| Registro completo |
| Provedor de dados: |
BJB
|
| 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 < 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
|
| Direitos: |
info:eu-repo/semantics/openAccess
|
