Abstract
The ability to discriminate between more dangerous and less dangerous predators can have serious fitness advantages for fish juveniles. This is especially true for hatchery-reared fish young used for stocking, because their post-release mortality is often much higher than that of wild-born conspecifics. We tested whether two coexisting fish predators and their different diets induce innate behavioral responses in predator-naive Arctic charr (Salvelinus alpinus) young originating from an endangered hatchery-bred population used for re-introductions. We predicted the antipredator responses of charr to be stronger towards chemical cues of brown trout (Salmo trutta) and pikeperch (Stizostedion lucioperca) than towards odorless control water. More pronounced antipredator behavior was predicted in treatments with predators fed on charr than when their diet consisted of another sympatric salmonid, European grayling (Thymallus thymallus), or when they were food-deprived. The Arctic charr young showed strong antipredator responses in all brown trout treatments, whereas odors of the less likely predator pikeperch were avoided with conspecific diet only. Freezing was the most sensitive antipredator behavior, as it was completely absent in control treatments. We found considerable individual variation in the amount and strength of antipredator responses. Although almost half of the charr failed to show antipredator behavior towards the piscivores, those with the innate ability showed highly sensitive recognition of predator odors. Our results indicate that the innate antipredator behavior of the juvenile fish is already finely tuned to respond specifically to chemical cues from different fish predators and even their diets.
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Acknowledgements
We thank M. Saastamoinen for assisting in the observations, and N. Peuhkuri, A. Salonen, K. Enberg and K. Lahti for discussion. Dr. P.H. Enckell is acknowledged for reading an earlier draft. A special thanks goes to Saimaa Fisheries Research and Aquaculture for the facilities and fish. The Academy of Finland and the Nordic Council of Ministers funded the study.
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Vilhunen, S., Hirvonen, H. Innate antipredator responses of Arctic charr (Salvelinus alpinus) depend on predator species and their diet. Behav Ecol Sociobiol 55, 1–10 (2003). https://doi.org/10.1007/s00265-003-0670-8
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DOI: https://doi.org/10.1007/s00265-003-0670-8