Comportamento reprodutivo de Volatinia jacarina jacarina (Linnaeus, 1766) em cativeiro (Passeres, Emberizidae)

Abstract

Six pairs (Linnaeus, 1766), é encontrado com bastante freqüência em ambientes abertos onde predominam as gramíneas, áreas cultivadas e terrenos baldios dos bairros periféricos das cidades (Marcondes-Machado, 1976).Esta espécie tem ampla distribuição geográfica, sendo encontrada desde o sul do México até o norte da Argentina (Pinto, 1944). A subespé-cie V. jacarina encontra-se restrita ao leste e centro do Brasil, Maranhão e Mato Grosso, sul a sudeste do Peru, leste da Bolívia, Paraguai, e norte da Argentina, sul de Mendoza, Córdoba e Buenos Aires, não tendo sido assinalada no Uruguai (Painter & Storer, 1970).A subspécie V. j. spledens foi estudada em condições -naturais tanto por Barnard (1956) e Alderton (1963) no Panamá, como por Carvalho (1957 no Pará (Brasil). Quanto a subespécie V. j. jacarina, esta foi muito pouco estudada do ponto de vista de sua biologia e comportamento reprodutivos. Alguns dados sobre ovos e tipo de ninhos podemos encontrar nos trabalhos de Euler (1900) e Von Ihering (1900).

Reproduction of Blue-black Grassquits in central Brazil

“…The aspect and the location of the nests, usually built among grassy branches, are in accordance with previous studies (Carvalho, 1957;Alderton, 1963;Marcondes-Machado, 1988;Almeida and Macedo, 2001). The observation that both sexes participate actively in the construction of the nest confirms the male role in parental investment observed in previous studies (Carvalho, 1957;Alderton, 1963;Almeida and Macedo, 2001).…”

“…Although there are some differences concerning the color of the eggs, in general, the information relative to morphologic characteristics of eggs, laying interval, and length of incubation, was not distinct from previous studies (Carvalho, 1957;Alderton, 1963;Marcondes-Machado, 1988). The pattern of two eggs per nest differs from that described by Alderton, (1963) in Panama, where most of the nests contained three eggs.…”

“…This variation in the number of eggs per nest is probably related to characteristics of the habitats where the species has been studied. The average period of permanence of the nestling in the nest did not differ from previous studies (Carvalho, 1957;Alderton, 1963;Marcondes-Machado, 1988).…”

New record of aberrant plumage in Blue-black Grassquit (Volatinia jacarina Linnaeus, 1766, aves: Emberizidae)

“…The Blue-black Grassquit Volatinia jacarina (Linnaeus, 1766), popularly known in Brazil as "tiziu", is an inhabitant of open areas, and also common near cities (Marcondes-Machado, 1988). The most remarkable characteristic of this species is the male blackish blue iridescent plumage, especially during the reproductive season (Queiroz, 2008).…”