Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream

Detalhes bibliográficos
Autor(a) principal: Porto-Foresti,Fábio
Data de Publicação: 1997
Outros Autores: Oliveira,Claudio, Maistro,Edson Luis, Foresti,Fausto
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Journal of Genetics
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551997000300004
Resumo: A study was made of the frequency of B-chromosomes and the population density of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) from three stretches of the Cascatinha stream (Botucatu, SP). In the first stretch the population was estimated to be about 212 individuals and among 35 karyotyped specimens, 23 carried one macro B-chromosome; in the second stretch the population was estimated to be about 650 individuals and among 20 specimens karyotyped, two possessed one macro B-chromosome; in the third stretch the population was estimated to be about 107 individuals and among 10 specimens karyotyped, one carried one macro B-chromosome. A significant difference was observed in the frequency of macro B-chromosomes in females (57%) and males (8.7%) (P = 0.0001). These data suggest that the B-chromosome frequency and the populational density are not directly related. The hypothesis of the existence of some adaptive effect conferred by the B-chromosomes to the specimens from the first stretch of the Cascatinha stream is presented and discussed
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spelling Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small streamA study was made of the frequency of B-chromosomes and the population density of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) from three stretches of the Cascatinha stream (Botucatu, SP). In the first stretch the population was estimated to be about 212 individuals and among 35 karyotyped specimens, 23 carried one macro B-chromosome; in the second stretch the population was estimated to be about 650 individuals and among 20 specimens karyotyped, two possessed one macro B-chromosome; in the third stretch the population was estimated to be about 107 individuals and among 10 specimens karyotyped, one carried one macro B-chromosome. A significant difference was observed in the frequency of macro B-chromosomes in females (57%) and males (8.7%) (P = 0.0001). These data suggest that the B-chromosome frequency and the populational density are not directly related. The hypothesis of the existence of some adaptive effect conferred by the B-chromosomes to the specimens from the first stretch of the Cascatinha stream is presented and discussedSociedade Brasileira de Genética1997-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551997000300004Brazilian Journal of Genetics v.20 n.3 1997reponame:Brazilian Journal of Geneticsinstname:Sociedade Brasileira de Genética (SBG)instacron:SBG10.1590/S0100-84551997000300004info:eu-repo/semantics/openAccessPorto-Foresti,FábioOliveira,ClaudioMaistro,Edson LuisForesti,Faustoeng1998-10-06T00:00:00Zoai:scielo:S0100-84551997000300004Revistahttps://www.gmb.org.br/brazilian-journal-of-geneticsONGhttps://old.scielo.br/oai/scielo-oai.phpsede@sgb.org.br || sede@sgb.org.br0100-84550100-8455opendoar:1998-10-06T00:00Brazilian Journal of Genetics - Sociedade Brasileira de Genética (SBG)false
dc.title.none.fl_str_mv Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
title Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
spellingShingle Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
Porto-Foresti,Fábio
title_short Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
title_full Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
title_fullStr Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
title_full_unstemmed Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
title_sort Estimated frequency of B-chromosomes and population density of Astyanax scabripinnis paranae in a small stream
author Porto-Foresti,Fábio
author_facet Porto-Foresti,Fábio
Oliveira,Claudio
Maistro,Edson Luis
Foresti,Fausto
author_role author
author2 Oliveira,Claudio
Maistro,Edson Luis
Foresti,Fausto
author2_role author
author
author
dc.contributor.author.fl_str_mv Porto-Foresti,Fábio
Oliveira,Claudio
Maistro,Edson Luis
Foresti,Fausto
description A study was made of the frequency of B-chromosomes and the population density of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) from three stretches of the Cascatinha stream (Botucatu, SP). In the first stretch the population was estimated to be about 212 individuals and among 35 karyotyped specimens, 23 carried one macro B-chromosome; in the second stretch the population was estimated to be about 650 individuals and among 20 specimens karyotyped, two possessed one macro B-chromosome; in the third stretch the population was estimated to be about 107 individuals and among 10 specimens karyotyped, one carried one macro B-chromosome. A significant difference was observed in the frequency of macro B-chromosomes in females (57%) and males (8.7%) (P = 0.0001). These data suggest that the B-chromosome frequency and the populational density are not directly related. The hypothesis of the existence of some adaptive effect conferred by the B-chromosomes to the specimens from the first stretch of the Cascatinha stream is presented and discussed
publishDate 1997
dc.date.none.fl_str_mv 1997-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551997000300004
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551997000300004
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-84551997000300004
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Genética
publisher.none.fl_str_mv Sociedade Brasileira de Genética
dc.source.none.fl_str_mv Brazilian Journal of Genetics v.20 n.3 1997
reponame:Brazilian Journal of Genetics
instname:Sociedade Brasileira de Genética (SBG)
instacron:SBG
instname_str Sociedade Brasileira de Genética (SBG)
instacron_str SBG
institution SBG
reponame_str Brazilian Journal of Genetics
collection Brazilian Journal of Genetics
repository.name.fl_str_mv Brazilian Journal of Genetics - Sociedade Brasileira de Genética (SBG)
repository.mail.fl_str_mv sede@sgb.org.br || sede@sgb.org.br
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