Tiziu


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Tiziu


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Tiziu


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O Tiziu, nome vulgar utilizado para identificar Volatinia jacarina, é um passarinho da Família Emberizidae, que mede cerca de 11,4cm. Estes pequenos pássaros são vistos com grande freqüência, geralmente aos pares, em áreas alteradas, descampados, savanas, campos e capoeiras baixas da América do Sul, exceto no extremo sul. Alimentam-se principalmente de sementes verdes, encontradas no próprio colmo das gramíneas ou no chão, ou de insetos. Adultos e jovens, fora da época reprodutiva, são pardo-oliváceos no dorso e levemente amarelados no abdômen, com estrias no peito e flancos. Os machos adultos, durante a época de acasalamento, assumem uma brilhante plumagem nupcial preto-azulada, com uma mancha branca nas penas axilares. Estes são facilmente reconhecidos nesse período pois, além da coloração nupcial vistosa, executam uma exibição que consiste de pequenos vôos verticais, ao mesmo tempo em que fazem vocalização da qual resultou seu nome: "tis-ziu". o vôo é repetido seguidamente, sobre o mesmo puleiro, em média cerca de 12 a 14 vezes por minuto, e com pequenos intervalos entre as repetições. Essa exibição é executada principalmente durante a época reprodutiva: todo ano em Belém, no Pará, e restrito ao verão em regiões meridionais, em função da alteração na oferta de recursos alimentares. Através das exibições, os machos delimitam seus pequenos territórios, que podem variar de cerca de 13 a 73m2, também atraindo as fêmeas para o acasalamento. O ninho, feito com raízes emaranhadas e com formato de taça, é construído dentro do território do macho, sempre a 50cm ou menos do chão, recebendo normalmente uma postura de dois ovos. Tanto o macho quanto a fêmea participam dos cuidados com os filhotes.

JULIANA BOSI DE ALMEIDA Programa de Pós-graduação em Ecologia Universidade de Brasília 


 

 The Tiziu, popular name for the Volatinia jacarina, is a bird of the Emberizidae family, whose size is 11.4 centimeters. These small birds, usually in pairs, are frequently seen in plains, prairies, open fields and cleared tracts of land in South America, except in its Southernmost part. They feed mainly upon insects or green seeds, which are collected in the stem of gramineous plants or on the ground. Whenever they are out of their reproductive season, the adult and young bird's back looks dark gray with shades of olive green, while its abdomen looks yellowish with lines on the chest and flank. During their breeding season, the adult male takes up a shiny bluish black nuptial feathering, with white spots in the axillary feathers. They are easily recognized in this period because, besides wearing their showy nuptial feathering, they perform vertical flights, while singing the sound they are named for: "tis-ziu". These flights are repeated over the same spot, at a rate of 12 to 14 times a minute, with short intervals among them. This performance takes place mainly during their reproductive season, which lasts basically all year round in Belém, State of Pará, and is restricted to the summertime in Southern regions. due to variations in food resource. Through these performances, males draw the lines of their small territories, which may range from 13 to 73 square meters, and also attract females for breeding. The nest is built with woven roots in the shape of a cup. It is within the male's territory, always up to 50-centimeter high, and usually receives an offspring of two eggs. Both male and female take part in looking after their issue.

JULIANA BOSI DE ALMEIDA Graduation Program in Ecology University of Brasília

 


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Last updated: 12/22/11.


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 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
For problems or questions and advertising regarding this Web site contact email vivabrazil.
Last updated: 12/22/11.


Home | Brazilian Regions | This is Brazil | What is new | Search Help | Contact Information

 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
For problems or questions and advertising regarding this Web site contact email vivabrazil.
Last updated: 12/22/11.


Home | Brazilian Regions | This is Brazil | What is new | Search Help | Contact Information

 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
For problems or questions and advertising regarding this Web site contact email vivabrazil.
Last updated: 12/26/11.