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2015 ; 18
(1
): 299-305
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Who moved my eggs? An experimental test of the egg arrangement hypothesis for the
rejection of brood parasitic eggs
#MMPMID25194716
Hanley D
; Sama? P
; Hauber ME
; Grim T
Anim Cogn
2015[Jan]; 18
(1
): 299-305
PMID25194716
show ga
Avian brood parasitism is an exceptional reproductive strategy whereby parasites
reduce their own costs associated with parental care and impose them on the host
parents. Consequently, host species have evolved multiple defensive mechanisms to
combat parasitism. The vast majority of research attention to date has examined
host defenses to recognize and reject parasitic eggs. The recently proposed "egg
arrangement hypothesis" suggests that hosts may not focus solely on individual
eggs' features, but instead the overall arrangement of the clutch may also
provide a cue that parasitism has occurred. Correlative data revealed that host
females maintaining a consistent egg arrangement across the incubation period
were more likely to reject foreign egg models than females that did not keep a
consistent egg arrangement. Here, we provide the first experimental test of this
hypothesis in the European blackbird (Turdus merula). We experimentally
parasitized nests such that the egg arrangement was either disrupted or not
disrupted. We found no evidence that altered egg arrangement was used as a cue
for egg rejection by host females. Therefore, we suggest that females that keep
consistent egg arrangement are more likely to eject foreign eggs for other
correlated reasons. Thus, egg arrangement does not serve as an independent cue to
trigger egg rejection responses to parasitism in this host species.