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Provedor de dados:  Neotropical Ichthyology
País:  Brazil
Título:  Chromosome evolution in fishes: a new challenging proposal from Neotropical species
Autores:  Nirchio,Mauro
Rossi,Anna Rita
Data:  2014-12-01
Ano:  2014
Palavras-chave:  Actinopterygii
Ancestral karyotype
Diploid number
Fundamental number
Resumo:  We present a database containing cytogenetic data of Neotropical actinopterygian fishes from Venezuela obtained in a single laboratory for the first time. The results of this study include 103 species belonging to 74 genera assigned to 45 families and 17 out of the 40 teleost orders. In the group of marine fishes, the modal diploid number was 2n=48 represented in 60% of the studied species, while in the freshwater fish group the modal diploid complement was 2n=54, represented in 21.21 % of the studied species. The average number of chromosomes and the mean FN were statistically higher in freshwater fish than in marine fish. The degree of diversification and karyotype variation was also higher in freshwater fish in contrast to a more conserved cytogenetic pattern in marine fish. In contrast to the assumption according to which 48 acrocentric chromosomes was basal chromosome number in fish, data here presented show that there is an obvious trend towards the reduction of the diploid number of chromosomes from values near 2n=60 with high number of biarmed chromosomes in more basal species to 2n=48 acrocentric elements in more derived Actinopterygii.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Ictiologia
Relação:  10.1590/1982-0224-20130008
Formato:  text/html
Fonte:  Neotropical Ichthyology v.12 n.4 2014
Direitos:  info:eu-repo/semantics/openAccess

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