Comportamento

Cuidado parental de Sula leucogaster (Boddaert) (Aves, Pelecaniformes, Sulidae) nas Ilhas dos Currais, Paraná, Brasil Parental care in Sula leucogaster (Boddaert) (Aves, Pelecaniformes, Sulidae) on the Currais Islands, Paraná, Brazil

Flávia de Campos MartinsI; Manoel Martins DiasII
IPrograma de Pós-Graduação em Ecologia, Instituto de Ciências Biológicas, Universidade de Brasília. Asa Norte, 70910-900 Brasília, Distrito Federal, Brasil. E-mail: [e-mail]
IIDepartamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos. Caixa Postal 676, 13565-905 São Carlos, São Paulo, Brasil

ABSTRACT
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 (2 = 7,37; 2 critic = 3,842). Time of absence in the nest for females was larger than for males (2 = 13,9; 2 critic = 3,842). This is probably a function of females bringing food to chicks more frequently (61%, n = 120) than males (2 = 5,63; 2 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.
Key words: Breeding, brood reduction.

Investimento parental é qualquer comportamento dos pais que aumenta a probabilidade de um filhote