Alternative mechanisms of increased eggshell hardness of avian brood parasites relative to host species

Branislav Igic, Kim Braganza, Margaret M. Hyland, Heather Silyn-Roberts, Phillip Cassey, Tomas Grim, Jarkko Rutila, C. Moskát, Mark E. Hauber

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Obligate brood parasitic birds lay their eggs in nests of other species and parasite eggs typically have evolved greater structural strength relative to host eggs. Increased mechanical strength of the parasite eggshell is an adaptation that can interfere with puncture ejection behaviours of discriminating hosts. We investigated whether hardness of eggshells is related to differences between physical and chemical traits from three different races of the parasitic common cuckoo Cuculus canorus, and their respective hosts. Using tools developed for materials science, we discovered a novel correlate of increased strength of parasite eggs: the common cuckoo's egg exhibits a greater microhardness, especially in the inner region of the shell matrix, relative to its host and sympatric non-host species. We then tested predictions of four potential mechanisms of shell strength: (i) increased relative thickness overall, (ii) greater proportion of the structurally harder shell layers, (iii) higher concentration of inorganic components in the shell matrix, and (iv) elevated deposition of a high density compound, MgCO 3, in the shell matrix. We confirmed support only for hypothesis (i). Eggshell characteristics did not differ between parasite eggs sampled from different host nests in distant geographical sites, suggesting an evolutionarily shared microstructural mechanism of stronger parasite eggshells across diverse host-races of brood parasitic cuckoos.

Original languageEnglish
Pages (from-to)1654-1664
Number of pages11
JournalJournal of the Royal Society Interface
Volume8
Issue number64
DOIs
Publication statusPublished - Nov 7 2011

Fingerprint

Egg Shell
Hardness
Eggs
Parasites
Birds
Materials science
Punctures
Microhardness
Strength of materials
Ovum

Keywords

  • Host-parasite coevolution
  • Microhardness
  • Puncture ejection
  • Recognition systems

ASJC Scopus subject areas

  • Biophysics
  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Biomaterials
  • Biochemistry

Cite this

Igic, B., Braganza, K., Hyland, M. M., Silyn-Roberts, H., Cassey, P., Grim, T., ... Hauber, M. E. (2011). Alternative mechanisms of increased eggshell hardness of avian brood parasites relative to host species. Journal of the Royal Society Interface, 8(64), 1654-1664. https://doi.org/10.1098/rsif.2011.0207

Alternative mechanisms of increased eggshell hardness of avian brood parasites relative to host species. / Igic, Branislav; Braganza, Kim; Hyland, Margaret M.; Silyn-Roberts, Heather; Cassey, Phillip; Grim, Tomas; Rutila, Jarkko; Moskát, C.; Hauber, Mark E.

In: Journal of the Royal Society Interface, Vol. 8, No. 64, 07.11.2011, p. 1654-1664.

Research output: Contribution to journalArticle

Igic, B, Braganza, K, Hyland, MM, Silyn-Roberts, H, Cassey, P, Grim, T, Rutila, J, Moskát, C & Hauber, ME 2011, 'Alternative mechanisms of increased eggshell hardness of avian brood parasites relative to host species', Journal of the Royal Society Interface, vol. 8, no. 64, pp. 1654-1664. https://doi.org/10.1098/rsif.2011.0207
Igic, Branislav ; Braganza, Kim ; Hyland, Margaret M. ; Silyn-Roberts, Heather ; Cassey, Phillip ; Grim, Tomas ; Rutila, Jarkko ; Moskát, C. ; Hauber, Mark E. / Alternative mechanisms of increased eggshell hardness of avian brood parasites relative to host species. In: Journal of the Royal Society Interface. 2011 ; Vol. 8, No. 64. pp. 1654-1664.
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