Abstract
Snakes detect and recognize prey through chemoreception using their tongue, but can they also detect toxins secreted by prey? Taste-rejection has been described in predators as a means of sampling prey for toxicity prior to ingestion but at the cost of minor intoxication and energy expenditure. Toxin detection prior to attack of prey might reduce these costs. Thamnophis sirtalis (common garter snake) is among the predators that have been shown to employ taste-rejection of toxic prey but, as with all snakes, they primarily use vomeronasal chemoreception to evaluate potential prey. We investigated whether T. sirtalis use chemoreception as means of perceiving tetrodotoxin (TTX) found in their newt prey. We used the common tongue-flick behavioral assay to evaluate response to TTX and found that naïve T. sirtalis did not respond differently to the toxin than a control. We conclude that T. sirtalis cannot detect TTX by chemoreception, or do not alter their behavior if they do.
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Acknowledgments
The authors would like to thank John Chuckalovcak, Charles Hanifin, and Shana Geffeney for helpful advice on this project. They would also like to thank the Brodie Lab and the graduate student writing group for helpful comments on earlier drafts of this manuscript. Comments from two anonymous reviewers on an earlier version of this manuscript were very helpful. They are most grateful to the Mountain Lake Biological Station, University of Virginia for allowing them to obtain animals from their site and to the University of Virginia for allowing them space to maintain the animals as well as approving the protocols necessary to conduct this research. This investigation was approved by the ACUC (protocol #3567 08 09) and the Institutional Biosafety Committee (protocol #405-06). Funding for this research was provided by the National Science Foundation (NSF-DEB 0922216 to EDBIII).
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Avila, L.A., Wiggins, R., Brodie, E.D. et al. Garter snakes do not respond to TTX via chemoreception. Chemoecology 22, 263–268 (2012). https://doi.org/10.1007/s00049-011-0094-2
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DOI: https://doi.org/10.1007/s00049-011-0094-2