Abstract
Background
The gut microbiota is an emerging frontier in wildlife research and its importance to vertebrate health and physiology is becoming ever more apparent. Reptiles, in particular snakes, have not received the same attention given to other vertebrates and the composition of their wild gut microbiome remains understudied. The primary goal of this work was to describe the cloacal microbiota of two Colubrids, the Eastern Gartersnake (Thamnophis sirtalis sirtalis) and the Northern Watersnake (Nerodia sipedon sipedon), and if their cloacal microbiota differed as well as if it did between a wetland and upland population of the former species.
Methods and results
We utilized next-generation sequencing of cloacal swabs—a non-destructive proxy for the gut microbiota. The cloacal microbiome of Eastern Gartersnakes (N = 9) was like those of other snakes being comprised of Proteobacteria, Bacteroidetes, and Firmicutes, while that of Northern Watersnakes (N = 6) was dominated by Tenericutes. Seven microbial operational taxonomic units (OTUs), all members of Proteobacteria, were shared among all individuals and were indicative of a core microbiome in Eastern Gartersnakes, but these OTUs were not particularly relevant to Northern Watersnakes. The latter had greater OTU richness than did Eastern Gartersnakes, and habitat did not have any apparent effect on the microbial community composition in Eastern Gartersnakes.
Conclusions
Our findings suggest host taxonomy to be a determining factor in the cloacal microbiota of snakes and that Tenericutes are associated with aquatic habitats. This is the first report to examine the cloacal microbiome of these species and provides a useful foundation for future work to build upon.
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Data availability
Cloacal microbiota data is available in online resource.
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Acknowledgements
We would like to thank Powdermill Nature Reserve for maintenance of the study locations and Ayana Scott-Elliston for assistance with microbial DNA extraction. Funding for this research was provided through a Southern Illinois University–Carbondale (SIUC) start-up grant to R.W.W.
Funding
Funding for this research was provided through a Southern Illinois University–Carbondale (SIUC) start-up grant to R.W.W.
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Conceptualization: JD, RW; Methodology: JD, LZ, RW; Formal Analysis and Investigation: JD and LZ; Writing—original draft preparation: JD; Writing—reviewing and editing: JD, WM, RW; Funding acquisitions: RW; Resources: WM; LZ, RW; Supervision: WM; LZ, RW.
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Animals were handled under Pennsylvania Fish and Boat Permit 02–0119 and under Southern Illinois Institutional Animal Use and Care Permit 21–016.
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Dallas, J.W., Meshaka, W.E., Zeglin, L. et al. Taxonomy, not locality, influences the cloacal microbiota of two nearctic colubrids: a preliminary analysis. Mol Biol Rep 48, 6435–6442 (2021). https://doi.org/10.1007/s11033-021-06645-x
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DOI: https://doi.org/10.1007/s11033-021-06645-x