First description of nests, eggs, and nestlings of the Pearly-bellied Seedeater /Primeira descricao dos ninhos, ovos e filhotes do Caboclinho-branco (Sporophila pileata)

• Published in: The Wilson journal of ornithology 2018-09, Vol.130 (3), p.823
• Main Authors: Freitas, Maikon S, Medolago, Cesar A.B, Costa, Mariellen C, Telles, Marina, Francisco, Mercival R, Motta-Junior, Jose Carlos
• Format: Article
• Language: English
• Subjects: Company distribution practices; Emberizidae
• ISSN: 1559-4491

The "capuchinos" form a monophyletic group within the Neotropical seedeaters of the genus Sporophila and are typically smaller than the other congeners. Many of the 12 species of this group are endangered, but reproductive information is scarce for most of them. Here we present the descriptions of nests, eggs, nestlings, and nesting habitats for the Pearly-bellied Seedeater (Sporophila pileata). From 2012 to 2017 we found 83 nests constructed in herbaceous plants present in open marshlands, 15-73 cm above water or humid ground. Nests were deep cups built of grass stems, inflorescences, and rootlets, attached with spider web. Nests measured 59.3 [+ or -] 4.7 mm outside diameter, 50.7 [+ or -] 6.5 mm outside height, 41.6 [+ or -] 3.2 mm internal diameter, and 35.7 [+ or -] 3.3 mm internal depth. Eggs were oval with white, grayish, or greenish background color with black and brown spots mainly in the obtuse pole. They weighed 1.2 [+ or -] 0.1 g and measured 16.3 [+ or -] 0.8 per 12.2 [+ or -] 0.3 mm. Clutches consisted of 1-3 eggs. Our study sites represent the northernmost reproductive areas ever documented for a migratory capuchino. Received 21 June 2017. Accepted 2 April 2018. Key words: birds, breeding biology, reproduction, nesting behavior. Os "caboclinhos" forniam um grupo monofiletico dentro dos papa-capins neotropicais do genero Sporophila e sao tipicamente menores que os outros congeneres. Muitas das 12 especies deste grupo estao ameacadas de extincao, no entanto, informacoes sobre a biologia reprodutiva sao escassas para a maioria delas. Aqui nos apresentamos a descricao dos ninhos, ovos, filhotes c os habitats utilizados para a nidificacao do caboclinho-branco (Sporophila pileata). Entre 2012 a 2017 nos encontramos um total de 83 ninhos construidos a 15 - 73 cm acima da agua ou do solo Amido, em vegetacao herbacea em campos sazonalmente inundaveis. Os ninhos foram em formato de taca profunda construidos com hastes, inflorescencias e raizes de gramineas e foram fixados com teias de aranha. Eles mediram 59.3 [+ or -] 4.7 mm de diametro externo, 50.7 [+ or -] 6.5 mm de altura externa, 41.6 [+ or -] 3.2 mm de diametro interno e 35.7 [+ or -] 3.3 mm de profundidade. Os ovos foram ovais, com coloracao de fundo branca, acinzentada c esverdeada e com manchas pretas e marrons distribuidas principalmente no polo maior. Eles pesaram 1.2 [+ or -]0.1 g e mediram 16.3 [+ or -] 0.8 por 12,2 [+ or -] 0.3 mm. As ninhadas foram de um a tres ovos. Nossos locais de e