Data/hora: 13/06/2024 04:59:16

Provedor de dados: | Brazilian Journal of Biology
País: | Brazil
Título: | Raptors and "campo-cerrado" bird mixed flock led by Cypsnagra Hirundinacea (Emberizidae:Thraupinae)
Autores: | RAGUSA-NETTO,J.
Data: | 2000-08-01
Ano: | 2000
Palavras-chave: | Mixed flock; Sentinel; Thraupinae; Raptors; Nuclear species.
Resumo: | Bird mixed flocks including Cypsnagra hirundinacea and Neothraupis fasciata as species with sentinels were studied in "campo-cerrado" in order to investigate the possible relationship between alertness and the mixed flock leadership. This study was conducted from March to September 1996 and mixed flocks were observed on average for 2:30h. The time with sentinels were recorded for C. hirundinacea and N. fasciata. The sentinels of Cypsnagra hirundinacea performed most of the vigilance (time with sentinel was on average 42 ± 17%, 41 ± 17% of which by C. hirundinacea, whereas only 1.2 % by N. fasciata) and gave all the alarm calls recorded (54% of the encounters with raptors stimulated alarm calls). A relationship was verified between time with sentinel and the rate of encounters with raptor (ANOVA, F = 3.0, P &lt; 0.05). The results of this study are an evidence for the anti-predatory function of mixed flocks, in campo-cerrado, and the alertness as a major feature of a leader species, since C. hirundinacea always led those flocks.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300011
Editor: | Instituto Internacional de Ecologia
Relação: | 10.1590/S0034-71082000000300011
Formato: | text/html
Fonte: | Revista Brasileira de Biologia  v.60 n.3 2000
Fonte: | info:eu-repo/semantics/openAccess