Title
No sexual differences in embryonic period in jackdaws and black-headed gulls : **Larus ridibundus** No sexual differences in embryonic period in jackdaws and black-headed gulls : **Larus ridibundus**
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Copenhagen ,
Subject
Biology
Source (journal)
Journal of avian biology. - Copenhagen
Volume/pages
37(2006) :1 , p. 19-22
ISSN
0908-8857
ISI
000235238000004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Offspring survival probability usually decreases with hatching order, especially in species with brood reduction. Brood reduction in combination with a sex difference in embryonic period (the time between laying and hatching of an egg) can potentially have a profound effect on sex allocation, with higher investment in chicks of the early hatching sex because they are more likely to survive to fledge. Two recent studies reported sex differences in the embryonic period, but compared embryonic period between, rather than within, clutches, which does not control for possible environmental effects on both clutch sex ratio and embryonic period. We compared the embryonic period of sons and daughters within clutches in jackdaws Corvus monedula and black-headed gulls Larus ridibundus, two species with frequent brood reduction, and found no sexual difference in embryonic period. This suggests that sex allocation is not affected by sex differences in embryonic period in these species, but more studies are required to verify whether this is a general pattern.
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