Abstract
The Barton Springs Salamander, Eurycea sosorum, is a fully aquatic salamander found in Barton Springs in Texas, USA, and has benefited from habitat restoration efforts. While important to improve overall habitat quality for this imperiled species, current management and restoration practices may also inadvertently increase the abundance of non-target organisms such as predatory invertebrates. Fish represent major predators of this species, but little is known about the role of invertebrates as potential predators. It is important to understand the role of these aquatic invertebrates as predators of E. sosorum, especially if habitat restoration also increases predator abundance. Using adult, predator-naïve salamanders, we examined the antipredator response of E. sosorum to chemical cues from the following treatments: crayfish, dragonfly larvae, snails, and water. Salamanders decreased activity (antipredator behavior) only in response to the crayfish treatment. The responses to dragonfly larvae, snails, and water did not differ, suggesting that dragonfly larvae are not perceived as predators by these salamanders. Our study provides preliminary evidence suggesting that habitat restoration has unexpectedly increased crayfish abundance, which in turn may negatively affect E. sosorum, and that future management strategies should consider crayfish removal if salamander abundances decline with increasing crayfish abundance.
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Acknowledgements
We thank T. Brandt, J. Fries, V. Cantu, and the San Marcos Aquatic Resources Center (SMARC) for logistical support and use of both facilities and experimental animals. We also thank the City of Austin and L. Colucci for generously providing permission to use photographs, N. Bendik for providing crayfish abundance data, K. Pitcher for helpful discussion on invertebrates, and M. Dixon for statistical advice. Funding for this study was provided by the Texas Academy of Science and the Texas State University Undergraduate Research Initiative. Helpful comments on this manuscript were provided by J. Farkas, the GrEBE Discussion Group at the University of South Dakota, and two anonymous reviewers. This experiment was conducted under an approved Texas State University IACUC protocol (#01-039-028) and permits for captive salamanders are maintained by the SMARC (TPWD SPR-0390-045; USFWS TE676811-2).
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Davis, D.R., DeSantis, D.L. & Gabor, C.R. Antipredator behavior of the Barton Springs salamander (Eurycea sosorum) in response to aquatic invertebrates: potential consequences of habitat restoration. Hydrobiologia 795, 129–137 (2017). https://doi.org/10.1007/s10750-017-3124-4
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DOI: https://doi.org/10.1007/s10750-017-3124-4