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Bioacoustics paper in Behav. Ecol. Sociobiol., 54(2)

Subject: Bioacoustics paper in Behav. Ecol. Sociobiol., 54(2)
From: Jérôme SUEUR <>
Date: Sun, 06 Jul 2003 11:51:54 -0700
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 <tt>Leonard ML, Horn AG, Parks, E 2003. The role of posturing and calling 
 in the begging display of nestling birds. Behavioral Ecology and 
 Sociobiology, 54 (2): 188-193</tt><br>
 Nestling birds produce a multicomponent begging display that has 
 visual (e.g. posturing) and vocal (e.g. call rate) elements. Most 
 work on the function of the display has focused on each component 
 separately. However, understanding the evolution of complex displays 
 such as begging requires knowledge of how the components function 
 collectively. The purpose of our study was to determine how postural 
 intensity and calling rate together influence parental feeding 
 decisions in tree swallows, tachycineta bicolor. We compared how 
 begging components responded to a manipulation in which pairs of 
 nestlings were either free to approach the parent when it arrived to 
 feed (unconfined treatment) or confined to the back of their nestbox 
 by a plexiglass partition (confined treatment). We found no 
 significant differences in postural intensity between treatments, but 
 calling rate was significantly higher in the confined treatment. In 
 both treatments, postural intensity, but not calling rate, correlated 
 with hunger. Both components positively and independently correlated 
 with the likelihood of a nestling being fed, although the correlation 
 with postural intensity was stronger. Previous work suggested that 
 both posture and call rate advertised hunger in nestling tree 
 swallows. Here, call rate was not associated with hunger, but rather 
 was affected by nestling position. These results suggest that calling 
 may serve an additional role in helping nestlings in disadvantaged 
 positions attract parental attention. The results also suggest that 
 calling may have a complex relationship with hunger, position and 
 <pre style="margin: 
 Jérôme SUEUR
 Ecole Pratique des Hautes Etudes,  Biologie et Evolution des Insectes
 Muséum national d'Histoire naturelle, 45 rue Buffon, 75005 Paris - France
 Ph. 00 33 1 40 79 31 57 / Fx. 00 33 1 40 79 36 99 / Ml. [EMAIL PROTECTED]

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