Sentinels in Saltator atricollis (Passeriformes: Emberizidae)
Rev. bras. biol
;
61(2): 317-322, May 2001. graf, tab
Article
in English
| LILACS
| ID: lil-298648
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 percent 9 percent 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 percent 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
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Wakefulness
/
Behavior, Animal
/
Songbirds
Limits:
Animals
Language:
English
Journal:
Rev. bras. biol
Journal subject:
Biology
Year:
2001
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Unesp/BR
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