Title
Female collared flycatchers adjust yolk testosterone to male age, but not to attractiveness Female collared flycatchers adjust yolk testosterone to male age, but not to attractiveness
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
New York, NY ,
Subject
Psychology
Chemistry
Biology
Human medicine
Source (journal)
Behavioral ecology / International Society for Behavioral Ecology. - New York, NY
Volume/pages
16(2005) :2 , p. 383-388
ISSN
1045-2249
ISI
000227126700009
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The differential allocation hypothesis predicts that females invest more resources into reproduction when mating with attractive males. In oviparous animals this can include prefertilization decisions such as the production of larger eggs and the deposition of hormones, such as the steroid testosterone, into yolks. On the other hand, a compensatory hypothesis posits that females allocate more resources into the eggs when mated with males of inferior quality. In the present study, we show that free-living females of the collared flycatcher (Ficedula albicollis), a small passerine bird, do not produce larger eggs or deposit more testosterone into eggs when mating with attractive males reflected by a large forehead patch size, which is contrary to the prediction of the differential allocation hypothesis. However, we found higher yolk testosterone concentrations in eggs laid for young than older males. Because in young males genetic quality, parental experience, or willingness to invest into paternal care is likely to be low, high yolk testosterone level in their clutches may indicate that their females follow a compensatory tactic. They may elicit more paternal care from young, inexperienced males by hormonally increasing nestling begging. Laying date was also correlated with yolk testosterone level; however, when we controlled for it, male age still remained a strong determinant of testosterone allocation.
E-info
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