Data/hora: 11/06/2024 04:43:52

Provedor de dados: | 83
País: | Brazil
Título: | Ecology of Phallotorynus pankalos (Cyprinodontiformes: Poeciliidae) in a first-order stream of the upper Paraná Basin
Autores: | Súarez,Yzel R.; Silva,João Paulo da; Vasconcelos,Lilian P.; Antonialli-Júnior,William Fernando.
Data: | 2009-03-01
Ano: | 2009
Palavras-chave: | Fecundity; Iguatemi River Basin; Population ecology; Reproduction; Stream fish.
Resumo: | Some aspects of the population ecology of Phallotorynus pankalos in a first-order stream of the Iguatemi River Basin are described based on samples taken from March/2007 to February/2008. A total of 2680 individuals, including 948 males and 1732 females was collected. Adult females are larger than males; theirs mean fecundity was estimated as 6.5 embryos/female. There was a strong correlation between standard length and ovary weight, relative ovary weight, and number of embryos. The size of the first maturation of 50% of female population was estimated as 18.24 mm of standard lenght. High female mortality was observed after the first reproduction and sex ratio presents seasonal variation with higher female proportion in the winter.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100007
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252009000100007
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.7 n.1 2009
Fonte: | info:eu-repo/semantics/openAccess