Abstract
The supposition that prey animals respond to a predator with an intensity that matches the risk posed by the predator is known as the threat-sensitive predator avoidance hypothesis. Many studies have provided support for this hypothesis; yet, few studies have attempted to determine how such abilities are acquired by prey species. In this study, we investigated whether fathead minnows (Pimephales promelas) could learn to recognize an unknown predator (northern pike, Esox lucius) in such a way that they could match the intensity of their antipredator response with the threat posed by the predator. We exposed pike-naïve minnows to conspecific alarm cues paired with either a high or low concentration of pike odor. The following day, both groups were tested for a response to either high or low concentration of pike odor alone. We found that minnows conditioned with alarm cues paired with a given concentration of pike odor subsequently responded with a higher intensity to higher concentrations of pike odor, and with a lower intensity to lower concentrations of pike odor. These results demonstrate that during a single conditioning trial, minnows learn the identity of the predator in a threat-sensitive manner. Minnows use predator odor concentrations that they experience in subsequent interactions to adjust the intensity of their antipredator behavior.
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Acknowledgements
This work is dedicated to the memory of Dr. Joseph A. Brown who passed away unexpectedly on September 4, 2005. Dr. Brown was a pioneer in fish behavioral ecology. His contribution to science will be sorely missed.
The Natural Sciences and Engineering Research Council of Canada and the University of Saskatchewan provided financial support to D. P. Chivers. All work reported herein was in accordance with the University of Saskatchewan Committee of Animal Care and Supply protocol #19920077.
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Communicated by K. Lindström
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Ferrari, M.C.O., Capitania-Kwok, T. & Chivers, D.P. The role of learning in the acquisition of threat-sensitive responses to predator odours. Behav Ecol Sociobiol 60, 522–527 (2006). https://doi.org/10.1007/s00265-006-0195-z
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DOI: https://doi.org/10.1007/s00265-006-0195-z