Data/hora: 01/06/2024 01:10:02

Provedor de dados: | 48
País: | Chile
Título: | Coexistence of cytotypes and chromosomal mosaicism in Hoplias malabaricus (Characiformes, Erythrinidae)
Autores: | DA ROSA,RENATA; RUBERT,MARCELÉIA; BERTOLLO,LUIZ A C; MARTINS-SANTOS,ISABEL C; GIULIANO-CAETANO,LUCIA.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Hoplias malabaricus; Chromosomal mosaicism; Coexistence of cytotypes; RAPD; Reproductive isolation.
Resumo: | Karyotypes of seventeen Hoplias malabaricus specimens, collected in the fish culture station of UNOPAR (University of Northern Paraná), were analyzed. The station is in the Claro River system in the Tibagi River basin. Two distinct and coexistent karyotype forms (cytotypes) were identified, comprising either 42 chromosomes (cytotype A) or 40 chromosomes (cytotype C), both presenting metacentric and submetacentric chromosomes. In two specimens, one male and one female, it was not possible to characterize a modal diploid number because different cell lines were observed, with a predominance of 2n=41 and 2n=42 chromosomes at a frequency of 38.24% and 41.12%, respectively. The karyotype with 2n=41 showed some putative monosomic and trisomic chromosomes, while the karyotype with 2n=42 showed 21 chromosomal pairs, similar to cytotype A. RAPD analysis showed that these two specimens have the same band pro file of cytotype A (Nei's genetic identity=92%), discarding a possible hybridization between both cytotypes and supporting the mosaicism hypothesis. These findings corroborate the isolation between cytotypes A and C.
Tipo: | Journal article
Idioma: | Inglês
Identificador: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300003
Editor: | Sociedad de Biología de Chile
Formato: | text/html
Fonte: | Biological Research  v.42 n.3 2009