Data/hora: 06/06/2024 12:00:55

Provedor de dados: | 104
País: | Brazil
Título: | Cuidado parental de Sula leucogaster (Boddaert) (Aves, Pelecaniformes, Sulidae) nas Ilhas dos Currais, Paraná, Brasil
Autores: | Martins,Flávia de Campos; Dias,Manoel Martins.
Data: | 2003-12-01
Ano: | 2003
Palavras-chave: | Breeding; Brood reduction.
Resumo: | In Sula leucogaster (Boddaert, 1783) it happens a brood reduction from two to one egg. The eggs hatch asynchronously and it is rare for the second chick to survive for long. A quantify parental investment is proposed and the differences between males and females of Sula leucogaster is verified for to help to understand the brood reduction. The studies were conducted on Ilhas dos Currais, Paraná, Brazil, where a total of 140 nests were studied. Males and females shared the breeding care period. However, females invested about 8% more on incubation than males (c² = 7,37; c² critic = 3,842). Time of absence in the nest for females was larger than for males (c² = 13,9; c² critic = 3,842). This is probably a function of females bringing food to chicks more frequently (61%, n = 120) than males (c² = 5,63; c² critic = 3,842). The main parental investment during the phases with eggs and/or hatchings was protection, and during the postfledging period was to provide feeding. The brood reduction in S. leucogaster is due to the high cost of rearing two chicks during the same breeding attempt. This could be a disadvantage to the future survival and/or the reproduction of both parents and chicks.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Português
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000400004
Editor: | Sociedade Brasileira de Zoologia
Relação: | 10.1590/S0101-81752003000400004
Formato: | text/html
Fonte: | Revista Brasileira de Zoologia  v.20 n.4 2003
Fonte: | info:eu-repo/semantics/openAccess