Biologia e sucesso reprodutivo de Sicalis Citrina Pelzeln, 1870 : (Aves: Emberizidae) no Distrito Federal

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The Stripe-tailed Yellow-Finch Sicalis citrina (Emberizidae) is a poorly known species with a wide range in South America. The first chapter of this study details its breeding biology. In the second chapter ecological hypothesis on the factors that possibly affect nest survival are tested. Estimates of daily survival rates and reproductive success are given as well in the last chapter. Nest search and monitoring were conducted between January and May 2007 and started after the beginning of raining season. Stripe-tailed Yellow-finches breed in abandoned mining pits in the Brasília National Park from December to May, most frequently from January to March. Its life history traits are quite similar to most Neotropical Emberizidae passerines. Eggs, from two-three, are laid in an open cup nest built mainly in Pteridophytae shrubs (Dicranopteris flexuosa). Incubation lasts 12 days and nestlings take 13 days to fledge. Nest apparent success was 26%. Daily survival rates and overall success using Mayfields method were 0.94 and 21%, respectively. Overall nest survival probabilities varied greatly as a function of substrate (plant species) and time of breeding season, being greater in nests built in Pteridophytae late in the breeding season. Daily survival rates also decreases as the nests get older. Edge effects did not influence nest survival.

ASSUNTO(S)

nest survival brazilian savanna sobrevivência de ninhos história de vida stripe-tailed yellow-finch sicalis citrina cerrado ecologia life history traits sicalis citrina

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