Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae)
Cytogenetic and morphological studies were carried out on nine local populations of Astyanax scabripinnis paranae. All populations exhibited 2n = 50 chromosomes as well as conspicuous differences involving karyotype morphology, number and position of nucleolar organizer regions (NORs) and amount and...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Genética
1998-01-01
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| Series: | Genetics and Molecular Biology |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000200005 |
| _version_ | 1811215552542146560 |
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| author | Maistro Edson Luis Oliveira Claudio Foresti Fausto |
| author_facet | Maistro Edson Luis Oliveira Claudio Foresti Fausto |
| author_sort | Maistro Edson Luis |
| collection | DOAJ |
| description | Cytogenetic and morphological studies were carried out on nine local populations of Astyanax scabripinnis paranae. All populations exhibited 2n = 50 chromosomes as well as conspicuous differences involving karyotype morphology, number and position of nucleolar organizer regions (NORs) and amount and/or locations of constitutive heterochromatin blocks. A quantitative study of the cytogenetic data showed that eight populations possessed different karyotypes. Morphological analyses based on nine measurements and two meristic parameters were effective in establishing clear identification of five populations. Comparative analysis of cytogenetic and morphological traits suggests that chromosomal changes have occurred at a more rapid rate than morphological differentiation. Despite the close morphological similarity found among some populations, chromosomal differentiation was identified in all of them, even in those presenting only small morphological differences. |
| first_indexed | 2024-04-12T06:25:42Z |
| format | Article |
| id | doaj.art-296d6733821c4700a71f73fea97f0843 |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-04-12T06:25:42Z |
| publishDate | 1998-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-296d6733821c4700a71f73fea97f08432022-12-22T03:44:11ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46851998-01-01212201206Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae)Maistro Edson LuisOliveira ClaudioForesti FaustoCytogenetic and morphological studies were carried out on nine local populations of Astyanax scabripinnis paranae. All populations exhibited 2n = 50 chromosomes as well as conspicuous differences involving karyotype morphology, number and position of nucleolar organizer regions (NORs) and amount and/or locations of constitutive heterochromatin blocks. A quantitative study of the cytogenetic data showed that eight populations possessed different karyotypes. Morphological analyses based on nine measurements and two meristic parameters were effective in establishing clear identification of five populations. Comparative analysis of cytogenetic and morphological traits suggests that chromosomal changes have occurred at a more rapid rate than morphological differentiation. Despite the close morphological similarity found among some populations, chromosomal differentiation was identified in all of them, even in those presenting only small morphological differences.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000200005 |
| spellingShingle | Maistro Edson Luis Oliveira Claudio Foresti Fausto Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) Genetics and Molecular Biology |
| title | Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) |
| title_full | Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) |
| title_fullStr | Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) |
| title_full_unstemmed | Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) |
| title_short | Comparative cytogenetic and morphological analysis of Astyanax scabripinnis paranae (Pisces, Characidae, Tetragonopterinae) |
| title_sort | comparative cytogenetic and morphological analysis of astyanax scabripinnis paranae pisces characidae tetragonopterinae |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000200005 |
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