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Presence of DNA from Chlamydia-like organisms in the nasal cavities of grey seal pups (Halichoerus grypus) and three different substrates present in a breeding colony

Dagleish, Mark P.; Flockhart, Allen F.; Baily, Johanna L.; Hall, Ailsa J.; Simpson, T. Ian; Longbottom, David

Authors

Mark P. Dagleish

Johanna L. Baily

Ailsa J. Hall

T. Ian Simpson

David Longbottom



Abstract

Background
Chlamydia-like organisms (CLO) have been found to be present in many environmental niches, including human sewage and agricultural run-off, as well as in a number of aquatic species worldwide. Therefore, monitoring their presence in sentinel wildlife species may be useful in assessing the wider health of marine food webs in response to habitat loss, pollution and disease. We used nasal swabs from live (n = 42) and dead (n = 50) pre-weaned grey seal pups and samples of differing natal substrates (n = 8) from an off-shore island devoid of livestock and permanent human habitation to determine if CLO DNA is present in these mammals and to identify possible sources.

Results
We recovered CLO DNA from 32/92 (34.7%) nasal swabs from both live (n = 17) and dead (n = 15) seal pups that clustered most closely with currently recognised species belonging to three chlamydial families: Parachlamydiaceae (n = 22), Rhabdochlamydiaceae (n = 6), and Simkaniaceae (n = 3). All DNA positive sediment samples (n = 7) clustered with the Rhabdochlamydiaceae. No difference was found in rates of recovery of CLO DNA in live versus dead pups suggesting the organisms are commensal but their potential as opportunistic secondary pathogens could not be determined.

Conclusion
This is the first report of CLO DNA being found in marine mammals. This identification warrants further investigation in other seal populations around the coast of the UK and in other areas of the world to determine if this finding is unique or more common than shown by this data. Further investigation would also be warranted to determine if they are present as purely commensal organisms or whether they could also be opportunistic pathogens in seals, as well as to investigate possible sources of origin, including whether they originated as a result of anthropogenic impacts, including human waste and agricultural run-off.

Citation

Dagleish, M. P., Flockhart, A. F., Baily, J. L., Hall, A. J., Simpson, T. I., & Longbottom, D. (2021). Presence of DNA from Chlamydia-like organisms in the nasal cavities of grey seal pups (Halichoerus grypus) and three different substrates present in a breeding colony. BMC Veterinary Research, 17(1), Article 328. https://doi.org/10.1186/s12917-021-03032-3

Journal Article Type Article
Acceptance Date Sep 27, 2021
Online Publication Date Oct 13, 2021
Publication Date 2021-12
Deposit Date Oct 28, 2021
Publicly Available Date Mar 28, 2024
Journal BMC Veterinary Research
Publisher BMC
Peer Reviewed Peer Reviewed
Volume 17
Issue 1
Article Number 328
DOI https://doi.org/10.1186/s12917-021-03032-3
Keywords Chlamydia-like organisms, Parachlamydiaceae, Rhabdochlamydiaceae, Simkaniaceae, sentinel species, coastal reservoir
Public URL http://researchrepository.napier.ac.uk/Output/2816905

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Presence of DNA from Chlamydia-like organisms in the nasal cavities of grey seal pups (Halichoerus grypus) and three different substrates present in a breeding colony (1.7 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/




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