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Rapid development of brood‐parasitic cuckoo embryos cannot be explained by increased gas exchange through the eggshell
Author(s) -
Portugal S. J.,
Hauber M. E.,
Maurer G.,
Stokke B. G.,
Grim T.,
Cassey P.
Publication year - 2014
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/jzo.12144
Subject(s) - biology , cuckoo , brood parasite , eggshell , altricial , hatching , passerine , zoology , brood , bird egg , obligate , ecology , host (biology) , parasitism
Obligate avian brood parasites lay their eggs in hosts' nests and play no role in the provisioning of the progeny. Many parasites, including C uculus 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 ( G H2O ) of common cuckoo ( C uculus 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 G H2O than eggs of their hosts, and lower G H2O than predicted for their egg size and phylogeny. A potential advantage for the cuckoo egg of having a lower G H2O 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.