Title
Within clutch co-variation of egg mass and sex in the black-headed gull Within clutch co-variation of egg mass and sex in the black-headed gull
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Basel ,
Subject
Biology
Source (journal)
Journal of evolutionary biology. - Basel
Volume/pages
18(2005) :3 , p. 661-668
ISSN
1010-061X
ISI
000228396800017
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Female birds of several species have control over the production of daughters and sons. However, most studies failed to find a relationship between egg size and sex. This is intriguing as adjustment of egg size would constitute a powerful tool for the female to meet different resource demands of the sexes, particularly in size dimorphic species. Our results show that, within clutches of black-headed gulls (Larus ridibundus) the proportion of males was positively associated with egg mass. This applied for all three laying positions, independently of the absolute egg mass. There was a significant relationship between the distribution of the sexes over the laying sequence and the egg mass change. When egg mass decreased over the sequence, first-laid eggs were male biased and last-laid eggs female biased, and vice versa. The potential adaptive value of this allocation strategy is evaluated with regard to male sensitivity to egg quality and competitive differences between the sexes.
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