Rapid development of brood-parasitic cuckoo embryos cannot be explained by increased gas exchange through the eggshell

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dc.contributor.authorPortugal, S.
dc.contributor.authorHauber, M.
dc.contributor.authorMaurer, G.
dc.contributor.authorStokke, B.
dc.contributor.authorGrim, T.
dc.contributor.authorCassey, P.
dc.date.issued2014
dc.descriptionArticle first published online: 21 MAY 2014
dc.description.abstractObligate avian brood parasites lay their eggs in hosts' nests and play no role in the provisioning of the progeny. Many parasites, including Cuculus cuckoos, hatch before their hosts and the altricial chick evicts hosts eggs and nestlings. A hypothesized, but so far untested parasite adaptation is that the embryos of cuckoos develop more quickly than the hosts' because the higher porosity of the parasite's eggshell allows greater gaseous exchange, potentially supporting more rapid development. We compared the water vapour conductance (GH2O) of common cuckoo (Cuculus canorus) eggshells and those of several passerines, including various cuckoo host species, and non-passerine species. Contrary to the prediction, the cuckoo eggs had lower GH2O than eggs of their hosts, and lower GH2O than predicted for their egg size and phylogeny. A potential advantage for the cuckoo egg of having a lower GH2O may be that the yolk is depleted at a slower rate, allowing more reserves to remain at the end of incubation, assisting the embryo with the energetically demanding tasks of hatching from a thicker eggshell, and evicting host eggs and nestmates.
dc.description.statementofresponsibilityS. J. Portugal, M. E. Hauber, G. Maurer, B. G. Stokke, T. Grim and P. Cassey
dc.identifier.citationJournal of Zoology, 2014; 293(4):219-226
dc.identifier.doi10.1111/jzo.12144
dc.identifier.issn0952-8369
dc.identifier.issn1469-7998
dc.identifier.orcidCassey, P. [0000-0002-2626-0172]
dc.identifier.urihttp://hdl.handle.net/2440/92114
dc.language.isoen
dc.publisherWiley
dc.rights© 2014 The Zoological Society of London
dc.source.urihttps://doi.org/10.1111/jzo.12144
dc.subjectCuculus canorus; conductance; eggshell porosity; parasite; permeability
dc.titleRapid development of brood-parasitic cuckoo embryos cannot be explained by increased gas exchange through the eggshell
dc.typeJournal article
pubs.publication-statusPublished

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