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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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    Area of Science:

    • Animal Behavior
    • Chemical Ecology
    • Marine Biology

    Background:

    • Predators often alternate between active searching and resting periods.
    • Understanding how activity influences sensory perception is key to predator-prey dynamics.

    Purpose of the Study:

    • To investigate the impact of activity state on behavioral responses to prey odor in blue crabs and spiny lobsters.
    • To determine if chemical stimuli initiate foraging or modulate ongoing searching behavior.

    Main Methods:

    • Experiments were conducted on blue crabs (Callinectes sapidus) and spiny lobsters (Panulirus interruptus) in outdoor seawater tanks.
    • Animals were exposed to prey odor or a purified attractant (ATP) during spontaneous walking or resting periods.
    • Behavioral responses were quantified, including turning towards the odor source and substrate probing.

    Main Results:

    • Only walking animals exhibited significant behavioral responses to prey odor.
    • The purified attractant ATP was 498 times more potent in evoking responses from walking lobsters compared to resting ones.
    • Rest period duration or timing did not affect the sensitivity of the behavioral response.

    Conclusions:

    • Chemical stimuli primarily modulate searching behavior in already aroused predators, rather than initiating foraging from a quiescent state.
    • Experimental setups that restrict natural activity may overestimate the concentrations of chemical cues needed to elicit responses in free-ranging animals.