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    The chemical basis of a signal of individual identity: shell pigment concentrations track the unique appearance of Common Murre eggs.

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    Authors
    Hauber, ME
    Bond, AL cc
    Kouwenberg, A-L
    Robertson, GJ
    Hansen, ES
    Holford, M
    Dainson, M
    Luro, A
    Dale, J
    Issue date
    2019-04-26
    Submitted date
    2019-05-22
    Subject Terms
    coloniality
    coloration
    discrimination
    individual recognition
    egg recognition
    maculation
    biomaterials
    evolution
    
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    Abstract
    In group-living species with parental care, the accurate recognition of one's own young is critical to fitness. Because discriminating offspring within a large colonial group may be challenging, progeny of colonial breeders often display familial or individual identity signals to elicit and receive parental provisions from their own parents. For instance, the common murre (or common guillemot: Uria aalge) is a colonially breeding seabird that does not build a nest and lays and incubates an egg with an individually unique appearance. How the shell's physical and chemical properties generate this individual variability in coloration and maculation has not been studied in detail. Here, we quantified two characteristics of the avian-visible appearance of murre eggshells collected from the wild: background coloration spectra and maculation density. As predicted by the individual identity hypothesis, there was no statistical relationship between avian-perceivable shell background coloration and maculation density within the same eggs. In turn, variation in both sets of traits was statistically related to some of their physico-chemical properties, including shell thickness and concentrations of the eggshell pigments biliverdin and protoporphyrin IX. These results illustrate how individually unique eggshell appearances, suitable for identity signalling, can be generated by a small number of structural mechanisms.
    Citation
    Hauber ME, Bond AL, Kouwenberg A-L, Robertson GJ, Hansen ES, Holford M, Dainson M, Luro A, Dale J. 2019 The chemical basis of a signal of individual identity: shell pigment concentrations track the unique appearance of Common Murre eggs. J. R. Soc. Interface 16: 20190115. http://dx.doi.org/10.1098/rsif.2019.0115
    Publisher
    Royal Society
    Journal
    J R Soc Interface
    URI
    http://hdl.handle.net/10141/622539
    DOI
    10.1098/rsif.2019.0115
    Type
    Journal Article
    Item Description
    & 2019 The Author(s) Published by the Royal Society. All rights reserved. This document is the authors' final accepted version of the journal article. You are advised to consult the published version if you wish to cite from it.
    EISSN
    1742-5662
    ae974a485f413a2113503eed53cd6c53
    10.1098/rsif.2019.0115
    Scopus Count
    Collections
    Life sciences

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