Reproductive Biology of the Inseminating GlandulocaudineDiapoma speculiferumCope (Teleostei: Characidae)

Autor:	Clarice Bernhardt Fialho, Luiz Roberto Malabarba, Marco Aurélio Azevedo
Rok vydání:	2000
Předmět:	Teleostei biology Ecology Zoology Total body Aquatic Science biology.organism_classification Fecundity Diapoma speculiferum Characidae Reproductive period Pseudocorynopoma Reproductive biology Animal Science and Zoology Ecology Evolution Behavior and Systematics
Zdroj:	Copeia. 2000:983-989
ISSN:	1938-5110 0045-8511
DOI:	10.1643/0045-8511(2000)000[0983:rbotig]2.0.co;2
Popis:	The reproductive period of the inseminating glandulocaudine Diapoma speculiferum was determined through the analysis of 133 males and 158 females obtained from monthly collections in Rio Grande do Sul, Brazil. The reproductive period is highly seasonal, occurring from September to February, which corresponds to the Austral spring and summer. Both male and female gonadosomatic indices were highly correlated with changes in water temperature and day length and, to a lesser extent, food availability. No correlation with rainfall was found. Absolute fecundity (mean 491.1 ± 159.5 oocytes per female) was similar to those found in two externally fertilizing cheirodontine characids but lower than that found in the inseminating glandulocaudine Pseudocorynopoma doriae. Relative fecundities (oocyte number per milligram total body weight) of the inseminating D. speculiferum and P. doriae were found to be lower than that of two externally fertilizing cheirodontines, suggesting that inseminating species may ex...
Databáze:	OpenAIRE
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