Vol 9 Num 1




Breeding biology of Tyrannus  savana  (Aves, Tyrannidae) in cerrado of Central Brazil

Miguel Ângelo Marini

Universidade de Brasília
Departamento de Zoologia, IB, Universidade de Brasília, 70910-900, Brasília, DF
email: marini@unb.br

Yonara Lobo

Universidade de Brasília
Departamento de Zoologia, IB, Universidade de Brasília, 70910-900, Brasília, DF
Leonardo Esteves Lopes

Universidade de Brasília / Universidade Federal de Minas Gerais
Programa de Pós-graduação em Biologia Animal, IB, Universidade de Brasília, 70910-900, Brasília, DF / Laboratório de Ornitologia, Departamento de Zoologia, ICB, Universidade Federal de Minas Gerais, 31270-910, Belo Horizonte, MG
Leonardo Fernandes França

Universidade de Brasília
Programa de Pós-graduação em Ecologia, IB, Universidade de Brasília, 70910-900, Brasília, DF
Luciana Vieira de Paiva

Universidade de Brasília
Programa de Pós-graduação em Ecologia, IB, Universidade de Brasília, 70910-900, Brasília, DF

keywords
Nesting, Neotropical, predation, reproductive biology, reproductive success

publication date: 01-19-2009





Abstract
The Fork-tailed Flycatcher Tyrannus  savana  (Tyrannidae) is a migratory passerine that occurs in central Brazil between of August and February. Its breeding biology is still little known, and this study reports data on breeding season, incubation and nestling period, nest and eggs characteristics, nest success and predation rate. We searched for nests at "Estação Ecológica de Águas Emendadas" (ESECAE) and its surroundings, Distrito Federal, Brazil, in the breeding seasons of 2002 to 2007. We monitored 78 nests each 2-4 days. Breeding season started in late September and lasted until mid December. Incubation lasted 13.6 ± 0.4 days (n = 21) (mean ± SE) and nestling period lasted 15 ± 0.4 days (n = 27). Most nests (n = 39) were found in "cerrado ralo" vegetation and were built on plants of the genus Kielmeyera . Clutch size ranged from 1 to 3 eggs, with an average of 2.5 ± 0.3 eggs. Egg length and width averaged 22.2 ± 0.2 mm and 15.8 ± 0.1 mm (n = 6), respectively, and the average weight was 3.0 ± 0.2 g (n = 5). Thirty (52.5%) nests were successful, 24 (43.9%) were predated and only two (3.7%) were abandoned. Egg success was 39.2% ± 1.4 and mean hatching rate was 0.58 ± 0.2 fledlings/eggs. Overall productivity was 1.0 ± 0.3 fledglings per nest, and fecundity rate was 1.4 ± 0.4 fledglings per female. Nest success (Mayfield method) was 45.9% ± 1.1, with no significant difference between the average daily survival rate between egg and nestling periods. Several of the estimated parameters for Tyrannus  savana  revealed to be different than expected for a tropical flycatcher.

how to quote this paper
Marini, M.A.; Lobo, Y.; Lopes, L.E.; França, L.F.; and Paiva, L.V. Breeding biology of Tyrannus  savana  (Aves, Tyrannidae) in cerrado of Central Brazil. Biota Neotrop.  Jan/Mar 2009 vol. 9, no. 1 http://www.biotaneotropica.org.br/v8n4/en/abstract?article+bn01009012009 ISSN 1676-0603.

Cited species
check for this species in other resources  Kielmeyera 
check for this species in other resources Tyrannus  savana 



Fundação de Amparo à Pesquisa do Estado de São Paulo, Fapesp
Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq
© BIOTA NEOTROPICA, 2009