Detalhes bibliográficos
| Ano de defesa: |
2005 |
| Autor(a) principal: |
Lacerda, Maria Conceição Vieira |
| Orientador(a): |
Maistro, Edison Luis
 |
| Banca de defesa: |
Moreira Filho, Orlando
,
Margarido, Vladimir Pavam
|
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Jose do Rosario Vellano
|
| Programa de Pós-Graduação: |
Programa de Mestrado em Ciência Animal
|
| Departamento: |
Zootecnia e Recursos Pesqueiros
|
| País: |
BR
|
| Palavras-chave em Português: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://tede2.unifenas.br:8080/jspui/handle/jspui/97
|
Resumo: |
Three sympatric species of Gymnotus from the Fundo stream a small tributary of the Sapucaí river Minas Gerais State Brazil were studied in relation to their karyology Gymnotus sylvius presented 2n = 40 chromosomes (36 m/sm + 4 st/a) Gymnotus sp presented 2n = 50 (44 m/sm + 6 st/a) and Gymnotus paraguensis had 2n = 54 (50 m/sm + 4 st/a) C-banding demonstrated positively stained heterochromatic blocks in the centromeric position of few chromosomes on G sylvius and in the centromeric region of all chromosomes on G paraguensis samples The nucleolus organizer region (NOR) was located on the short arm of one st chromosome pair in G sylvius and Gymnotus sp and in the interstitial position on the short arm of the pair number one and below the centromere on a third chromosome on G paraguensis The cytogenetic data obtained indicate that Gymnotus sp represent a new Gymnotus species with a karyotypic constitution never observed on other species from this genus Some aspects related to the chromosome diversification of these Gymnotus are discussed |
