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Title: Referential alarm calling elicits future vigilance in a host of an avian brood parasite
Yellow warblers ( Setophaga petechia ) use referential ‘seet’ calls to warn mates of brood parasitic brown-headed cowbirds ( Molothrus ater ). In response to seet calls during the day, female warblers swiftly move to sit tightly on their nests, which may prevent parasitism by physically blocking female cowbirds from inspecting and laying in the nest. However, cowbirds lay their eggs just prior to sunrise, not during daytime. We experimentally tested whether female warblers, warned by seet calls on one day, extend their anti-parasitic responses into the future by engaging in vigilance at sunrise on the next day, when parasitism may occur. As predicted, daytime seet call playbacks caused female warblers to leave their nests less often on the following morning, relative to playbacks of both their generic anti-predator calls and silent controls. Thus, referential calls do not only convey the identity or the type of threat at present but also elicit vigilance in the future to provide protection from threats during periods of heightened vulnerability.  more » « less
Award ID(s):
1953226 1952726
NSF-PAR ID:
10309268
Author(s) / Creator(s):
 ;  ;  ;  ;  ;  ;  ;  
Date Published:
Journal Name:
Biology Letters
Volume:
17
Issue:
9
ISSN:
1744-957X
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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