| Registro completo |
| Provedor de dados: |
Neotropical Ichthyology
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| País: |
Brazil
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| Título: |
Ecology of Phallotorynus pankalos (Cyprinodontiformes: Poeciliidae) in a first-order stream of the upper Paraná Basin
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| Autores: |
Súarez,Yzel R.
Silva,João Paulo da
Vasconcelos,Lilian P.
Antonialli-Júnior,William Fernando
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| Data: |
2009-03-01
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| Ano: |
2009
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| Palavras-chave: |
Fecundity
Iguatemi River Basin
Population ecology
Reproduction
Stream fish
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100007
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| Editor: |
Sociedade Brasileira de Ictiologia
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| Relação: |
10.1590/S1679-62252009000100007
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| Formato: |
text/html
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| Fonte: |
Neotropical Ichthyology v.7 n.1 2009
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| Direitos: |
info:eu-repo/semantics/openAccess
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