Sentinels in Saltator atricollis (Passeriformes: Emberizidae)
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Brasileira de Biologia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200015 |
Resumo: | I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests that the ability of sentinels to detect predators may play a central role as an anti-predator device. |
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Sentinels in Saltator atricollis (Passeriformes: Emberizidae)EmberizidaeBrazilian savannaraptorsalertnesssentinelsI studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests that the ability of sentinels to detect predators may play a central role as an anti-predator device.Instituto Internacional de Ecologia2001-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200015Revista Brasileira de Biologia v.61 n.2 2001reponame:Revista Brasileira de Biologia (Online)instname:Instituto Internacional de Ecologia (IIE)instacron:IIE10.1590/S0034-71082001000200015info:eu-repo/semantics/openAccessRAGUSA-NETTO,J.eng2001-08-16T00:00:00Zoai:scielo:S0034-71082001000200015Revistawww.scielo.br/rbbioONGhttps://old.scielo.br/oai/scielo-oai.php||bjb.iie@terra.com.br1806-96060034-7108opendoar:2001-08-16T00:00Revista Brasileira de Biologia (Online) - Instituto Internacional de Ecologia (IIE)false |
dc.title.none.fl_str_mv |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
title |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
spellingShingle |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) RAGUSA-NETTO,J. Emberizidae Brazilian savanna raptors alertness sentinels |
title_short |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
title_full |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
title_fullStr |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
title_full_unstemmed |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
title_sort |
Sentinels in Saltator atricollis (Passeriformes: Emberizidae) |
author |
RAGUSA-NETTO,J. |
author_facet |
RAGUSA-NETTO,J. |
author_role |
author |
dc.contributor.author.fl_str_mv |
RAGUSA-NETTO,J. |
dc.subject.por.fl_str_mv |
Emberizidae Brazilian savanna raptors alertness sentinels |
topic |
Emberizidae Brazilian savanna raptors alertness sentinels |
description |
I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests that the ability of sentinels to detect predators may play a central role as an anti-predator device. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001-05-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200015 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200015 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0034-71082001000200015 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Instituto Internacional de Ecologia |
publisher.none.fl_str_mv |
Instituto Internacional de Ecologia |
dc.source.none.fl_str_mv |
Revista Brasileira de Biologia v.61 n.2 2001 reponame:Revista Brasileira de Biologia (Online) instname:Instituto Internacional de Ecologia (IIE) instacron:IIE |
instname_str |
Instituto Internacional de Ecologia (IIE) |
instacron_str |
IIE |
institution |
IIE |
reponame_str |
Revista Brasileira de Biologia (Online) |
collection |
Revista Brasileira de Biologia (Online) |
repository.name.fl_str_mv |
Revista Brasileira de Biologia (Online) - Instituto Internacional de Ecologia (IIE) |
repository.mail.fl_str_mv |
||bjb.iie@terra.com.br |
_version_ |
1754821093903826944 |