Jackson, D. orcid.org/0000-0003-4777-0275, Thompson, J., Hemmings, N. et al. (1 more author) (2018) Common guillemot (Uria aalge) eggs are not self-cleaning. The Journal of Experimental Biology, 221 (23). jeb188466. ISSN 0022-0949
Abstract
Birds are arguably the most evolutionarily successful extant vertebrate taxon, in part because of their ability to reproduce in virtually all terrestrial habitats. Common guillemots, Uria aalge, incubate their single egg in an unusual and harsh environment; on exposed cliff ledges, without a nest, and in close proximity to conspecifics. As a consequence, the surface of guillemot eggshells is frequently contaminated with faeces, dirt, water and other detritus, which may impede gas exchange or facilitate microbial infection of the developing embryo. Despite this, guillemot chicks survive incubation and hatch from eggs heavily covered with debris. To establish how guillemot eggs cope with external debris, we tested three hypotheses: (1) contamination by debris does not reduce gas exchange efficacy of the eggshell to a degree that may impede normal embryo development; (2) the guillemot eggshell surface is self-cleaning; and, (3) shell accessory material (SAM) prevents debris from blocking pores, allowing relatively unrestricted gas diffusion across the eggshell. We show that (1) natural debris reduces the conductance of gases across the guillemot eggshell by blocking gas exchange pores. Despite this problem, we find (2) no evidence that guillemot eggshells are self-cleaning, but instead show that (3) the presence of SAM on the eggshell surface largely prevents pore blockages from occurring. Our results demonstrate that SAM is a crucial feature of the eggshell surface in a species whose eggs are frequently in contact with debris, acting to minimise pore blockages and thus ensure a sufficient rate of gas diffusion for embryo development.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Authors. This is an author produced version of a paper subsequently published in Journal of Experimental Biology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Common murre; Faeces; Eggshell; Gas conductance; Incubation; Embryo development |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Biosciences (Sheffield) > Department of Animal and Plant Sciences (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 24 Oct 2018 09:45 |
Last Modified: | 08 May 2024 15:28 |
Status: | Published |
Publisher: | Company of Biologists |
Refereed: | Yes |
Identification Number: | 10.1242/jeb.188466 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:137523 |