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    Prey Responses to Predator Chemical Cues: Disentangling the Importance of the Number and Biomass of Prey Consumed

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    Author
    McCoy, Michael W.; Touchon, Justin C.; Landberg, Tobias; Warkentin, Karen M.; Vonesh, James R.
    Abstract
    To effectively balance investment in predator defenses versus other traits, organisms must accurately assess predation risk. Chemical cues caused by predation events are indicators of risk for prey in a wide variety of systems, but the relationship between how prey perceive risk in relation to the amount of prey consumed by predators is poorly understood. While per capita predation rate is often used as the metric of relative risk, studies aimed at quantifying predator-induced defenses commonly control biomass of prey consumed as the metric of risk. However, biomass consumed can change by altering either the number or size of prey consumed. In this study we determine whether phenotypic plasticity to predator chemical cues depends upon prey biomass consumed, prey number consumed, or both. We examine the growth response of red-eyed treefrog tadpoles (Agalychnis callidryas) to cues from a larval dragonfly (Anax amazili). Biomass consumed was manipulated by either increasing the number of prey while holding individual prey size constant, or by holding the number of prey constant and varying individual prey size. We address two questions. (i) Do prey reduce growth rate in response to chemical cues in a dose dependent manner? (ii) Does the magnitude of the response depend on whether prey consumption increases via number or size of prey? We find that the phenotypic response of prey is an asymptotic function of prey biomass consumed. However, the asymptotic response is higher when more prey are consumed. Our findings have important implications for evaluating past studies and how future experiments should be designed. A stronger response to predation cues generated by more individual prey deaths is consistent with models that predict prey sensitivity to per capita risk, providing a more direct link between empirical and theoretical studies which are often focused on changes in population sizes not individual biomass.
    URI
    http://hdl.handle.net/10342/5479
    Subject
     Predation; Tadpoles; Biomass (ecology); Phenotypes; Food web structure; Ponds; Mesocosms 
    Date
    2012
    Citation:
    APA:
    McCoy, Michael W., & Touchon, Justin C., & Landberg, Tobias, & Warkentin, Karen M., & Vonesh, James R.. (January 2012). Prey Responses to Predator Chemical Cues: Disentangling the Importance of the Number and Biomass of Prey Consumed. PLoS ONE, (7:10), p.1-5. Retrieved from http://hdl.handle.net/10342/5479

    Display/Hide MLA, Chicago and APA citation formats.

    MLA:
    McCoy, Michael W., and Touchon, Justin C., and Landberg, Tobias, and Warkentin, Karen M., and Vonesh, James R.. "Prey Responses to Predator Chemical Cues: Disentangling the Importance of the Number and Biomass of Prey Consumed". PLoS ONE. 7:10. (1-5.), January 2012. August 10, 2022. http://hdl.handle.net/10342/5479.
    Chicago:
    McCoy, Michael W. and Touchon, Justin C. and Landberg, Tobias and Warkentin, Karen M. and Vonesh, James R., "Prey Responses to Predator Chemical Cues: Disentangling the Importance of the Number and Biomass of Prey Consumed," PLoS ONE 7, no. 10 (January 2012), http://hdl.handle.net/10342/5479 (accessed August 10, 2022).
    AMA:
    McCoy, Michael W., Touchon, Justin C., Landberg, Tobias, Warkentin, Karen M., Vonesh, James R.. Prey Responses to Predator Chemical Cues: Disentangling the Importance of the Number and Biomass of Prey Consumed. PLoS ONE. January 2012; 7(10) 1-5. http://hdl.handle.net/10342/5479. Accessed August 10, 2022.
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