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2017 ; 302
(1
): 1-7
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Size of nest-cavity entrance influences male attractiveness and paternal
provisioning in house wrens
#MMPMID28579698
Will DS
; Dorset EE
; Thompson CF
; Sakaluk SK
; Bowers EK
J Zool (1987)
2017[May]; 302
(1
): 1-7
PMID28579698
show ga
In altricial birds, parental provisioning is plastic and can respond to a variety
of environmental stimuli. In this study, we manipulated the size of entrances
into artificial nest cavities (i.e., nestboxes) in a population of house wrens
(Troglodytes aedon) as a means of manipulating a male's sexual attractiveness,
and examined changes in parental provisioning. Nest cavities with large entrances
are less desirable as nesting sites, and the males at these sites are less
attractive to females. Therefore, we predicted that males at boxes that had large
entrances would invest more in parental care (i.e., those that succeeded in
finding a mate would provision their offspring at a higher rate) than males at
nestboxes with small entrances. As predicted, males provisioned their offspring
with food at the highest rates at nestboxes with enlarged entrances, and male
provisioning effort positively predicted the number of fledglings they produced
per egg. Males at these boxes provisioned more than their mates and more than
females and males at nestboxes with small entrances. At nestboxes with small
entrances, males provisioned at the same rate as females, and female provisioning
did not differ significantly between treatments, on average. Male and female
provisioning rates were negatively correlated, such that the increase in
provisioning by males at nestboxes with enlarged entrances did not enhance
nestling condition, likely because food delivery by females declined with
increased provisioning by males. However, the amount of time females spent
providing warmth for their ectothermic young increased with increases in male
provisioning, suggesting that levels of male parental care altered the mode, not
necessarily the extent, of care provided by females. These findings suggest that
male provisioning is related to sexual attractiveness, and that sexual conflict
over biparental care may not be as simple as the assessment of food provisioning
might otherwise suggest.