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Non-native silver carp fail to generalize behavior when exposed to odors from three North American predators

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Abstract

Predator-prey interactions exert significant influence over the survival of juvenile fish cohorts. Therefore, susceptibility of a habitat to invasion is influenced by the capacity of native predators to regulate invasive species through consumption. Closely related predators often share similar characteristics (e.g., odors or body morphometry), and prey species capable of expressing generalized behavioral responses to predators with similar characteristics may increase their chances for survival. Here, we examined how naïve juvenile silver carp (Hypophthalmichthys molitrix), an invasive Asian carp, respond to three predator odors from predators commonly found in Midwestern lakes and rivers of the USA. We tested two congeneric species of bass (largemouth Micropterus salmoides and smallmouth M. dolomieu bass) and one outgroup, longnose gar (Lepisosteus osseus). Additionally, we tested how silver carp conditioned to recognize the odor of one group, largemouth bass, responded to the predator odors of the congeneric species and the outgroup. We found that juvenile silver carp showed no innate response to any of the three predator odors. Additionally, although they could be conditioned to recognize predator odors from largemouth bass, they were unable to generalize predator odors to smallmouth bass or longnose gar odor. These results suggest that invasive species could be less likely to persist in environments with diverse predator communities than environments of equal densities with uniform predator communities and that future studies should continue to explore this area as well as focus on understanding dynamics in predator-prey interactions of invasive species.

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Funding

The study was supported in part by funding from the Great Lakes Research Initiative, administered through the Illinois Department of Natural Resources (CAFWS-93).

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All authors contributed to development of concept and study design. JCW carried out experiments. JCW and TMD analyzed data. JCW developed initial manuscript, and all authors provided scientific input and contributed to editing and revision of the manuscript.

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Correspondence to Thomas M. Detmer.

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Institutional Animal Care and Use Committee (#14069) approval was obtained before commencement of the study. All fishes were acquired, retained, and used in compliance with federal, state, and local laws and regulations.

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The authors declare no competing interests.

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Jared C. Wilson and Thomas M. Detmer co-lead authors.

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Wilson, J.C., Detmer, T.M., White, D. et al. Non-native silver carp fail to generalize behavior when exposed to odors from three North American predators. Environ Biol Fish 104, 1033–1043 (2021). https://doi.org/10.1007/s10641-021-01124-5

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  • DOI: https://doi.org/10.1007/s10641-021-01124-5

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